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Commit 0de9a702 authored by Oliver Neukum's avatar Oliver Neukum Committed by Greg Kroah-Hartman
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USB: overhaul of mos7840 driver 

This fixes:

- breaking DMA rules about buffers
- usage of _global_ variables to save a single device's attributes
- racy access to urb->status
- smp monotonity issue with statistics
- use of one buffer for many simultaneous URBs
- error handling introduced
- several instances of following NULL pointers
- use after free
- unnecessary GFP_ATOMIC
- GFP_KERNEL in interrupt
- various cleanups
- write room granularity issue that bit cdc-acm
- race in shutdown
Signed-off-by: default avatarOliver Neukum <oneukum@suse.de>
Signed-off-by: default avatarGreg Kroah-Hartman <gregkh@suse.de>
parent 96c706ed
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Showing with 145 additions and 88 deletions
drivers/usb/serial/mos7840.c
View file @ 0de9a702
......@@ -176,9 +176,12 @@ struct moschip_port {
int port_num; /*Actual port number in the device(1,2,etc) */
struct urb *write_urb; /* write URB for this port */
struct urb *read_urb; /* read URB for this port */
struct urb *int_urb;
__u8 shadowLCR; /* last LCR value received */
__u8 shadowMCR; /* last MCR value received */
char open;
char open_ports;
char zombie;
wait_queue_head_t wait_chase; /* for handling sleeping while waiting for chase to finish */
wait_queue_head_t delta_msr_wait; /* for handling sleeping while waiting for msr change to happen */
int delta_msr_cond;
......@@ -191,17 +194,17 @@ struct moschip_port {
__u8 DcrRegOffset;
//for processing control URBS in interrupt context
struct urb *control_urb;
struct usb_ctrlrequest *dr;
char *ctrl_buf;
int MsrLsr;
spinlock_t pool_lock;
struct urb *write_urb_pool[NUM_URBS];
char busy[NUM_URBS];
};
static int debug;
static int mos7840_num_ports; //this says the number of ports in the device
static int mos7840_num_open_ports;
/*
* mos7840_set_reg_sync
......@@ -254,7 +257,7 @@ static int mos7840_set_uart_reg(struct usb_serial_port *port, __u16 reg,
struct usb_device *dev = port->serial->dev;
val = val & 0x00ff;
// For the UART control registers, the application number need to be Or'ed
if (mos7840_num_ports == 4) {
if (port->serial->num_ports == 4) {
val |=
(((__u16) port->number - (__u16) (port->serial->minor)) +
1) << 8;
......@@ -294,7 +297,7 @@ static int mos7840_get_uart_reg(struct usb_serial_port *port, __u16 reg,
//dbg("application number is %4x \n",(((__u16)port->number - (__u16)(port->serial->minor))+1)<<8);
/*Wval is same as application number */
if (mos7840_num_ports == 4) {
if (port->serial->num_ports == 4) {
Wval =
(((__u16) port->number - (__u16) (port->serial->minor)) +
1) << 8;
......@@ -352,7 +355,7 @@ static inline struct moschip_port *mos7840_get_port_private(struct
return (struct moschip_port *)usb_get_serial_port_data(port);
}
static int mos7840_handle_new_msr(struct moschip_port *port, __u8 new_msr)
static void mos7840_handle_new_msr(struct moschip_port *port, __u8 new_msr)
{
struct moschip_port *mos7840_port;
struct async_icount *icount;
......@@ -366,22 +369,24 @@ static int mos7840_handle_new_msr(struct moschip_port *port, __u8 new_msr)
/* update input line counters */
if (new_msr & MOS_MSR_DELTA_CTS) {
icount->cts++;
smp_wmb();
}
if (new_msr & MOS_MSR_DELTA_DSR) {
icount->dsr++;
smp_wmb();
}
if (new_msr & MOS_MSR_DELTA_CD) {
icount->dcd++;
smp_wmb();
}
if (new_msr & MOS_MSR_DELTA_RI) {
icount->rng++;
smp_wmb();
}
}
return 0;
}
static int mos7840_handle_new_lsr(struct moschip_port *port, __u8 new_lsr)
static void mos7840_handle_new_lsr(struct moschip_port *port, __u8 new_lsr)
{
struct async_icount *icount;
......@@ -400,18 +405,20 @@ static int mos7840_handle_new_lsr(struct moschip_port *port, __u8 new_lsr)
icount = &port->icount;
if (new_lsr & SERIAL_LSR_BI) {
icount->brk++;
smp_wmb();
}
if (new_lsr & SERIAL_LSR_OE) {
icount->overrun++;
smp_wmb();
}
if (new_lsr & SERIAL_LSR_PE) {
icount->parity++;
smp_wmb();
}
if (new_lsr & SERIAL_LSR_FE) {
icount->frame++;
smp_wmb();
}
return 0;
}
/************************************************************************/
......@@ -426,12 +433,15 @@ static void mos7840_control_callback(struct urb *urb)
unsigned char *data;
struct moschip_port *mos7840_port;
__u8 regval = 0x0;
int result = 0;
if (!urb) {
dbg("%s", "Invalid Pointer !!!!:\n");
return;
}
mos7840_port = (struct moschip_port *)urb->context;
switch (urb->status) {
case 0:
/* success */
......@@ -449,8 +459,6 @@ static void mos7840_control_callback(struct urb *urb)
goto exit;
}
mos7840_port = (struct moschip_port *)urb->context;
dbg("%s urb buffer size is %d\n", __FUNCTION__, urb->actual_length);
dbg("%s mos7840_port->MsrLsr is %d port %d\n", __FUNCTION__,
mos7840_port->MsrLsr, mos7840_port->port_num);
......@@ -462,21 +470,26 @@ static void mos7840_control_callback(struct urb *urb)
else if (mos7840_port->MsrLsr == 1)
mos7840_handle_new_lsr(mos7840_port, regval);
exit:
return;
exit:
spin_lock(&mos7840_port->pool_lock);
if (!mos7840_port->zombie)
result = usb_submit_urb(mos7840_port->int_urb, GFP_ATOMIC);
spin_unlock(&mos7840_port->pool_lock);
if (result) {
dev_err(&urb->dev->dev,
"%s - Error %d submitting interrupt urb\n",
__FUNCTION__, result);
}
}
static int mos7840_get_reg(struct moschip_port *mcs, __u16 Wval, __u16 reg,
__u16 * val)
{
struct usb_device *dev = mcs->port->serial->dev;
struct usb_ctrlrequest *dr = NULL;
unsigned char *buffer = NULL;
int ret = 0;
buffer = (__u8 *) mcs->ctrl_buf;
struct usb_ctrlrequest *dr = mcs->dr;
unsigned char *buffer = mcs->ctrl_buf;
int ret;
// dr=(struct usb_ctrlrequest *)(buffer);
dr = (void *)(buffer + 2);
dr->bRequestType = MCS_RD_RTYPE;
dr->bRequest = MCS_RDREQ;
dr->wValue = cpu_to_le16(Wval); //0;
......@@ -506,8 +519,8 @@ static void mos7840_interrupt_callback(struct urb *urb)
__u16 Data;
unsigned char *data;
__u8 sp[5], st;
int i;
__u16 wval;
int i, rv = 0;
__u16 wval, wreg = 0;
dbg("%s", " : Entering\n");
if (!urb) {
......@@ -569,31 +582,34 @@ static void mos7840_interrupt_callback(struct urb *urb)
dbg("Serial Port %d: Receiver status error or ", i);
dbg("address bit detected in 9-bit mode\n");
mos7840_port->MsrLsr = 1;
mos7840_get_reg(mos7840_port, wval,
LINE_STATUS_REGISTER,
&Data);
wreg = LINE_STATUS_REGISTER;
break;
case SERIAL_IIR_MS:
dbg("Serial Port %d: Modem status change\n", i);
mos7840_port->MsrLsr = 0;
mos7840_get_reg(mos7840_port, wval,
MODEM_STATUS_REGISTER,
&Data);
wreg = MODEM_STATUS_REGISTER;
break;
}
spin_lock(&mos7840_port->pool_lock);
if (!mos7840_port->zombie) {
rv = mos7840_get_reg(mos7840_port, wval, wreg, &Data);
} else {
spin_unlock(&mos7840_port->pool_lock);
return;
}
spin_unlock(&mos7840_port->pool_lock);
}
}
exit:
}
if (!(rv < 0)) /* the completion handler for the control urb will resubmit */
return;
exit:
result = usb_submit_urb(urb, GFP_ATOMIC);
if (result) {
dev_err(&urb->dev->dev,
"%s - Error %d submitting interrupt urb\n",
__FUNCTION__, result);
}
return;
}
static int mos7840_port_paranoia_check(struct usb_serial_port *port,
......@@ -634,7 +650,8 @@ static struct usb_serial *mos7840_get_usb_serial(struct usb_serial_port *port,
if (!port ||
mos7840_port_paranoia_check(port, function) ||
mos7840_serial_paranoia_check(port->serial, function)) {
/* then say that we don't have a valid usb_serial thing, which will * end up genrating -ENODEV return values */
/* then say that we don't have a valid usb_serial thing, which will
* end up genrating -ENODEV return values */
return NULL;
}
......@@ -699,6 +716,7 @@ static void mos7840_bulk_in_callback(struct urb *urb)
tty_flip_buffer_push(tty);
}
mos7840_port->icount.rx += urb->actual_length;
smp_wmb();
dbg("mos7840_port->icount.rx is %d:\n",
mos7840_port->icount.rx);
}
......@@ -708,7 +726,7 @@ static void mos7840_bulk_in_callback(struct urb *urb)
return;
}
if (mos7840_port->read_urb->status != -EINPROGRESS) {
mos7840_port->read_urb->dev = serial->dev;
status = usb_submit_urb(mos7840_port->read_urb, GFP_ATOMIC);
......@@ -717,7 +735,6 @@ static void mos7840_bulk_in_callback(struct urb *urb)
dbg(" usb_submit_urb(read bulk) failed, status = %d",
status);
}
}
}
/*****************************************************************************
......@@ -730,17 +747,28 @@ static void mos7840_bulk_out_data_callback(struct urb *urb)
{
struct moschip_port *mos7840_port;
struct tty_struct *tty;
int i;
if (!urb) {
dbg("%s", "Invalid Pointer !!!!:\n");
return;
}
mos7840_port = (struct moschip_port *)urb->context;
spin_lock(&mos7840_port->pool_lock);
for (i = 0; i < NUM_URBS; i++) {
if (urb == mos7840_port->write_urb_pool[i]) {
mos7840_port->busy[i] = 0;
break;
}
}
spin_unlock(&mos7840_port->pool_lock);
if (urb->status) {
dbg("nonzero write bulk status received:%d\n", urb->status);
return;
}
mos7840_port = (struct moschip_port *)urb->context;
if (!mos7840_port) {
dbg("%s", "NULL mos7840_port pointer \n");
return;
......@@ -792,13 +820,13 @@ static int mos7840_open(struct usb_serial_port *port, struct file *filp)
__u16 Data;
int status;
struct moschip_port *mos7840_port;
struct moschip_port *port0;
if (mos7840_port_paranoia_check(port, __FUNCTION__)) {
dbg("%s", "Port Paranoia failed \n");
return -ENODEV;
}
mos7840_num_open_ports++;
serial = port->serial;
if (mos7840_serial_paranoia_check(serial, __FUNCTION__)) {
......@@ -807,16 +835,18 @@ static int mos7840_open(struct usb_serial_port *port, struct file *filp)
}
mos7840_port = mos7840_get_port_private(port);
port0 = mos7840_get_port_private(serial->port[0]);
if (mos7840_port == NULL)
if (mos7840_port == NULL || port0 == NULL)
return -ENODEV;
usb_clear_halt(serial->dev, port->write_urb->pipe);
usb_clear_halt(serial->dev, port->read_urb->pipe);
port0->open_ports++;
/* Initialising the write urb pool */
for (j = 0; j < NUM_URBS; ++j) {
urb = usb_alloc_urb(0, GFP_ATOMIC);
urb = usb_alloc_urb(0, GFP_KERNEL);
mos7840_port->write_urb_pool[j] = urb;
if (urb == NULL) {
......@@ -824,10 +854,10 @@ static int mos7840_open(struct usb_serial_port *port, struct file *filp)
continue;
}
urb->transfer_buffer = NULL;
urb->transfer_buffer =
kmalloc(URB_TRANSFER_BUFFER_SIZE, GFP_KERNEL);
urb->transfer_buffer = kmalloc(URB_TRANSFER_BUFFER_SIZE, GFP_KERNEL);
if (!urb->transfer_buffer) {
usb_free_urb(urb);
mos7840_port->write_urb_pool[j] = NULL;
err("%s-out of memory for urb buffers.", __FUNCTION__);
continue;
}
......@@ -879,9 +909,7 @@ static int mos7840_open(struct usb_serial_port *port, struct file *filp)
}
Data |= 0x08; //Driver done bit
Data |= 0x20; //rx_disable
status = 0;
status =
mos7840_set_reg_sync(port, mos7840_port->ControlRegOffset, Data);
status = mos7840_set_reg_sync(port, mos7840_port->ControlRegOffset, Data);
if (status < 0) {
dbg("writing Controlreg failed\n");
return -1;
......@@ -893,7 +921,6 @@ static int mos7840_open(struct usb_serial_port *port, struct file *filp)
////////////////////////////////////
Data = 0x00;
status = 0;
status = mos7840_set_uart_reg(port, INTERRUPT_ENABLE_REGISTER, Data);
if (status < 0) {
dbg("disableing interrupts failed\n");
......@@ -901,7 +928,6 @@ static int mos7840_open(struct usb_serial_port *port, struct file *filp)
}
// Set FIFO_CONTROL_REGISTER to the default value
Data = 0x00;
status = 0;
status = mos7840_set_uart_reg(port, FIFO_CONTROL_REGISTER, Data);
if (status < 0) {
dbg("Writing FIFO_CONTROL_REGISTER failed\n");
......@@ -909,7 +935,6 @@ static int mos7840_open(struct usb_serial_port *port, struct file *filp)
}
Data = 0xcf;
status = 0;
status = mos7840_set_uart_reg(port, FIFO_CONTROL_REGISTER, Data);
if (status < 0) {
dbg("Writing FIFO_CONTROL_REGISTER failed\n");
......@@ -917,22 +942,18 @@ static int mos7840_open(struct usb_serial_port *port, struct file *filp)
}
Data = 0x03;
status = 0;
status = mos7840_set_uart_reg(port, LINE_CONTROL_REGISTER, Data);
mos7840_port->shadowLCR = Data;
Data = 0x0b;
status = 0;
status = mos7840_set_uart_reg(port, MODEM_CONTROL_REGISTER, Data);
mos7840_port->shadowMCR = Data;
Data = 0x00;
status = 0;
status = mos7840_get_uart_reg(port, LINE_CONTROL_REGISTER, &Data);
mos7840_port->shadowLCR = Data;
Data |= SERIAL_LCR_DLAB; //data latch enable in LCR 0x80
status = 0;
status = mos7840_set_uart_reg(port, LINE_CONTROL_REGISTER, Data);
Data = 0x0c;
......@@ -999,7 +1020,7 @@ static int mos7840_open(struct usb_serial_port *port, struct file *filp)
/* Check to see if we've set up our endpoint info yet *
* (can't set it up in mos7840_startup as the structures *
* were not set up at that time.) */
if (mos7840_num_open_ports == 1) {
if (port0->open_ports == 1) {
if (serial->port[0]->interrupt_in_buffer == NULL) {
/* set up interrupt urb */
......@@ -1097,6 +1118,7 @@ static int mos7840_chars_in_buffer(struct usb_serial_port *port)
{
int i;
int chars = 0;
unsigned long flags;
struct moschip_port *mos7840_port;
dbg("%s \n", " mos7840_chars_in_buffer:entering ...........");
......@@ -1112,13 +1134,15 @@ static int mos7840_chars_in_buffer(struct usb_serial_port *port)
return -1;
}
spin_lock_irqsave(&mos7840_port->pool_lock,flags);
for (i = 0; i < NUM_URBS; ++i) {
if (mos7840_port->write_urb_pool[i]->status == -EINPROGRESS) {
if (mos7840_port->busy[i]) {
chars += URB_TRANSFER_BUFFER_SIZE;
}
}
spin_unlock_irqrestore(&mos7840_port->pool_lock,flags);
dbg("%s - returns %d", __FUNCTION__, chars);
return (chars);
return chars;
}
......@@ -1172,6 +1196,7 @@ static void mos7840_close(struct usb_serial_port *port, struct file *filp)
{
struct usb_serial *serial;
struct moschip_port *mos7840_port;
struct moschip_port *port0;
int j;
__u16 Data;
......@@ -1189,10 +1214,10 @@ static void mos7840_close(struct usb_serial_port *port, struct file *filp)
}
mos7840_port = mos7840_get_port_private(port);
port0 = mos7840_get_port_private(serial->port[0]);
if (mos7840_port == NULL) {
if (mos7840_port == NULL || port0 == NULL)
return;
}
for (j = 0; j < NUM_URBS; ++j)
usb_kill_urb(mos7840_port->write_urb_pool[j]);
......@@ -1234,12 +1259,13 @@ static void mos7840_close(struct usb_serial_port *port, struct file *filp)
}
// if(mos7840_port->ctrl_buf != NULL)
// kfree(mos7840_port->ctrl_buf);
mos7840_num_open_ports--;
port0->open_ports--;
dbg("mos7840_num_open_ports in close%d:in port%d\n",
mos7840_num_open_ports, port->number);
if (mos7840_num_open_ports == 0) {
port0->open_ports, port->number);
if (port0->open_ports == 0) {
if (serial->port[0]->interrupt_in_urb) {
dbg("%s", "Shutdown interrupt_in_urb\n");
usb_kill_urb(serial->port[0]->interrupt_in_urb);
}
}
......@@ -1368,6 +1394,7 @@ static int mos7840_write_room(struct usb_serial_port *port)
{
int i;
int room = 0;
unsigned long flags;
struct moschip_port *mos7840_port;
dbg("%s \n", " mos7840_write_room:entering ...........");
......@@ -1384,14 +1411,17 @@ static int mos7840_write_room(struct usb_serial_port *port)
return -1;
}
spin_lock_irqsave(&mos7840_port->pool_lock, flags);
for (i = 0; i < NUM_URBS; ++i) {
if (mos7840_port->write_urb_pool[i]->status != -EINPROGRESS) {
if (!mos7840_port->busy[i]) {
room += URB_TRANSFER_BUFFER_SIZE;
}
}
spin_unlock_irqrestore(&mos7840_port->pool_lock, flags);
room = (room == 0) ? 0 : room - URB_TRANSFER_BUFFER_SIZE + 1;
dbg("%s - returns %d", __FUNCTION__, room);
return (room);
return room;
}
......@@ -1410,6 +1440,7 @@ static int mos7840_write(struct usb_serial_port *port,
int i;
int bytes_sent = 0;
int transfer_size;
unsigned long flags;
struct moschip_port *mos7840_port;
struct usb_serial *serial;
......@@ -1476,13 +1507,16 @@ static int mos7840_write(struct usb_serial_port *port,
/* try to find a free urb in the list */
urb = NULL;
spin_lock_irqsave(&mos7840_port->pool_lock, flags);
for (i = 0; i < NUM_URBS; ++i) {
if (mos7840_port->write_urb_pool[i]->status != -EINPROGRESS) {
if (!mos7840_port->busy[i]) {
mos7840_port->busy[i] = 1;
urb = mos7840_port->write_urb_pool[i];
dbg("\nURB:%d", i);
break;
}
}
spin_unlock_irqrestore(&mos7840_port->pool_lock, flags);
if (urb == NULL) {
dbg("%s - no more free urbs", __FUNCTION__);
......@@ -1518,6 +1552,7 @@ static int mos7840_write(struct usb_serial_port *port,
status = usb_submit_urb(urb, GFP_ATOMIC);
if (status) {
mos7840_port->busy[i] = 0;
err("%s - usb_submit_urb(write bulk) failed with status = %d",
__FUNCTION__, status);
bytes_sent = status;
......@@ -1525,6 +1560,7 @@ static int mos7840_write(struct usb_serial_port *port,
}
bytes_sent = transfer_size;
mos7840_port->icount.tx += transfer_size;
smp_wmb();
dbg("mos7840_port->icount.tx is %d:\n", mos7840_port->icount.tx);
exit:
......@@ -2490,6 +2526,7 @@ static int mos7840_ioctl(struct usb_serial_port *port, struct file *file,
if (signal_pending(current))
return -ERESTARTSYS;
cnow = mos7840_port->icount;
smp_rmb();
if (cnow.rng == cprev.rng && cnow.dsr == cprev.dsr &&
cnow.dcd == cprev.dcd && cnow.cts == cprev.cts)
return -EIO; /* no change => error */
......@@ -2506,6 +2543,7 @@ static int mos7840_ioctl(struct usb_serial_port *port, struct file *file,
case TIOCGICOUNT:
cnow = mos7840_port->icount;
smp_rmb();
icount.cts = cnow.cts;
icount.dsr = cnow.dsr;
icount.rng = cnow.rng;
......@@ -2535,19 +2573,18 @@ static int mos7840_ioctl(struct usb_serial_port *port, struct file *file,
static int mos7840_calc_num_ports(struct usb_serial *serial)
{
int mos7840_num_ports = 0;
dbg("numberofendpoints: %d \n",
(int)serial->interface->cur_altsetting->desc.bNumEndpoints);
dbg("numberofendpoints: %d \n",
(int)serial->interface->altsetting->desc.bNumEndpoints);
if (serial->interface->cur_altsetting->desc.bNumEndpoints == 5) {
mos7840_num_ports = 2;
serial->type->num_ports = 2;
mos7840_num_ports = serial->num_ports = 2;
} else if (serial->interface->cur_altsetting->desc.bNumEndpoints == 9) {
mos7840_num_ports = 4;
serial->type->num_bulk_in = 4;
serial->type->num_bulk_out = 4;
serial->type->num_ports = 4;
serial->num_bulk_in = 4;
serial->num_bulk_out = 4;
mos7840_num_ports = serial->num_ports = 4;
}
return mos7840_num_ports;
......@@ -2583,7 +2620,9 @@ static int mos7840_startup(struct usb_serial *serial)
mos7840_port = kzalloc(sizeof(struct moschip_port), GFP_KERNEL);
if (mos7840_port == NULL) {
err("%s - Out of memory", __FUNCTION__);
return -ENOMEM;
status = -ENOMEM;
i--; /* don't follow NULL pointer cleaning up */
goto error;
}
/* Initialize all port interrupt end point to port 0 int endpoint *
......@@ -2591,6 +2630,7 @@ static int mos7840_startup(struct usb_serial *serial)
mos7840_port->port = serial->port[i];
mos7840_set_port_private(serial->port[i], mos7840_port);
spin_lock_init(&mos7840_port->pool_lock);
mos7840_port->port_num = ((serial->port[i]->number -
(serial->port[i]->serial->minor)) +
......@@ -2601,22 +2641,22 @@ static int mos7840_startup(struct usb_serial *serial)
mos7840_port->ControlRegOffset = 0x1;
mos7840_port->DcrRegOffset = 0x4;
} else if ((mos7840_port->port_num == 2)
&& (mos7840_num_ports == 4)) {
&& (serial->num_ports == 4)) {
mos7840_port->SpRegOffset = 0x8;
mos7840_port->ControlRegOffset = 0x9;
mos7840_port->DcrRegOffset = 0x16;
} else if ((mos7840_port->port_num == 2)
&& (mos7840_num_ports == 2)) {
&& (serial->num_ports == 2)) {
mos7840_port->SpRegOffset = 0xa;
mos7840_port->ControlRegOffset = 0xb;
mos7840_port->DcrRegOffset = 0x19;
} else if ((mos7840_port->port_num == 3)
&& (mos7840_num_ports == 4)) {
&& (serial->num_ports == 4)) {
mos7840_port->SpRegOffset = 0xa;
mos7840_port->ControlRegOffset = 0xb;
mos7840_port->DcrRegOffset = 0x19;
} else if ((mos7840_port->port_num == 4)
&& (mos7840_num_ports == 4)) {
&& (serial->num_ports == 4)) {
mos7840_port->SpRegOffset = 0xc;
mos7840_port->ControlRegOffset = 0xd;
mos7840_port->DcrRegOffset = 0x1c;
......@@ -2701,21 +2741,19 @@ static int mos7840_startup(struct usb_serial *serial)
dbg("CLK_START_VALUE_REGISTER Writing success status%d\n", status);
Data = 0x20;
status = 0;
status =
mos7840_set_reg_sync(serial->port[i], CLK_MULTI_REGISTER,
Data);
if (status < 0) {
dbg("Writing CLK_MULTI_REGISTER failed status-0x%x\n",
status);
break;
goto error;
} else
dbg("CLK_MULTI_REGISTER Writing success status%d\n",
status);
//write value 0x0 to scratchpad register
Data = 0x00;
status = 0;
status =
mos7840_set_uart_reg(serial->port[i], SCRATCH_PAD_REGISTER,
Data);
......@@ -2729,7 +2767,7 @@ static int mos7840_startup(struct usb_serial *serial)
//Zero Length flag register
if ((mos7840_port->port_num != 1)
&& (mos7840_num_ports == 2)) {
&& (serial->num_ports == 2)) {
Data = 0xff;
status = 0;
......@@ -2770,14 +2808,17 @@ static int mos7840_startup(struct usb_serial *serial)
i + 1, status);
}
mos7840_port->control_urb = usb_alloc_urb(0, GFP_ATOMIC);
mos7840_port->control_urb = usb_alloc_urb(0, GFP_KERNEL);
mos7840_port->ctrl_buf = kmalloc(16, GFP_KERNEL);
mos7840_port->dr = kmalloc(sizeof(struct usb_ctrlrequest), GFP_KERNEL);
if (!mos7840_port->control_urb || !mos7840_port->ctrl_buf || !mos7840_port->dr) {
status = -ENOMEM;
goto error;
}
}
//Zero Length flag enable
Data = 0x0f;
status = 0;
status = mos7840_set_reg_sync(serial->port[0], ZLP_REG5, Data);
if (status < 0) {
dbg("Writing ZLP_REG5 failed status-0x%x\n", status);
......@@ -2789,6 +2830,17 @@ static int mos7840_startup(struct usb_serial *serial)
usb_control_msg(serial->dev, usb_sndctrlpipe(serial->dev, 0),
(__u8) 0x03, 0x00, 0x01, 0x00, NULL, 0x00, 5 * HZ);
return 0;
error:
for (/* nothing */; i >= 0; i--) {
mos7840_port = mos7840_get_port_private(serial->port[i]);
kfree(mos7840_port->dr);
kfree(mos7840_port->ctrl_buf);
usb_free_urb(mos7840_port->control_urb);
kfree(mos7840_port);
serial->port[i] = NULL;
}
return status;
}
/****************************************************************************
......@@ -2799,6 +2851,7 @@ static int mos7840_startup(struct usb_serial *serial)
static void mos7840_shutdown(struct usb_serial *serial)
{
int i;
unsigned long flags;
struct moschip_port *mos7840_port;
dbg("%s \n", " shutdown :entering..........");
......@@ -2814,8 +2867,12 @@ static void mos7840_shutdown(struct usb_serial *serial)
for (i = 0; i < serial->num_ports; ++i) {
mos7840_port = mos7840_get_port_private(serial->port[i]);
kfree(mos7840_port->ctrl_buf);
spin_lock_irqsave(&mos7840_port->pool_lock, flags);
mos7840_port->zombie = 1;
spin_unlock_irqrestore(&mos7840_port->pool_lock, flags);
usb_kill_urb(mos7840_port->control_urb);
kfree(mos7840_port->ctrl_buf);
kfree(mos7840_port->dr);
kfree(mos7840_port);
mos7840_set_port_private(serial->port[i], NULL);
}
......
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