Merge git://git.kernel.org/pub/scm/linux/kernel/git/gregkh/tty-2.6

* git://git.kernel.org/pub/scm/linux/kernel/git/gregkh/tty-2.6: (58 commits)
  tty: split the lock up a bit further
  tty: Move the leader test in disassociate
  tty: Push the bkl down a bit in the hangup code
  tty: Push the lock down further into the ldisc code
  tty: push the BKL down into the handlers a bit
  tty: moxa: split open lock
  tty: moxa: Kill the use of lock_kernel
  tty: moxa: Fix modem op locking
  tty: moxa: Kill off the throttle method
  tty: moxa: Locking clean up
  tty: moxa: rework the locking a bit
  tty: moxa: Use more tty_port ops
  tty: isicom: fix deadlock on shutdown
  tty: mxser: Use the new locking rules to fix setserial properly
  tty: mxser: use the tty_port_open method
  tty: isicom: sort out the board init logic
  tty: isicom: switch to the new tty_port_open helper
  tty: tty_port: Add a kref object to the tty port
  tty: istallion: tty port open/close methods
  tty: stallion: Convert to the tty_port_open/close methods
  ...

Documentation/serial/hayes-esp.txt

-HAYES ESP DRIVER VERSION 2.1
-
-A big thanks to the people at Hayes, especially Alan Adamson.  Their support
-has enabled me to provide enhancements to the driver.
-
-Please report your experiences with this driver to me (arobinso@nyx.net).  I
-am looking for both positive and negative feedback.
-
-*** IMPORTANT CHANGES FOR 2.1 ***
-Support for PIO mode.  Five situations will cause PIO mode to be used:
-1) A multiport card is detected.  PIO mode will always be used.  (8 port cards
-do not support DMA).
-2) The DMA channel is set to an invalid value (anything other than 1 or 3).
-3) The DMA buffer/channel could not be allocated.  The port will revert to PIO
-mode until it is reopened.
-4) Less than a specified number of bytes need to be transferred to/from the
-FIFOs.  PIO mode will be used for that transfer only.
-5) A port needs to do a DMA transfer and another port is already using the
-DMA channel.  PIO mode will be used for that transfer only.
-
-Since the Hayes ESP seems to conflict with other cards (notably sound cards)
-when using DMA, DMA is turned off by default.  To use DMA, it must be turned
-on explicitly, either with the "dma=" option described below or with
-setserial.  A multiport card can be forced into DMA mode by using setserial;
-however, most multiport cards don't support DMA.
-
-The latest version of setserial allows the enhanced configuration of the ESP
-card to be viewed and modified.
-***
-
-This package contains the files needed to compile a module to support the Hayes
-ESP card.  The drivers are basically a modified version of the serial drivers.
-
-Features:
-
-- Uses the enhanced mode of the ESP card, allowing a wider range of
-  interrupts and features than compatibility mode
-- Uses DMA and 16 bit PIO mode to transfer data to and from the ESP's FIFOs,
-  reducing CPU load
-- Supports primary and secondary ports
-
-
-If the driver is compiled as a module, the IRQs to use can be specified by
-using the irq= option.  The format is:
-
-irq=[0x100],[0x140],[0x180],[0x200],[0x240],[0x280],[0x300],[0x380]
-
-The address in brackets is the base address of the card.  The IRQ of
-nonexistent cards can be set to 0.  If an IRQ of a card that does exist is set
-to 0, the driver will attempt to guess at the correct IRQ.  For example, to set
-the IRQ of the card at address 0x300 to 12, the insmod command would be:
-
-insmod esp irq=0,0,0,0,0,0,12,0
-
-The custom divisor can be set by using the divisor= option.  The format is the
-same as for the irq= option.  Each divisor value is a series of hex digits,
-with each digit representing the divisor to use for a corresponding port.  The
-divisor value is constructed RIGHT TO LEFT.  Specifying a nonzero divisor value
-will automatically set the spd_cust flag.  To calculate the divisor to use for
-a certain baud rate, divide the port's base baud (generally 921600) by the
-desired rate.  For example, to set the divisor of the primary port at 0x300 to
-4 and the divisor of the secondary port at 0x308 to 8, the insmod command would
-be:
-
-insmod esp divisor=0,0,0,0,0,0,0x84,0
-
-The dma= option can be used to set the DMA channel.  The channel can be either
-1 or 3.  Specifying any other value will force the driver to use PIO mode.
-For example, to set the DMA channel to 3, the insmod command would be:
-
-insmod esp dma=3
-
-The rx_trigger= and tx_trigger= options can be used to set the FIFO trigger
-levels.  They specify when the ESP card should send an interrupt.  Larger
-values will decrease the number of interrupts; however, a value too high may
-result in data loss.  Valid values are 1 through 1023, with 768 being the
-default.  For example, to set the receive trigger level to 512 bytes and the
-transmit trigger level to 700 bytes, the insmod command would be:
-
-insmod esp rx_trigger=512 tx_trigger=700
-
-The flow_off= and flow_on= options can be used to set the hardware flow off/
-flow on levels.  The flow on level must be lower than the flow off level, and
-the flow off level should be higher than rx_trigger.  Valid values are 1
-through 1023, with 1016 being the default flow off level and 944 being the
-default flow on level.  For example, to set the flow off level to 1000 bytes
-and the flow on level to 935 bytes, the insmod command would be:
-
-insmod esp flow_off=1000 flow_on=935
-
-The rx_timeout= option can be used to set the receive timeout value.  This
-value indicates how long after receiving the last character that the ESP card
-should wait before signalling an interrupt.  Valid values are 0 though 255,
-with 128 being the default.  A value too high will increase latency, and a
-value too low will cause unnecessary interrupts.  For example, to set the
-receive timeout to 255, the insmod command would be:
-
-insmod esp rx_timeout=255
-
-The pio_threshold= option sets the threshold (in number of characters) for
-using PIO mode instead of DMA mode.  For example, if this value is 32,
-transfers of 32 bytes or less will always use PIO mode.
-
-insmod esp pio_threshold=32
-
-Multiple options can be listed on the insmod command line by separating each
-option with a space.  For example:
-
-insmod esp dma=3 trigger=512
-
-The esp module can be automatically loaded when needed.  To cause this to
-happen, add the following lines to /etc/modprobe.conf (replacing the last line
-with options for your configuration):
-
-alias char-major-57 esp
-alias char-major-58 esp
-options esp irq=0,0,0,0,0,0,3,0 divisor=0,0,0,0,0,0,0x4,0
-
-You may also need to run 'depmod -a'.
-
-Devices must be created manually.  To create the devices, note the output from
-the module after it is inserted.  The output will appear in the location where
-kernel messages usually appear (usually /var/adm/messages).  Create two devices
-for each 'tty' mentioned, one with major of 57 and the other with major of 58.
-The minor number should be the same as the tty number reported.  The commands
-would be (replace ? with the tty number):
-
-mknod /dev/ttyP? c 57 ?
-mknod /dev/cup? c 58 ?
-
-For example, if the following line appears:
-
-Oct 24 18:17:23 techno kernel: ttyP8 at 0x0140 (irq = 3) is an ESP primary port
-
-...two devices should be created:
-
-mknod /dev/ttyP8 c 57 8
-mknod /dev/cup8 c 58 8
-
-You may need to set the permissions on the devices:
-
-chmod 666 /dev/ttyP*
-chmod 666 /dev/cup*
-
-The ESP module and the serial module should not conflict (they can be used at
-the same time).  After the ESP module has been loaded the ports on the ESP card
-will no longer be accessible by the serial driver.
-
-If I/O errors are experienced when accessing the port, check for IRQ and DMA
-conflicts ('cat /proc/interrupts' and 'cat /proc/dma' for a list of IRQs and
-DMAs currently in use).
-
-Enjoy!
-Andrew J. Robinson <arobinso@nyx.net>

Documentation/serial/tty.txt

@@ -42,7 +42,8 @@ TTY side interfaces:
 open()		-	Called when the line discipline is attached to
 			the terminal. No other call into the line
 			discipline for this tty will occur until it
-			completes successfully. Can sleep.
+			completes successfully. Returning an error will
+			prevent the ldisc from being attached. Can sleep.
 
 close()		-	This is called on a terminal when the line
 			discipline is being unplugged. At the point of
@@ -52,7 +53,7 @@ close()		-	This is called on a terminal when the line
 hangup()	-	Called when the tty line is hung up.
 			The line discipline should cease I/O to the tty.
 			No further calls into the ldisc code will occur.
-			Can sleep.
+			The return value is ignored. Can sleep.
 
 write()		-	A process is writing data through the line
 			discipline.  Multiple write calls are serialized
@@ -83,6 +84,10 @@ ioctl()		-	Called when an ioctl is handed to the tty layer
 			that might be for the ldisc. Multiple ioctl calls
 			may occur in parallel. May sleep. 
 
+compat_ioctl()	-	Called when a 32 bit ioctl is handed to the tty layer
+			that might be for the ldisc. Multiple ioctl calls
+			may occur in parallel. May sleep.
+
 Driver Side Interfaces:
 
 receive_buf()	-	Hand buffers of bytes from the driver to the ldisc

arch/xtensa/platforms/iss/console.c

@@ -196,7 +196,7 @@ static const struct file_operations rs_proc_fops = {
 	.release	= single_release,
 };
 
-static struct tty_operations serial_ops = {
+static const struct tty_operations serial_ops = {
 	.open = rs_open,
 	.close = rs_close,
 	.write = rs_write,

drivers/char/Kconfig

@@ -201,19 +201,6 @@ config DIGIEPCA
 	  To compile this driver as a module, choose M here: the
 	  module will be called epca.
 
-config ESPSERIAL
-	tristate "Hayes ESP serial port support"
-	depends on SERIAL_NONSTANDARD && ISA && ISA_DMA_API && BROKEN
-	help
-	  This is a driver which supports Hayes ESP serial ports.  Both single
-	  port cards and multiport cards are supported.  Make sure to read
-	  <file:Documentation/hayes-esp.txt>.
-
-	  To compile this driver as a module, choose M here: the
-	  module will be called esp.
-
-	  If unsure, say N.
-
 config MOXA_INTELLIO
 	tristate "Moxa Intellio support"
 	depends on SERIAL_NONSTANDARD && (ISA || EISA || PCI)

drivers/char/Makefile

@@ -18,7 +18,6 @@ obj-$(CONFIG_CONSOLE_TRANSLATIONS) += consolemap.o consolemap_deftbl.o
 obj-$(CONFIG_HW_CONSOLE)	+= vt.o defkeymap.o
 obj-$(CONFIG_AUDIT)		+= tty_audit.o
 obj-$(CONFIG_MAGIC_SYSRQ)	+= sysrq.o
-obj-$(CONFIG_ESPSERIAL)		+= esp.o
 obj-$(CONFIG_MVME147_SCC)	+= generic_serial.o vme_scc.o
 obj-$(CONFIG_MVME162_SCC)	+= generic_serial.o vme_scc.o
 obj-$(CONFIG_BVME6000_SCC)	+= generic_serial.o vme_scc.o

drivers/char/bfin_jtag_comm.c

@@ -226,7 +226,7 @@ bfin_jc_wait_until_sent(struct tty_struct *tty, int timeout)
 	}
 }
 
-static struct tty_operations bfin_jc_ops = {
+static const struct tty_operations bfin_jc_ops = {
 	.open            = bfin_jc_open,
 	.close           = bfin_jc_close,
 	.write           = bfin_jc_write,

drivers/char/epca.c

@@ -935,7 +935,7 @@ static int info_open(struct tty_struct *tty, struct file *filp)
 	return 0;
 }
 
-static struct tty_operations info_ops = {
+static const struct tty_operations info_ops = {
 	.open = info_open,
 	.ioctl = info_ioctl,
 };

drivers/char/isicom.c

@@ -793,35 +793,30 @@ static inline void isicom_setup_board(struct isi_board *bp)
 {
 	int channel;
 	struct isi_port *port;
-	unsigned long flags;
 
-	spin_lock_irqsave(&bp->card_lock, flags);
-	if (bp->status & BOARD_ACTIVE) {
-		spin_unlock_irqrestore(&bp->card_lock, flags);
-		return;
+	bp->count++;
+	if (!(bp->status & BOARD_INIT)) {
+		port = bp->ports;
+		for (channel = 0; channel < bp->port_count; channel++, port++)
+			drop_dtr_rts(port);
 	}
-	port = bp->ports;
-	bp->status |= BOARD_ACTIVE;
-	for (channel = 0; channel < bp->port_count; channel++, port++)
-		drop_dtr_rts(port);
-	spin_unlock_irqrestore(&bp->card_lock, flags);
+	bp->status |= BOARD_ACTIVE | BOARD_INIT;
 }
 
-static int isicom_setup_port(struct tty_struct *tty)
+/* Activate and thus setup board are protected from races against shutdown
+   by the tty_port mutex */
+
+static int isicom_activate(struct tty_port *tport, struct tty_struct *tty)
 {
-	struct isi_port *port = tty->driver_data;
+	struct isi_port *port = container_of(tport, struct isi_port, port);
 	struct isi_board *card = port->card;
 	unsigned long flags;
 
-	if (port->port.flags & ASYNC_INITIALIZED)
-		return 0;
-	if (tty_port_alloc_xmit_buf(&port->port) < 0)
+	if (tty_port_alloc_xmit_buf(tport) < 0)
 		return -ENOMEM;
 
 	spin_lock_irqsave(&card->card_lock, flags);
-	clear_bit(TTY_IO_ERROR, &tty->flags);
-	if (port->port.count == 1)
-		card->count++;
+	isicom_setup_board(card);
 
 	port->xmit_cnt = port->xmit_head = port->xmit_tail = 0;
 
@@ -832,9 +827,7 @@ static int isicom_setup_port(struct tty_struct *tty)
 		outw(((ISICOM_KILLTX | ISICOM_KILLRX) << 8) | 0x06, card->base);
 		InterruptTheCard(card->base);
 	}
-
 	isicom_config_port(tty);
-	port->port.flags |= ASYNC_INITIALIZED;
 	spin_unlock_irqrestore(&card->card_lock, flags);
 
 	return 0;
@@ -871,85 +864,37 @@ static struct tty_port *isicom_find_port(struct tty_struct *tty)
 
 	return &port->port;
 }
-	
+
 static int isicom_open(struct tty_struct *tty, struct file *filp)
 {
 	struct isi_port *port;
 	struct isi_board *card;
 	struct tty_port *tport;
-	int error = 0;
 
 	tport = isicom_find_port(tty);
 	if (tport == NULL)
 		return -ENODEV;
 	port = container_of(tport, struct isi_port, port);
 	card = &isi_card[BOARD(tty->index)];
-	isicom_setup_board(card);
 
-	/* FIXME: locking on port.count etc */
-	port->port.count++;
-	tty->driver_data = port;
-	tty_port_tty_set(&port->port, tty);
-	/* FIXME: Locking on Initialized flag */
-	if (!test_bit(ASYNCB_INITIALIZED, &tport->flags))
-		error = isicom_setup_port(tty);
-	if (error == 0)
-		error = tty_port_block_til_ready(&port->port, tty, filp);
-	return error;
+	return tty_port_open(tport, tty, filp);
 }
 
 /* close et all */
 
-static inline void isicom_shutdown_board(struct isi_board *bp)
-{
-	if (bp->status & BOARD_ACTIVE)
-		bp->status &= ~BOARD_ACTIVE;
-}
-
 /* card->lock HAS to be held */
 static void isicom_shutdown_port(struct isi_port *port)
 {
 	struct isi_board *card = port->card;
-	struct tty_struct *tty;
-
-	tty = tty_port_tty_get(&port->port);
-
-	if (!(port->port.flags & ASYNC_INITIALIZED)) {
-		tty_kref_put(tty);
-		return;
-	}
-
-	tty_port_free_xmit_buf(&port->port);
-	port->port.flags &= ~ASYNC_INITIALIZED;
-	/* 3rd October 2000 : Vinayak P Risbud */
-	tty_port_tty_set(&port->port, NULL);
-
-	/*Fix done by Anil .S on 30-04-2001
-	remote login through isi port has dtr toggle problem
-	due to which the carrier drops before the password prompt
-	appears on the remote end. Now we drop the dtr only if the
-	HUPCL(Hangup on close) flag is set for the tty*/
-
-	if (C_HUPCL(tty))
-		/* drop dtr on this port */
-		drop_dtr(port);
-
-	/* any other port uninits  */
-	if (tty)
-		set_bit(TTY_IO_ERROR, &tty->flags);
 
 	if (--card->count < 0) {
 		pr_dbg("isicom_shutdown_port: bad board(0x%lx) count %d.\n",
 			card->base, card->count);
 		card->count = 0;
 	}
-
-	/* last port was closed, shutdown that boad too */
-	if (C_HUPCL(tty)) {
-		if (!card->count)
-			isicom_shutdown_board(card);
-	}
-	tty_kref_put(tty);
+	/* last port was closed, shutdown that board too */
+	if (!card->count)
+		card->status &= BOARD_ACTIVE;
 }
 
 static void isicom_flush_buffer(struct tty_struct *tty)
@@ -968,7 +913,7 @@ static void isicom_flush_buffer(struct tty_struct *tty)
 	tty_wakeup(tty);
 }
 
-static void isicom_close_port(struct tty_port *port)
+static void isicom_shutdown(struct tty_port *port)
 {
 	struct isi_port *ip = container_of(port, struct isi_port, port);
 	struct isi_board *card = ip->card;
@@ -977,12 +922,11 @@ static void isicom_close_port(struct tty_port *port)
 	/* indicate to the card that no more data can be received
 	   on this port */
 	spin_lock_irqsave(&card->card_lock, flags);
-	if (port->flags & ASYNC_INITIALIZED) {
-		card->port_status &= ~(1 << ip->channel);
-		outw(card->port_status, card->base + 0x02);
-	}
+	card->port_status &= ~(1 << ip->channel);
+	outw(card->port_status, card->base + 0x02);
 	isicom_shutdown_port(ip);
 	spin_unlock_irqrestore(&card->card_lock, flags);
+	tty_port_free_xmit_buf(port);
 }
 
 static void isicom_close(struct tty_struct *tty, struct file *filp)
@@ -991,12 +935,7 @@ static void isicom_close(struct tty_struct *tty, struct file *filp)
 	struct tty_port *port = &ip->port;
 	if (isicom_paranoia_check(ip, tty->name, "isicom_close"))
 		return;
-
-	if (tty_port_close_start(port, tty, filp) == 0)
-		return;
-	isicom_close_port(port);
-	isicom_flush_buffer(tty);
-	tty_port_close_end(port, tty);
+	tty_port_close(port, tty, filp);
 }
 
 /* write et all */
@@ -1326,15 +1265,9 @@ static void isicom_start(struct tty_struct *tty)
 static void isicom_hangup(struct tty_struct *tty)
 {
 	struct isi_port *port = tty->driver_data;
-	unsigned long flags;
 
 	if (isicom_paranoia_check(port, tty->name, "isicom_hangup"))
 		return;
-
-	spin_lock_irqsave(&port->card->card_lock, flags);
-	isicom_shutdown_port(port);
-	spin_unlock_irqrestore(&port->card->card_lock, flags);
-
 	tty_port_hangup(&port->port);
 }
 
@@ -1367,6 +1300,8 @@ static const struct tty_operations isicom_ops = {
 static const struct tty_port_operations isicom_port_ops = {
 	.carrier_raised		= isicom_carrier_raised,
 	.dtr_rts		= isicom_dtr_rts,
+	.activate		= isicom_activate,
+	.shutdown		= isicom_shutdown,
 };
 
 static int __devinit reset_card(struct pci_dev *pdev,

drivers/char/istallion.c

@@ -213,7 +213,6 @@ static int		stli_shared;
  *	with the slave. Most of them need to be updated atomically, so always
  *	use the bit setting operations (unless protected by cli/sti).
  */
-#define	ST_INITIALIZING	1
 #define	ST_OPENING	2
 #define	ST_CLOSING	3
 #define	ST_CMDING	4
@@ -621,7 +620,7 @@ static int	stli_brdinit(struct stlibrd *brdp);
 static int	stli_startbrd(struct stlibrd *brdp);
 static ssize_t	stli_memread(struct file *fp, char __user *buf, size_t count, loff_t *offp);
 static ssize_t	stli_memwrite(struct file *fp, const char __user *buf, size_t count, loff_t *offp);
-static int	stli_memioctl(struct inode *ip, struct file *fp, unsigned int cmd, unsigned long arg);
+static long	stli_memioctl(struct file *fp, unsigned int cmd, unsigned long arg);
 static void	stli_brdpoll(struct stlibrd *brdp, cdkhdr_t __iomem *hdrp);
 static void	stli_poll(unsigned long arg);
 static int	stli_hostcmd(struct stlibrd *brdp, struct stliport *portp);
@@ -704,7 +703,7 @@ static const struct file_operations	stli_fsiomem = {
 	.owner		= THIS_MODULE,
 	.read		= stli_memread,
 	.write		= stli_memwrite,
-	.ioctl		= stli_memioctl,
+	.unlocked_ioctl	= stli_memioctl,
 };
 
 /*****************************************************************************/
@@ -783,13 +782,32 @@ static int stli_parsebrd(struct stlconf *confp, char **argp)
 
 /*****************************************************************************/
 
+/*
+ *	On the first open of the device setup the port hardware, and
+ *	initialize the per port data structure. Since initializing the port
+ *	requires several commands to the board we will need to wait for any
+ *	other open that is already initializing the port.
+ *
+ *	Locking: protected by the port mutex.
+ */
+
+static int stli_activate(struct tty_port *port, struct tty_struct *tty)
+{
+	struct stliport *portp = container_of(port, struct stliport, port);
+	struct stlibrd *brdp = stli_brds[portp->brdnr];
+	int rc;
+
+	if ((rc = stli_initopen(tty, brdp, portp)) >= 0)
+		clear_bit(TTY_IO_ERROR, &tty->flags);
+	wake_up_interruptible(&portp->raw_wait);
+	return rc;
+}
+
 static int stli_open(struct tty_struct *tty, struct file *filp)
 {
 	struct stlibrd *brdp;
 	struct stliport *portp;
-	struct tty_port *port;
 	unsigned int minordev, brdnr, portnr;
-	int rc;
 
 	minordev = tty->index;
 	brdnr = MINOR2BRD(minordev);
@@ -809,95 +827,56 @@ static int stli_open(struct tty_struct *tty, struct file *filp)
 		return -ENODEV;
 	if (portp->devnr < 1)
 		return -ENODEV;
-	port = &portp->port;
-
-/*
- *	On the first open of the device setup the port hardware, and
- *	initialize the per port data structure. Since initializing the port
- *	requires several commands to the board we will need to wait for any
- *	other open that is already initializing the port.
- *
- *	Review - locking
- */
-	tty_port_tty_set(port, tty);
-	tty->driver_data = portp;
-	port->count++;
-
-	wait_event_interruptible(portp->raw_wait,
-			!test_bit(ST_INITIALIZING, &portp->state));
-	if (signal_pending(current))
-		return -ERESTARTSYS;
-
-	if ((portp->port.flags & ASYNC_INITIALIZED) == 0) {
-		set_bit(ST_INITIALIZING, &portp->state);
-		if ((rc = stli_initopen(tty, brdp, portp)) >= 0) {
-			/* Locking */
-			port->flags |= ASYNC_INITIALIZED;
-			clear_bit(TTY_IO_ERROR, &tty->flags);
-		}
-		clear_bit(ST_INITIALIZING, &portp->state);
-		wake_up_interruptible(&portp->raw_wait);
-		if (rc < 0)
-			return rc;
-	}
-	return tty_port_block_til_ready(&portp->port, tty, filp);
+	return tty_port_open(&portp->port, tty, filp);
 }
 
+
 /*****************************************************************************/
 
-static void stli_close(struct tty_struct *tty, struct file *filp)
+static void stli_shutdown(struct tty_port *port)
 {
 	struct stlibrd *brdp;
-	struct stliport *portp;
-	struct tty_port *port;
+	unsigned long ftype;
 	unsigned long flags;
+	struct stliport *portp = container_of(port, struct stliport, port);
 
-	portp = tty->driver_data;
-	if (portp == NULL)
+	if (portp->brdnr >= stli_nrbrds)
 		return;
-	port = &portp->port;
-
-	if (tty_port_close_start(port, tty, filp) == 0)
+	brdp = stli_brds[portp->brdnr];
+	if (brdp == NULL)
 		return;
 
-/*
- *	May want to wait for data to drain before closing. The BUSY flag
- *	keeps track of whether we are still transmitting or not. It is
- *	updated by messages from the slave - indicating when all chars
- *	really have drained.
- */
- 	spin_lock_irqsave(&stli_lock, flags);
-	if (tty == stli_txcooktty)
-		stli_flushchars(tty);
-	spin_unlock_irqrestore(&stli_lock, flags);
-
-	/* We end up doing this twice for the moment. This needs looking at
-	   eventually. Note we still use portp->closing_wait as a result */
-	if (portp->closing_wait != ASYNC_CLOSING_WAIT_NONE)
-		tty_wait_until_sent(tty, portp->closing_wait);
+	/*
+	 *	May want to wait for data to drain before closing. The BUSY
+	 *	flag keeps track of whether we are still transmitting or not.
+	 *	It is updated by messages from the slave - indicating when all
+	 *	chars really have drained.
+	 */
 
-	/* FIXME: port locking here needs attending to */
-	port->flags &= ~ASYNC_INITIALIZED;
+	if (!test_bit(ST_CLOSING, &portp->state))
+		stli_rawclose(brdp, portp, 0, 0);
 
-	brdp = stli_brds[portp->brdnr];
-	stli_rawclose(brdp, portp, 0, 0);
-	if (tty->termios->c_cflag & HUPCL) {
-		stli_mkasysigs(&portp->asig, 0, 0);
-		if (test_bit(ST_CMDING, &portp->state))
-			set_bit(ST_DOSIGS, &portp->state);
-		else
-			stli_sendcmd(brdp, portp, A_SETSIGNALS, &portp->asig,
-				sizeof(asysigs_t), 0);
-	}
+ 	spin_lock_irqsave(&stli_lock, flags);
 	clear_bit(ST_TXBUSY, &portp->state);
 	clear_bit(ST_RXSTOP, &portp->state);
-	set_bit(TTY_IO_ERROR, &tty->flags);
-	tty_ldisc_flush(tty);
-	set_bit(ST_DOFLUSHRX, &portp->state);
-	stli_flushbuffer(tty);
+	spin_unlock_irqrestore(&stli_lock, flags);
 
-	tty_port_close_end(port, tty);
-	tty_port_tty_set(port, NULL);
+	ftype = FLUSHTX | FLUSHRX;
+	stli_cmdwait(brdp, portp, A_FLUSH, &ftype, sizeof(u32), 0);
+}
+
+static void stli_close(struct tty_struct *tty, struct file *filp)
+{
+	struct stliport *portp = tty->driver_data;
+	unsigned long flags;
+	if (portp == NULL)
+		return;
+ 	spin_lock_irqsave(&stli_lock, flags);
+	/*	Flush any internal buffering out first */
+	if (tty == stli_txcooktty)
+		stli_flushchars(tty);
+	spin_unlock_irqrestore(&stli_lock, flags);
+	tty_port_close(&portp->port, tty, filp);
 }
 
 /*****************************************************************************/
@@ -1724,6 +1703,7 @@ static void stli_start(struct tty_struct *tty)
 
 /*****************************************************************************/
 
+
 /*
  *	Hangup this port. This is pretty much like closing the port, only
  *	a little more brutal. No waiting for data to drain. Shutdown the
@@ -1733,47 +1713,8 @@ static void stli_start(struct tty_struct *tty)
 
 static void stli_hangup(struct tty_struct *tty)
 {
-	struct stliport *portp;
-	struct stlibrd *brdp;
-	struct tty_port *port;
-	unsigned long flags;
-
-	portp = tty->driver_data;
-	if (portp == NULL)
-		return;
-	if (portp->brdnr >= stli_nrbrds)
-		return;
-	brdp = stli_brds[portp->brdnr];
-	if (brdp == NULL)
-		return;
-	port = &portp->port;
-
-	spin_lock_irqsave(&port->lock, flags);
-	port->flags &= ~ASYNC_INITIALIZED;
-	spin_unlock_irqrestore(&port->lock, flags);
-
-	if (!test_bit(ST_CLOSING, &portp->state))
-		stli_rawclose(brdp, portp, 0, 0);
-
-	spin_lock_irqsave(&stli_lock, flags);
-	if (tty->termios->c_cflag & HUPCL) {
-		stli_mkasysigs(&portp->asig, 0, 0);
-		if (test_bit(ST_CMDING, &portp->state)) {
-			set_bit(ST_DOSIGS, &portp->state);
-			set_bit(ST_DOFLUSHTX, &portp->state);
-			set_bit(ST_DOFLUSHRX, &portp->state);
-		} else {
-			stli_sendcmd(brdp, portp, A_SETSIGNALSF,
-				&portp->asig, sizeof(asysigs_t), 0);
-		}
-	}
-
-	clear_bit(ST_TXBUSY, &portp->state);
-	clear_bit(ST_RXSTOP, &portp->state);
-	set_bit(TTY_IO_ERROR, &tty->flags);
-	spin_unlock_irqrestore(&stli_lock, flags);
-
-	tty_port_hangup(port);
+	struct stliport *portp = tty->driver_data;
+	tty_port_hangup(&portp->port);
 }
 
 /*****************************************************************************/
@@ -4311,7 +4252,7 @@ static int stli_getbrdstruct(struct stlibrd __user *arg)
  *	reset it, and start/stop it.
  */
 
-static int stli_memioctl(struct inode *ip, struct file *fp, unsigned int cmd, unsigned long arg)
+static long stli_memioctl(struct file *fp, unsigned int cmd, unsigned long arg)
 {
 	struct stlibrd *brdp;
 	int brdnr, rc, done;
@@ -4356,7 +4297,7 @@ static int stli_memioctl(struct inode *ip, struct file *fp, unsigned int cmd, un
  *	Now handle the board specific ioctls. These all depend on the
  *	minor number of the device they were called from.
  */
-	brdnr = iminor(ip);
+	brdnr = iminor(fp->f_dentry->d_inode);
 	if (brdnr >= STL_MAXBRDS)
 		return -ENODEV;
 	brdp = stli_brds[brdnr];
@@ -4420,6 +4361,8 @@ static const struct tty_operations stli_ops = {
 static const struct tty_port_operations stli_port_ops = {
 	.carrier_raised = stli_carrier_raised,
 	.dtr_rts = stli_dtr_rts,
+	.activate = stli_activate,
+	.shutdown = stli_shutdown,
 };
 
 /*****************************************************************************/

drivers/char/pcmcia/ipwireless/tty.c

@@ -603,7 +603,7 @@ void ipwireless_tty_free(struct ipw_tty *tty)
 	}
 }
 
-static struct tty_operations tty_ops = {
+static const struct tty_operations tty_ops = {
 	.open = ipw_open,
 	.close = ipw_close,
 	.hangup = ipw_hangup,

drivers/char/pty.c

@@ -659,7 +659,7 @@ static int __ptmx_open(struct inode *inode, struct file *filp)
 	if (!retval)
 		return 0;
 out1:
-	tty_release_dev(filp);
+	tty_release(inode, filp);
 	return retval;
 out:
 	devpts_kill_index(inode, index);

drivers/char/riscom8.c

@@ -793,26 +793,21 @@ static void rc_change_speed(struct tty_struct *tty, struct riscom_board *bp,
 }
 
 /* Must be called with interrupts enabled */
-static int rc_setup_port(struct tty_struct *tty, struct riscom_board *bp,
-						struct riscom_port *port)
+static int rc_activate_port(struct tty_port *port, struct tty_struct *tty)
 {
+	struct riscom_port *rp = container_of(port, struct riscom_port, port);
+	struct riscom_board *bp = port_Board(rp);
 	unsigned long flags;
 
-	if (port->port.flags & ASYNC_INITIALIZED)
-		return 0;
-
-	if (tty_port_alloc_xmit_buf(&port->port) < 0)
+	if (tty_port_alloc_xmit_buf(port) < 0)
 		return -ENOMEM;
 
 	spin_lock_irqsave(&riscom_lock, flags);
 
 	clear_bit(TTY_IO_ERROR, &tty->flags);
-	if (port->port.count == 1)
-		bp->count++;
-	port->xmit_cnt = port->xmit_head = port->xmit_tail = 0;
-	rc_change_speed(tty, bp, port);
-	port->port.flags |= ASYNC_INITIALIZED;
-
+	bp->count++;
+	rp->xmit_cnt = rp->xmit_head = rp->xmit_tail = 0;
+	rc_change_speed(tty, bp, rp);
 	spin_unlock_irqrestore(&riscom_lock, flags);
 	return 0;
 }
@@ -821,9 +816,6 @@ static int rc_setup_port(struct tty_struct *tty, struct riscom_board *bp,
 static void rc_shutdown_port(struct tty_struct *tty,
 			struct riscom_board *bp, struct riscom_port *port)
 {
-	if (!(port->port.flags & ASYNC_INITIALIZED))
-		return;
-
 #ifdef RC_REPORT_OVERRUN
 	printk(KERN_INFO "rc%d: port %d: Total %ld overruns were detected.\n",
 	       board_No(bp), port_No(port), port->overrun);
@@ -840,11 +832,6 @@ static void rc_shutdown_port(struct tty_struct *tty,
 	}
 #endif
 	tty_port_free_xmit_buf(&port->port);
-	if (C_HUPCL(tty)) {
-		/* Drop DTR */
-		bp->DTR |= (1u << port_No(port));
-		rc_out(bp, RC_DTR, bp->DTR);
-	}
 
 	/* Select port */
 	rc_out(bp, CD180_CAR, port_No(port));
@@ -856,7 +843,6 @@ static void rc_shutdown_port(struct tty_struct *tty,
 	rc_out(bp, CD180_IER, port->IER);
 
 	set_bit(TTY_IO_ERROR, &tty->flags);
-	port->port.flags &= ~ASYNC_INITIALIZED;
 
 	if (--bp->count < 0)  {
 		printk(KERN_INFO "rc%d: rc_shutdown_port: "
@@ -889,6 +875,20 @@ static int carrier_raised(struct tty_port *port)
 	return CD;
 }
 
+static void dtr_rts(struct tty_port *port, int onoff)
+{
+	struct riscom_port *p = container_of(port, struct riscom_port, port);
+	struct riscom_board *bp = port_Board(p);
+	unsigned long flags;
+
+	spin_lock_irqsave(&riscom_lock, flags);
+	bp->DTR &= ~(1u << port_No(p));
+	if (onoff == 0)
+		bp->DTR |= (1u << port_No(p));
+	rc_out(bp, RC_DTR, bp->DTR);
+	spin_unlock_irqrestore(&riscom_lock, flags);
+}
+
 static int rc_open(struct tty_struct *tty, struct file *filp)
 {
 	int board;
@@ -909,14 +909,7 @@ static int rc_open(struct tty_struct *tty, struct file *filp)
 	if (error)
 		return error;
 
-	port->port.count++;
-	tty->driver_data = port;
-	tty_port_tty_set(&port->port, tty);
-
-	error = rc_setup_port(tty, bp, port);
-	if (error == 0)
-		error = tty_port_block_til_ready(&port->port, tty, filp);
-	return error;
+	return tty_port_open(&port->port, tty, filp);
 }
 
 static void rc_flush_buffer(struct tty_struct *tty)
@@ -950,24 +943,23 @@ static void rc_close_port(struct tty_port *port)
 
 	spin_lock_irqsave(&riscom_lock, flags);
 	rp->IER &= ~IER_RXD;
-	if (port->flags & ASYNC_INITIALIZED) {
-		rp->IER &= ~IER_TXRDY;
-		rp->IER |= IER_TXEMPTY;
-		rc_out(bp, CD180_CAR, port_No(rp));
-		rc_out(bp, CD180_IER, rp->IER);
-		/*
-		 * Before we drop DTR, make sure the UART transmitter
-		 * has completely drained; this is especially
-		 * important if there is a transmit FIFO!
-		 */
-		timeout = jiffies + HZ;
-		while (rp->IER & IER_TXEMPTY) {
-			spin_unlock_irqrestore(&riscom_lock, flags);
-			msleep_interruptible(jiffies_to_msecs(rp->timeout));
-			spin_lock_irqsave(&riscom_lock, flags);
-			if (time_after(jiffies, timeout))
-				break;
-		}
+
+	rp->IER &= ~IER_TXRDY;
+	rp->IER |= IER_TXEMPTY;
+	rc_out(bp, CD180_CAR, port_No(rp));
+	rc_out(bp, CD180_IER, rp->IER);
+	/*
+	 * Before we drop DTR, make sure the UART transmitter
+	 * has completely drained; this is especially
+	 * important if there is a transmit FIFO!
+	 */
+	timeout = jiffies + HZ;
+	while (rp->IER & IER_TXEMPTY) {
+		spin_unlock_irqrestore(&riscom_lock, flags);
+		msleep_interruptible(jiffies_to_msecs(rp->timeout));
+		spin_lock_irqsave(&riscom_lock, flags);
+		if (time_after(jiffies, timeout))
+			break;
 	}
 	rc_shutdown_port(port->tty, bp, rp);
 	spin_unlock_irqrestore(&riscom_lock, flags);
@@ -1354,7 +1346,6 @@ static void rc_hangup(struct tty_struct *tty)
 	if (rc_paranoia_check(port, tty->name, "rc_hangup"))
 		return;
 
-	rc_shutdown_port(tty, port_Board(port), port);
 	tty_port_hangup(&port->port);
 }
 
@@ -1401,7 +1392,9 @@ static const struct tty_operations riscom_ops = {
 
 static const struct tty_port_operations riscom_port_ops = {
 	.carrier_raised = carrier_raised,
+	.dtr_rts = dtr_rts,
 	.shutdown = rc_close_port,
+	.activate = rc_activate_port,
 };
 
 

drivers/char/stallion.c

@@ -407,7 +407,7 @@ static unsigned int	stl_baudrates[] = {
  *	Declare all those functions in this driver!
  */
 
-static int	stl_memioctl(struct inode *ip, struct file *fp, unsigned int cmd, unsigned long arg);
+static long	stl_memioctl(struct file *fp, unsigned int cmd, unsigned long arg);
 static int	stl_brdinit(struct stlbrd *brdp);
 static int	stl_getportstats(struct tty_struct *tty, struct stlport *portp, comstats_t __user *cp);
 static int	stl_clrportstats(struct stlport *portp, comstats_t __user *cp);
@@ -607,7 +607,7 @@ static unsigned int	sc26198_baudtable[] = {
  */
 static const struct file_operations	stl_fsiomem = {
 	.owner		= THIS_MODULE,
-	.ioctl		= stl_memioctl,
+	.unlocked_ioctl	= stl_memioctl,
 };
 
 static struct class *stallion_class;
@@ -702,6 +702,24 @@ static struct stlbrd *stl_allocbrd(void)
 
 /*****************************************************************************/
 
+static int stl_activate(struct tty_port *port, struct tty_struct *tty)
+{
+	struct stlport *portp = container_of(port, struct stlport, port);
+	if (!portp->tx.buf) {
+		portp->tx.buf = kmalloc(STL_TXBUFSIZE, GFP_KERNEL);
+		if (!portp->tx.buf)
+			return -ENOMEM;
+		portp->tx.head = portp->tx.buf;
+		portp->tx.tail = portp->tx.buf;
+	}
+	stl_setport(portp, tty->termios);
+	portp->sigs = stl_getsignals(portp);
+	stl_setsignals(portp, 1, 1);
+	stl_enablerxtx(portp, 1, 1);
+	stl_startrxtx(portp, 1, 0);
+	return 0;
+}
+
 static int stl_open(struct tty_struct *tty, struct file *filp)
 {
 	struct stlport	*portp;
@@ -737,32 +755,8 @@ static int stl_open(struct tty_struct *tty, struct file *filp)
 	if (portp == NULL)
 		return -ENODEV;
 	port = &portp->port;
+	return tty_port_open(&portp->port, tty, filp);
 
-/*
- *	On the first open of the device setup the port hardware, and
- *	initialize the per port data structure.
- */
-	tty_port_tty_set(port, tty);
-	tty->driver_data = portp;
-	port->count++;
-
-	if ((port->flags & ASYNC_INITIALIZED) == 0) {
-		if (!portp->tx.buf) {
-			portp->tx.buf = kmalloc(STL_TXBUFSIZE, GFP_KERNEL);
-			if (!portp->tx.buf)
-				return -ENOMEM;
-			portp->tx.head = portp->tx.buf;
-			portp->tx.tail = portp->tx.buf;
-		}
-		stl_setport(portp, tty->termios);
-		portp->sigs = stl_getsignals(portp);
-		stl_setsignals(portp, 1, 1);
-		stl_enablerxtx(portp, 1, 1);
-		stl_startrxtx(portp, 1, 0);
-		clear_bit(TTY_IO_ERROR, &tty->flags);
-		port->flags |= ASYNC_INITIALIZED;
-	}
-	return tty_port_block_til_ready(port, tty, filp);
 }
 
 /*****************************************************************************/
@@ -826,38 +820,12 @@ static void stl_waituntilsent(struct tty_struct *tty, int timeout)
 
 /*****************************************************************************/
 
-static void stl_close(struct tty_struct *tty, struct file *filp)
+static void stl_shutdown(struct tty_port *port)
 {
-	struct stlport	*portp;
-	struct tty_port *port;
-	unsigned long	flags;
-
-	pr_debug("stl_close(tty=%p,filp=%p)\n", tty, filp);
-
-	portp = tty->driver_data;
-	BUG_ON(portp == NULL);
-
-	port = &portp->port;
-
-	if (tty_port_close_start(port, tty, filp) == 0)
-		return;
-/*
- *	May want to wait for any data to drain before closing. The BUSY
- *	flag keeps track of whether we are still sending or not - it is
- *	very accurate for the cd1400, not quite so for the sc26198.
- *	(The sc26198 has no "end-of-data" interrupt only empty FIFO)
- */
-	stl_waituntilsent(tty, (HZ / 2));
-
-	spin_lock_irqsave(&port->lock, flags);
-	portp->port.flags &= ~ASYNC_INITIALIZED;
-	spin_unlock_irqrestore(&port->lock, flags);
-
+	struct stlport *portp = container_of(port, struct stlport, port);
 	stl_disableintrs(portp);
-	if (tty->termios->c_cflag & HUPCL)
-		stl_setsignals(portp, 0, 0);
 	stl_enablerxtx(portp, 0, 0);
-	stl_flushbuffer(tty);
+	stl_flush(portp);
 	portp->istate = 0;
 	if (portp->tx.buf != NULL) {
 		kfree(portp->tx.buf);
@@ -865,9 +833,16 @@ static void stl_close(struct tty_struct *tty, struct file *filp)
 		portp->tx.head = NULL;
 		portp->tx.tail = NULL;
 	}
+}
+
+static void stl_close(struct tty_struct *tty, struct file *filp)
+{
+	struct stlport*portp;
+	pr_debug("stl_close(tty=%p,filp=%p)\n", tty, filp);
 
-	tty_port_close_end(port, tty);
-	tty_port_tty_set(port, NULL);
+	portp = tty->driver_data;
+	BUG_ON(portp == NULL);
+	tty_port_close(&portp->port, tty, filp);
 }
 
 /*****************************************************************************/
@@ -1314,35 +1289,12 @@ static void stl_stop(struct tty_struct *tty)
 
 static void stl_hangup(struct tty_struct *tty)
 {
-	struct stlport	*portp;
-	struct tty_port *port;
-	unsigned long flags;
-
+	struct stlport	*portp = tty->driver_data;
 	pr_debug("stl_hangup(tty=%p)\n", tty);
 
-	portp = tty->driver_data;
 	if (portp == NULL)
 		return;
-	port = &portp->port;
-
-	spin_lock_irqsave(&port->lock, flags);
-	port->flags &= ~ASYNC_INITIALIZED;
-	spin_unlock_irqrestore(&port->lock, flags);
-
-	stl_disableintrs(portp);
-	if (tty->termios->c_cflag & HUPCL)
-		stl_setsignals(portp, 0, 0);
-	stl_enablerxtx(portp, 0, 0);
-	stl_flushbuffer(tty);
-	portp->istate = 0;
-	set_bit(TTY_IO_ERROR, &tty->flags);
-	if (portp->tx.buf != NULL) {
-		kfree(portp->tx.buf);
-		portp->tx.buf = NULL;
-		portp->tx.head = NULL;
-		portp->tx.tail = NULL;
-	}
-	tty_port_hangup(port);
+	tty_port_hangup(&portp->port);
 }
 
 /*****************************************************************************/
@@ -2486,18 +2438,19 @@ static int stl_getbrdstruct(struct stlbrd __user *arg)
  *	collection.
  */
 
-static int stl_memioctl(struct inode *ip, struct file *fp, unsigned int cmd, unsigned long arg)
+static long stl_memioctl(struct file *fp, unsigned int cmd, unsigned long arg)
 {
 	int	brdnr, rc;
 	void __user *argp = (void __user *)arg;
 
-	pr_debug("stl_memioctl(ip=%p,fp=%p,cmd=%x,arg=%lx)\n", ip, fp, cmd,arg);
+	pr_debug("stl_memioctl(fp=%p,cmd=%x,arg=%lx)\n", fp, cmd,arg);
 
-	brdnr = iminor(ip);
+	brdnr = iminor(fp->f_dentry->d_inode);
 	if (brdnr >= STL_MAXBRDS)
 		return -ENODEV;
 	rc = 0;
 
+	lock_kernel();
 	switch (cmd) {
 	case COM_GETPORTSTATS:
 		rc = stl_getportstats(NULL, NULL, argp);
@@ -2518,7 +2471,7 @@ static int stl_memioctl(struct inode *ip, struct file *fp, unsigned int cmd, uns
 		rc = -ENOIOCTLCMD;
 		break;
 	}
-
+	unlock_kernel();
 	return rc;
 }
 
@@ -2549,6 +2502,8 @@ static const struct tty_operations stl_ops = {
 static const struct tty_port_operations stl_port_ops = {
 	.carrier_raised = stl_carrier_raised,
 	.dtr_rts = stl_dtr_rts,
+	.activate = stl_activate,
+	.shutdown = stl_shutdown,
 };
 
 /*****************************************************************************/

drivers/char/tty_ldisc.c

@@ -34,6 +34,8 @@
 #include <linux/vt_kern.h>
 #include <linux/selection.h>
 
+#include <linux/smp_lock.h>	/* For the moment */
+
 #include <linux/kmod.h>
 #include <linux/nsproxy.h>
 
@@ -443,8 +445,14 @@ static void tty_set_termios_ldisc(struct tty_struct *tty, int num)
 static int tty_ldisc_open(struct tty_struct *tty, struct tty_ldisc *ld)
 {
 	WARN_ON(test_and_set_bit(TTY_LDISC_OPEN, &tty->flags));
-	if (ld->ops->open)
-		return ld->ops->open(tty);
+	if (ld->ops->open) {
+		int ret;
+                /* BKL here locks verus a hangup event */
+		lock_kernel();
+		ret = ld->ops->open(tty);
+		unlock_kernel();
+		return ret;
+	}
 	return 0;
 }
 
@@ -545,6 +553,7 @@ int tty_set_ldisc(struct tty_struct *tty, int ldisc)
 	if (IS_ERR(new_ldisc))
 		return PTR_ERR(new_ldisc);
 
+	lock_kernel();
 	/*
 	 *	We need to look at the tty locking here for pty/tty pairs
 	 *	when both sides try to change in parallel.
@@ -558,10 +567,12 @@ int tty_set_ldisc(struct tty_struct *tty, int ldisc)
 	 */
 
 	if (tty->ldisc->ops->num == ldisc) {
+		unlock_kernel();
 		tty_ldisc_put(new_ldisc);
 		return 0;
 	}
 
+	unlock_kernel();
 	/*
 	 *	Problem: What do we do if this blocks ?
 	 *	We could deadlock here
@@ -582,6 +593,9 @@ int tty_set_ldisc(struct tty_struct *tty, int ldisc)
 			test_bit(TTY_LDISC_CHANGING, &tty->flags) == 0);
 		mutex_lock(&tty->ldisc_mutex);
 	}
+
+	lock_kernel();
+
 	set_bit(TTY_LDISC_CHANGING, &tty->flags);
 
 	/*
@@ -592,6 +606,8 @@ int tty_set_ldisc(struct tty_struct *tty, int ldisc)
 	tty->receive_room = 0;
 
 	o_ldisc = tty->ldisc;
+
+	unlock_kernel();
 	/*
 	 *	Make sure we don't change while someone holds a
 	 *	reference to the line discipline. The TTY_LDISC bit
@@ -617,12 +633,14 @@ int tty_set_ldisc(struct tty_struct *tty, int ldisc)
 	flush_scheduled_work();
 
 	mutex_lock(&tty->ldisc_mutex);
+	lock_kernel();
 	if (test_bit(TTY_HUPPED, &tty->flags)) {
 		/* We were raced by the hangup method. It will have stomped
 		   the ldisc data and closed the ldisc down */
 		clear_bit(TTY_LDISC_CHANGING, &tty->flags);
 		mutex_unlock(&tty->ldisc_mutex);
 		tty_ldisc_put(new_ldisc);
+		unlock_kernel();
 		return -EIO;
 	}
 
@@ -664,6 +682,7 @@ int tty_set_ldisc(struct tty_struct *tty, int ldisc)
 	if (o_work)
 		schedule_delayed_work(&o_tty->buf.work, 1);
 	mutex_unlock(&tty->ldisc_mutex);
+	unlock_kernel();
 	return retval;
 }
 

drivers/char/tty_port.c

@@ -25,19 +25,21 @@ void tty_port_init(struct tty_port *port)
 	init_waitqueue_head(&port->close_wait);
 	init_waitqueue_head(&port->delta_msr_wait);
 	mutex_init(&port->mutex);
+	mutex_init(&port->buf_mutex);
 	spin_lock_init(&port->lock);
 	port->close_delay = (50 * HZ) / 100;
 	port->closing_wait = (3000 * HZ) / 100;
+	kref_init(&port->kref);
 }
 EXPORT_SYMBOL(tty_port_init);
 
 int tty_port_alloc_xmit_buf(struct tty_port *port)
 {
 	/* We may sleep in get_zeroed_page() */
-	mutex_lock(&port->mutex);
+	mutex_lock(&port->buf_mutex);
 	if (port->xmit_buf == NULL)
 		port->xmit_buf = (unsigned char *)get_zeroed_page(GFP_KERNEL);
-	mutex_unlock(&port->mutex);
+	mutex_unlock(&port->buf_mutex);
 	if (port->xmit_buf == NULL)
 		return -ENOMEM;
 	return 0;
@@ -46,15 +48,32 @@ EXPORT_SYMBOL(tty_port_alloc_xmit_buf);
 
 void tty_port_free_xmit_buf(struct tty_port *port)
 {
-	mutex_lock(&port->mutex);
+	mutex_lock(&port->buf_mutex);
 	if (port->xmit_buf != NULL) {
 		free_page((unsigned long)port->xmit_buf);
 		port->xmit_buf = NULL;
 	}
-	mutex_unlock(&port->mutex);
+	mutex_unlock(&port->buf_mutex);
 }
 EXPORT_SYMBOL(tty_port_free_xmit_buf);
 
+static void tty_port_destructor(struct kref *kref)
+{
+	struct tty_port *port = container_of(kref, struct tty_port, kref);
+	if (port->xmit_buf)
+		free_page((unsigned long)port->xmit_buf);
+	if (port->ops->destruct)
+		port->ops->destruct(port);
+	else
+		kfree(port);
+}
+
+void tty_port_put(struct tty_port *port)
+{
+	if (port)
+		kref_put(&port->kref, tty_port_destructor);
+}
+EXPORT_SYMBOL(tty_port_put);
 
 /**
  *	tty_port_tty_get	-	get a tty reference
@@ -99,10 +118,11 @@ EXPORT_SYMBOL(tty_port_tty_set);
 
 static void tty_port_shutdown(struct tty_port *port)
 {
+	mutex_lock(&port->mutex);
 	if (port->ops->shutdown &&
 		test_and_clear_bit(ASYNCB_INITIALIZED, &port->flags))
 			port->ops->shutdown(port);
-
+	mutex_unlock(&port->mutex);
 }
 
 /**
@@ -120,8 +140,10 @@ void tty_port_hangup(struct tty_port *port)
 	spin_lock_irqsave(&port->lock, flags);
 	port->count = 0;
 	port->flags &= ~ASYNC_NORMAL_ACTIVE;
-	if (port->tty)
+	if (port->tty) {
+		set_bit(TTY_IO_ERROR, &port->tty->flags);
 		tty_kref_put(port->tty);
+	}
 	port->tty = NULL;
 	spin_unlock_irqrestore(&port->lock, flags);
 	wake_up_interruptible(&port->open_wait);
@@ -198,7 +220,7 @@ EXPORT_SYMBOL(tty_port_lower_dtr_rts);
  *	management of these lines. Note that the dtr/rts raise is done each
  *	iteration as a hangup may have previously dropped them while we wait.
  */
- 
+
 int tty_port_block_til_ready(struct tty_port *port,
 				struct tty_struct *tty, struct file *filp)
 {
@@ -253,7 +275,8 @@ int tty_port_block_til_ready(struct tty_port *port,
 			tty_port_raise_dtr_rts(port);
 
 		prepare_to_wait(&port->open_wait, &wait, TASK_INTERRUPTIBLE);
-		/* Check for a hangup or uninitialised port. Return accordingly */
+		/* Check for a hangup or uninitialised port.
+							Return accordingly */
 		if (tty_hung_up_p(filp) || !(port->flags & ASYNC_INITIALIZED)) {
 			if (port->flags & ASYNC_HUP_NOTIFY)
 				retval = -EAGAIN;
@@ -285,11 +308,11 @@ int tty_port_block_til_ready(struct tty_port *port,
 		port->flags |= ASYNC_NORMAL_ACTIVE;
 	spin_unlock_irqrestore(&port->lock, flags);
 	return retval;
-	
 }
 EXPORT_SYMBOL(tty_port_block_til_ready);
 
-int tty_port_close_start(struct tty_port *port, struct tty_struct *tty, struct file *filp)
+int tty_port_close_start(struct tty_port *port,
+				struct tty_struct *tty, struct file *filp)
 {
 	unsigned long flags;
 
@@ -299,7 +322,7 @@ int tty_port_close_start(struct tty_port *port, struct tty_struct *tty, struct f
 		return 0;
 	}
 
-	if( tty->count == 1 && port->count != 1) {
+	if (tty->count == 1 && port->count != 1) {
 		printk(KERN_WARNING
 		    "tty_port_close_start: tty->count = 1 port count = %d.\n",
 								port->count);
@@ -331,12 +354,20 @@ int tty_port_close_start(struct tty_port *port, struct tty_struct *tty, struct f
 		long timeout;
 
 		if (bps > 1200)
-			timeout = max_t(long, (HZ * 10 * port->drain_delay) / bps,
-								HZ / 10);
+			timeout = max_t(long,
+				(HZ * 10 * port->drain_delay) / bps, HZ / 10);
 		else
 			timeout = 2 * HZ;
 		schedule_timeout_interruptible(timeout);
 	}
+	/* Flush the ldisc buffering */
+	tty_ldisc_flush(tty);
+
+	/* Drop DTR/RTS if HUPCL is set. This causes any attached modem to
+	   hang up the line */
+	if (tty->termios->c_cflag & HUPCL)
+		tty_port_lower_dtr_rts(port);
+
 	/* Don't call port->drop for the last reference. Callers will want
 	   to drop the last active reference in ->shutdown() or the tty
 	   shutdown path */
@@ -348,11 +379,6 @@ void tty_port_close_end(struct tty_port *port, struct tty_struct *tty)
 {
 	unsigned long flags;
 
-	tty_ldisc_flush(tty);
-
-	if (tty->termios->c_cflag & HUPCL)
-		tty_port_lower_dtr_rts(port);
-
 	spin_lock_irqsave(&port->lock, flags);
 	tty->closing = 0;
 
@@ -377,7 +403,42 @@ void tty_port_close(struct tty_port *port, struct tty_struct *tty,
 	if (tty_port_close_start(port, tty, filp) == 0)
 		return;
 	tty_port_shutdown(port);
+	set_bit(TTY_IO_ERROR, &tty->flags);
 	tty_port_close_end(port, tty);
 	tty_port_tty_set(port, NULL);
 }
 EXPORT_SYMBOL(tty_port_close);
+
+int tty_port_open(struct tty_port *port, struct tty_struct *tty,
+							struct file *filp)
+{
+	spin_lock_irq(&port->lock);
+	if (!tty_hung_up_p(filp))
+		++port->count;
+	spin_unlock_irq(&port->lock);
+	tty_port_tty_set(port, tty);
+
+	/*
+	 * Do the device-specific open only if the hardware isn't
+	 * already initialized. Serialize open and shutdown using the
+	 * port mutex.
+	 */
+
+	mutex_lock(&port->mutex);
+
+	if (!test_bit(ASYNCB_INITIALIZED, &port->flags)) {
+		clear_bit(TTY_IO_ERROR, &tty->flags);
+		if (port->ops->activate) {
+			int retval = port->ops->activate(port, tty);
+			if (retval) {
+				mutex_unlock(&port->mutex);
+				return retval;
+			}
+		}
+		set_bit(ASYNCB_INITIALIZED, &port->flags);
+	}
+	mutex_unlock(&port->mutex);
+	return tty_port_block_til_ready(port, tty, filp);
+}
+
+EXPORT_SYMBOL(tty_port_open);

include/linux/Kbuild

@@ -214,7 +214,6 @@ unifdef-y += futex.h
 unifdef-y += fs.h
 unifdef-y += gameport.h
 unifdef-y += generic_serial.h
-unifdef-y += hayesesp.h
 unifdef-y += hdlcdrv.h
 unifdef-y += hdlc.h
 unifdef-y += hdreg.h