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Commit 2641cc66 authored by Russell King's avatar Russell King Committed by Linus Torvalds
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[SERIAL] Make tty->driver_data point at the uart_state structure. 

Since the uart_state structure is less volatile than uart_info, we
can safely place some semaphores in uart_state.
parent 28f23c1a
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Showing with 159 additions and 161 deletions
drivers/serial/core.c
View file @ 2641cc66
......@@ -73,8 +73,8 @@ void uart_write_wakeup(struct uart_port *port)
static void uart_stop(struct tty_struct *tty)
{
struct uart_info *info = tty->driver_data;
struct uart_port *port = info->port;
struct uart_state *state = tty->driver_data;
struct uart_port *port = state->port;
unsigned long flags;
spin_lock_irqsave(&port->lock, flags);
......@@ -84,24 +84,25 @@ static void uart_stop(struct tty_struct *tty)
static void __uart_start(struct tty_struct *tty)
{
struct uart_info *info = tty->driver_data;
struct uart_port *port = info->port;
struct uart_state *state = tty->driver_data;
struct uart_port *port = state->port;
if (!uart_circ_empty(&info->xmit) && info->xmit.buf &&
if (!uart_circ_empty(&state->info->xmit) && state->info->xmit.buf &&
!tty->stopped && !tty->hw_stopped)
port->ops->start_tx(port, 1);
}
static void uart_start(struct tty_struct *tty)
{
struct uart_info *info = tty->driver_data;
struct uart_state *state = tty->driver_data;
struct uart_port *port = state->port;
unsigned long flags;
pm_access(info->state->pm);
pm_access(state->pm);
spin_lock_irqsave(&info->port->lock, flags);
spin_lock_irqsave(&port->lock, flags);
__uart_start(tty);
spin_unlock_irqrestore(&info->port->lock, flags);
spin_unlock_irqrestore(&port->lock, flags);
}
static void uart_tasklet_action(unsigned long data)
......@@ -220,7 +221,7 @@ static void uart_shutdown(struct uart_info *info)
* Turn off DTR and RTS early.
*/
if (!info->tty || (info->tty->termios->c_cflag & HUPCL))
uart_clear_mctrl(info->port, TIOCM_DTR | TIOCM_RTS);
uart_clear_mctrl(port, TIOCM_DTR | TIOCM_RTS);
/*
* clear delta_msr_wait queue to avoid mem leaks: we may free
......@@ -526,10 +527,10 @@ __uart_kern_write(struct uart_port *port, struct circ_buf *circ,
static void uart_put_char(struct tty_struct *tty, unsigned char ch)
{
struct uart_info *info = tty->driver_data;
struct uart_state *state = tty->driver_data;
if (tty)
__uart_put_char(info->port, &info->xmit, ch);
__uart_put_char(state->port, &state->info->xmit, ch);
}
static void uart_flush_chars(struct tty_struct *tty)
......@@ -541,16 +542,16 @@ static int
uart_write(struct tty_struct *tty, int from_user, const unsigned char * buf,
int count)
{
struct uart_info *info = tty->driver_data;
struct uart_state *state = tty->driver_data;
int ret;
if (!tty || !info->xmit.buf)
if (!tty || !state->info->xmit.buf)
return 0;
if (from_user)
ret = __uart_user_write(info->port, &info->xmit, buf, count);
ret = __uart_user_write(state->port, &state->info->xmit, buf, count);
else
ret = __uart_kern_write(info->port, &info->xmit, buf, count);
ret = __uart_kern_write(state->port, &state->info->xmit, buf, count);
uart_start(tty);
return ret;
......@@ -558,29 +559,30 @@ uart_write(struct tty_struct *tty, int from_user, const unsigned char * buf,
static int uart_write_room(struct tty_struct *tty)
{
struct uart_info *info = tty->driver_data;
struct uart_state *state = tty->driver_data;
return uart_circ_chars_free(&info->xmit);
return uart_circ_chars_free(&state->info->xmit);
}
static int uart_chars_in_buffer(struct tty_struct *tty)
{
struct uart_info *info = tty->driver_data;
struct uart_state *state = tty->driver_data;
return uart_circ_chars_pending(&info->xmit);
return uart_circ_chars_pending(&state->info->xmit);
}
static void uart_flush_buffer(struct tty_struct *tty)
{
struct uart_info *info = tty->driver_data;
struct uart_state *state = tty->driver_data;
struct uart_port *port = state->port;
unsigned long flags;
DPRINTK("uart_flush_buffer(%d) called\n",
minor(tty->device) - tty->driver.minor_start);
spin_lock_irqsave(&info->port->lock, flags);
uart_circ_clear(&info->xmit);
spin_unlock_irqrestore(&info->port->lock, flags);
spin_lock_irqsave(&port->lock, flags);
uart_circ_clear(&state->info->xmit);
spin_unlock_irqrestore(&port->lock, flags);
wake_up_interruptible(&tty->write_wait);
if ((tty->flags & (1 << TTY_DO_WRITE_WAKEUP)) &&
tty->ldisc.write_wakeup)
......@@ -593,8 +595,8 @@ static void uart_flush_buffer(struct tty_struct *tty)
*/
static void uart_send_xchar(struct tty_struct *tty, char ch)
{
struct uart_info *info = tty->driver_data;
struct uart_port *port = info->port;
struct uart_state *state = tty->driver_data;
struct uart_port *port = state->port;
unsigned long flags;
if (port->ops->send_xchar)
......@@ -611,19 +613,19 @@ static void uart_send_xchar(struct tty_struct *tty, char ch)
static void uart_throttle(struct tty_struct *tty)
{
struct uart_info *info = tty->driver_data;
struct uart_state *state = tty->driver_data;
if (I_IXOFF(tty))
uart_send_xchar(tty, STOP_CHAR(tty));
if (tty->termios->c_cflag & CRTSCTS)
uart_clear_mctrl(info->port, TIOCM_RTS);
uart_clear_mctrl(state->port, TIOCM_RTS);
}
static void uart_unthrottle(struct tty_struct *tty)
{
struct uart_info *info = tty->driver_data;
struct uart_port *port = info->port;
struct uart_state *state = tty->driver_data;
struct uart_port *port = state->port;
if (I_IXOFF(tty)) {
if (port->x_char)
......@@ -636,10 +638,9 @@ static void uart_unthrottle(struct tty_struct *tty)
uart_set_mctrl(port, TIOCM_RTS);
}
static int uart_get_info(struct uart_info *info, struct serial_struct *retinfo)
static int uart_get_info(struct uart_state *state, struct serial_struct *retinfo)
{
struct uart_state *state = info->state;
struct uart_port *port = info->port;
struct uart_port *port = state->port;
struct serial_struct tmp;
memset(&tmp, 0, sizeof(tmp));
......@@ -649,7 +650,7 @@ static int uart_get_info(struct uart_info *info, struct serial_struct *retinfo)
if (HIGH_BITS_OFFSET)
tmp.port_high = (long) port->iobase >> HIGH_BITS_OFFSET;
tmp.irq = port->irq;
tmp.flags = port->flags | info->flags;
tmp.flags = port->flags;
tmp.xmit_fifo_size = port->fifosize;
tmp.baud_base = port->uartclk / 16;
tmp.close_delay = state->close_delay;
......@@ -666,11 +667,10 @@ static int uart_get_info(struct uart_info *info, struct serial_struct *retinfo)
}
static int
uart_set_info(struct uart_info *info, struct serial_struct *newinfo)
uart_set_info(struct uart_state *state, struct serial_struct *newinfo)
{
struct serial_struct new_serial;
struct uart_state *state = info->state;
struct uart_port *port = info->port;
struct uart_port *port = state->port;
unsigned long new_port;
unsigned int change_irq, change_port, old_flags;
unsigned int old_custom_divisor;
......@@ -745,14 +745,14 @@ uart_set_info(struct uart_info *info, struct serial_struct *newinfo)
/*
* Make sure that we are the sole user of this port.
*/
if (state->count > 1 || info->blocked_open != 0)
if (state->count > 1 || state->info->blocked_open != 0)
goto exit;
/*
* We need to shutdown the serial port at the old
* port/type/irq combination.
*/
uart_shutdown(info);
uart_shutdown(state->info);
}
if (change_port) {
......@@ -818,13 +818,15 @@ uart_set_info(struct uart_info *info, struct serial_struct *newinfo)
state->close_delay = new_serial.close_delay * HZ / 100;
state->closing_wait = new_serial.closing_wait * HZ / 100;
port->fifosize = new_serial.xmit_fifo_size;
info->tty->low_latency = (port->flags & UPF_LOW_LATENCY) ? 1 : 0;
if (state->info && state->info->tty)
state->info->tty->low_latency =
(port->flags & UPF_LOW_LATENCY) ? 1 : 0;
check_and_exit:
retval = 0;
if (port->type == PORT_UNKNOWN)
goto exit;
if (info->flags & UIF_INITIALIZED) {
if (state->info && state->info->flags & UIF_INITIALIZED) {
if (((old_flags ^ port->flags) & UPF_SPD_MASK) ||
old_custom_divisor != port->custom_divisor) {
/* If they're setting up a custom divisor or speed,
......@@ -832,13 +834,13 @@ uart_set_info(struct uart_info *info, struct serial_struct *newinfo)
* need to rate-limit; it's CAP_SYS_ADMIN only. */
if (port->flags & UPF_SPD_MASK) {
printk(KERN_NOTICE "%s sets custom speed on %s%d. This is deprecated.\n",
current->comm, info->tty->driver.name,
info->port->line);
current->comm, state->info->tty->driver.name,
state->port->line);
}
uart_change_speed(info, NULL);
uart_change_speed(state->info, NULL);
}
} else
retval = uart_startup(info, 1);
retval = uart_startup(state->info, 1);
exit:
up(&port_sem);
return retval;
......@@ -848,9 +850,9 @@ uart_set_info(struct uart_info *info, struct serial_struct *newinfo)
/*
* uart_get_lsr_info - get line status register info
*/
static int uart_get_lsr_info(struct uart_info *info, unsigned int *value)
static int uart_get_lsr_info(struct uart_state *state, unsigned int *value)
{
struct uart_port *port = info->port;
struct uart_port *port = state->port;
unsigned int result;
result = port->ops->tx_empty(port);
......@@ -861,9 +863,9 @@ static int uart_get_lsr_info(struct uart_info *info, unsigned int *value)
* avoid a race condition (depending on when the transmit
* interrupt happens).
*/
if (info->port->x_char ||
((uart_circ_chars_pending(&info->xmit) > 0) &&
!info->tty->stopped && !info->tty->hw_stopped))
if (port->x_char ||
((uart_circ_chars_pending(&state->info->xmit) > 0) &&
!state->info->tty->stopped && !state->info->tty->hw_stopped))
result &= ~TIOCSER_TEMT;
return put_user(result, value);
......@@ -911,8 +913,8 @@ uart_set_modem_info(struct uart_port *port, unsigned int cmd,
static void uart_break_ctl(struct tty_struct *tty, int break_state)
{
struct uart_info *info = tty->driver_data;
struct uart_port *port = info->port;
struct uart_state *state = tty->driver_data;
struct uart_port *port = state->port;
BUG_ON(!kernel_locked());
......@@ -920,9 +922,9 @@ static void uart_break_ctl(struct tty_struct *tty, int break_state)
port->ops->break_ctl(port, break_state);
}
static int uart_do_autoconfig(struct uart_info *info)
static int uart_do_autoconfig(struct uart_state *state)
{
struct uart_port *port = info->port;
struct uart_port *port = state->port;
int flags, ret;
if (!capable(CAP_SYS_ADMIN))
......@@ -937,8 +939,8 @@ static int uart_do_autoconfig(struct uart_info *info)
return -ERESTARTSYS;
ret = -EBUSY;
if (info->state->count == 1 && info->blocked_open == 0) {
uart_shutdown(info);
if (state->count == 1 && state->info->blocked_open == 0) {
uart_shutdown(state->info);
/*
* If we already have a port type configured,
......@@ -957,16 +959,16 @@ static int uart_do_autoconfig(struct uart_info *info)
*/
port->ops->config_port(port, flags);
ret = uart_startup(info, 1);
ret = uart_startup(state->info, 1);
}
up(&port_sem);
return ret;
}
static int
uart_wait_modem_status(struct uart_info *info, unsigned long arg)
uart_wait_modem_status(struct uart_state *state, unsigned long arg)
{
struct uart_port *port = info->port;
struct uart_port *port = state->port;
DECLARE_WAITQUEUE(wait, current);
struct uart_icount cprev, cnow;
int ret;
......@@ -983,7 +985,7 @@ uart_wait_modem_status(struct uart_info *info, unsigned long arg)
port->ops->enable_ms(port);
spin_unlock_irq(&port->lock);
add_wait_queue(&info->delta_msr_wait, &wait);
add_wait_queue(&state->info->delta_msr_wait, &wait);
for (;;) {
spin_lock_irq(&port->lock);
memcpy(&cnow, &port->icount, sizeof(struct uart_icount));
......@@ -1011,7 +1013,7 @@ uart_wait_modem_status(struct uart_info *info, unsigned long arg)
}
current->state = TASK_RUNNING;
remove_wait_queue(&info->delta_msr_wait, &wait);
remove_wait_queue(&state->info->delta_msr_wait, &wait);
return ret;
}
......@@ -1023,7 +1025,7 @@ static int
uart_ioctl(struct tty_struct *tty, struct file *file, unsigned int cmd,
unsigned long arg)
{
struct uart_info *info = tty->driver_data;
struct uart_state *state = tty->driver_data;
struct serial_icounter_struct icount;
struct uart_icount cnow;
int ret = -ENOIOCTLCMD;
......@@ -1039,31 +1041,31 @@ uart_ioctl(struct tty_struct *tty, struct file *file, unsigned int cmd,
switch (cmd) {
case TIOCMGET:
ret = uart_get_modem_info(info->port,
ret = uart_get_modem_info(state->port,
(unsigned int *)arg);
break;
case TIOCMBIS:
case TIOCMBIC:
case TIOCMSET:
ret = uart_set_modem_info(info->port, cmd,
ret = uart_set_modem_info(state->port, cmd,
(unsigned int *)arg);
break;
case TIOCGSERIAL:
ret = uart_get_info(info, (struct serial_struct *)arg);
ret = uart_get_info(state, (struct serial_struct *)arg);
break;
case TIOCSSERIAL:
ret = uart_set_info(info, (struct serial_struct *)arg);
ret = uart_set_info(state, (struct serial_struct *)arg);
break;
case TIOCSERCONFIG:
ret = uart_do_autoconfig(info);
ret = uart_do_autoconfig(state);
break;
case TIOCSERGETLSR: /* Get line status register */
ret = uart_get_lsr_info(info, (unsigned int *)arg);
ret = uart_get_lsr_info(state, (unsigned int *)arg);
break;
/*
......@@ -1073,7 +1075,7 @@ uart_ioctl(struct tty_struct *tty, struct file *file, unsigned int cmd,
* Caller should use TIOCGICOUNT to see which one it was
*/
case TIOCMIWAIT:
ret = uart_wait_modem_status(info, arg);
ret = uart_wait_modem_status(state, arg);
break;
/*
......@@ -1083,10 +1085,10 @@ uart_ioctl(struct tty_struct *tty, struct file *file, unsigned int cmd,
* RI where only 0->1 is counted.
*/
case TIOCGICOUNT:
spin_lock_irq(&info->port->lock);
memcpy(&cnow, &info->port->icount,
spin_lock_irq(&state->port->lock);
memcpy(&cnow, &state->port->icount,
sizeof(struct uart_icount));
spin_unlock_irq(&info->port->lock);
spin_unlock_irq(&state->port->lock);
icount.cts = cnow.cts;
icount.dsr = cnow.dsr;
......@@ -1110,7 +1112,7 @@ uart_ioctl(struct tty_struct *tty, struct file *file, unsigned int cmd,
break;
default: {
struct uart_port *port = info->port;
struct uart_port *port = state->port;
if (port->ops->ioctl)
ret = port->ops->ioctl(port, cmd, arg);
break;
......@@ -1121,7 +1123,7 @@ uart_ioctl(struct tty_struct *tty, struct file *file, unsigned int cmd,
static void uart_set_termios(struct tty_struct *tty, struct termios *old_termios)
{
struct uart_info *info = tty->driver_data;
struct uart_state *state = tty->driver_data;
unsigned long flags;
unsigned int cflag = tty->termios->c_cflag;
......@@ -1137,11 +1139,11 @@ static void uart_set_termios(struct tty_struct *tty, struct termios *old_termios
RELEVANT_IFLAG(tty->termios->c_iflag ^ old_termios->c_iflag) == 0)
return;
uart_change_speed(info, old_termios);
uart_change_speed(state->info, old_termios);
/* Handle transition to B0 status */
if ((old_termios->c_cflag & CBAUD) && !(cflag & CBAUD))
uart_clear_mctrl(info->port, TIOCM_RTS | TIOCM_DTR);
uart_clear_mctrl(state->port, TIOCM_RTS | TIOCM_DTR);
/* Handle transition away from B0 status */
if (!(old_termios->c_cflag & CBAUD) && (cflag & CBAUD)) {
......@@ -1149,15 +1151,15 @@ static void uart_set_termios(struct tty_struct *tty, struct termios *old_termios
if (!(cflag & CRTSCTS) ||
!test_bit(TTY_THROTTLED, &tty->flags))
mask |= TIOCM_RTS;
uart_set_mctrl(info->port, mask);
uart_set_mctrl(state->port, mask);
}
/* Handle turning off CRTSCTS */
if ((old_termios->c_cflag & CRTSCTS) && !(cflag & CRTSCTS)) {
spin_lock_irqsave(&info->port->lock, flags);
spin_lock_irqsave(&state->port->lock, flags);
tty->hw_stopped = 0;
__uart_start(tty);
spin_unlock_irqrestore(&info->port->lock, flags);
spin_unlock_irqrestore(&state->port->lock, flags);
}
#if 0
......@@ -1169,7 +1171,7 @@ static void uart_set_termios(struct tty_struct *tty, struct termios *old_termios
*/
if (!(old_termios->c_cflag & CLOCAL) &&
(tty->termios->c_cflag & CLOCAL))
wake_up_interruptible(&info->open_wait);
wake_up_interruptible(&state->info->open_wait);
#endif
}
......@@ -1180,19 +1182,15 @@ static void uart_set_termios(struct tty_struct *tty, struct termios *old_termios
*/
static void uart_close(struct tty_struct *tty, struct file *filp)
{
struct uart_driver *drv = (struct uart_driver *)tty->driver.driver_state;
struct uart_info *info = tty->driver_data;
struct uart_port *port = info->port;
struct uart_state *state;
struct uart_state *state = tty->driver_data;
struct uart_port *port = state->port;
unsigned long flags;
BUG_ON(!kernel_locked());
if (!info)
if (!state->info)
return;
state = info->state;
DPRINTK("uart_close() called\n");
/*
......@@ -1202,7 +1200,7 @@ static void uart_close(struct tty_struct *tty, struct file *filp)
if (tty_hung_up_p(filp))
goto done;
spin_lock_irqsave(&info->port->lock, flags);
spin_lock_irqsave(&state->port->lock, flags);
if ((tty->count == 1) && (state->count != 1)) {
/*
* Uh, oh. tty->count is 1, which means that the tty
......@@ -1217,11 +1215,11 @@ static void uart_close(struct tty_struct *tty, struct file *filp)
}
if (--state->count < 0) {
printk("rs_close: bad serial port count for %s%d: %d\n",
tty->driver.name, info->port->line, state->count);
tty->driver.name, port->line, state->count);
state->count = 0;
}
if (state->count) {
spin_unlock_irqrestore(&info->port->lock, flags);
spin_unlock_irqrestore(&state->port->lock, flags);
goto done;
}
......@@ -1229,22 +1227,22 @@ static void uart_close(struct tty_struct *tty, struct file *filp)
* The UIF_CLOSING flag protects us against further opens
* of this port.
*/
info->flags |= UIF_CLOSING;
spin_unlock_irqrestore(&info->port->lock, flags);
state->info->flags |= UIF_CLOSING;
spin_unlock_irqrestore(&state->port->lock, flags);
/*
* Now we wait for the transmit buffer to clear; and we notify
* the line discipline to only process XON/XOFF characters.
*/
tty->closing = 1;
if (info->state->closing_wait != USF_CLOSING_WAIT_NONE)
tty_wait_until_sent(tty, info->state->closing_wait);
if (state->closing_wait != USF_CLOSING_WAIT_NONE)
tty_wait_until_sent(tty, state->closing_wait);
/*
* At this point, we stop accepting input. To do this, we
* disable the receive line status interrupts.
*/
if (info->flags & UIF_INITIALIZED) {
if (state->info->flags & UIF_INITIALIZED) {
spin_lock_irqsave(&port->lock, flags);
port->ops->stop_rx(port);
spin_unlock_irqrestore(&port->lock, flags);
......@@ -1256,17 +1254,17 @@ static void uart_close(struct tty_struct *tty, struct file *filp)
uart_wait_until_sent(tty, port->timeout);
}
down(&port_sem);
uart_shutdown(info);
uart_shutdown(state->info);
up(&port_sem);
uart_flush_buffer(tty);
if (tty->ldisc.flush_buffer)
tty->ldisc.flush_buffer(tty);
tty->closing = 0;
info->tty = NULL;
if (info->blocked_open) {
if (info->state->close_delay) {
state->info->tty = NULL;
if (state->info->blocked_open) {
if (state->close_delay) {
set_current_state(TASK_INTERRUPTIBLE);
schedule_timeout(info->state->close_delay);
schedule_timeout(state->close_delay);
set_current_state(TASK_RUNNING);
}
} else {
......@@ -1274,7 +1272,7 @@ static void uart_close(struct tty_struct *tty, struct file *filp)
/*
* Put device into D3 state.
*/
pm_send(info->state->pm, PM_SUSPEND, (void *)3);
pm_send(state->pm, PM_SUSPEND, (void *)3);
#else
if (port->ops->pm)
port->ops->pm(port, 3, 0);
......@@ -1284,8 +1282,8 @@ static void uart_close(struct tty_struct *tty, struct file *filp)
/*
* Wake up anyone trying to open this port.
*/
info->flags &= ~(UIF_NORMAL_ACTIVE|UIF_CLOSING);
wake_up_interruptible(&info->open_wait);
state->info->flags &= ~(UIF_NORMAL_ACTIVE|UIF_CLOSING);
wake_up_interruptible(&state->info->open_wait);
done:
;
......@@ -1293,8 +1291,8 @@ static void uart_close(struct tty_struct *tty, struct file *filp)
static void uart_wait_until_sent(struct tty_struct *tty, int timeout)
{
struct uart_info *info = tty->driver_data;
struct uart_port *port = info->port;
struct uart_state *state = tty->driver_data;
struct uart_port *port = state->port;
unsigned long char_time, expire;
BUG_ON(!kernel_locked());
......@@ -1358,23 +1356,22 @@ static void uart_wait_until_sent(struct tty_struct *tty, int timeout)
*/
static void uart_hangup(struct tty_struct *tty)
{
struct uart_info *info = tty->driver_data;
struct uart_state *state = info->state;
struct uart_state *state = tty->driver_data;
BUG_ON(!kernel_locked());
uart_flush_buffer(tty);
down(&port_sem);
if (info->flags & UIF_CLOSING) {
if (state->info->flags & UIF_CLOSING) {
up(&port_sem);
return;
}
uart_shutdown(info);
uart_shutdown(state->info);
state->count = 0;
info->flags &= ~UIF_NORMAL_ACTIVE;
info->tty = NULL;
state->info->flags &= ~UIF_NORMAL_ACTIVE;
state->info->tty = NULL;
up(&port_sem);
wake_up_interruptible(&info->open_wait);
wake_up_interruptible(&state->info->open_wait);
}
/*
......@@ -1416,11 +1413,11 @@ static void uart_update_termios(struct uart_info *info)
}
static int
uart_block_til_ready(struct file *filp, struct uart_info *info)
uart_block_til_ready(struct file *filp, struct uart_state *state)
{
DECLARE_WAITQUEUE(wait, current);
struct uart_state *state = info->state;
struct uart_port *port = info->port;
struct uart_info *info = state->info;
struct uart_port *port = state->port;
info->blocked_open++;
state->count--;
......@@ -1470,7 +1467,7 @@ uart_block_til_ready(struct file *filp, struct uart_info *info)
* the data from the modem.
*/
if (info->tty->termios->c_cflag & CBAUD)
uart_set_mctrl(info->port, TIOCM_DTR);
uart_set_mctrl(port, TIOCM_DTR);
/*
* and wait for the carrier to indicate that the
......@@ -1504,42 +1501,44 @@ uart_block_til_ready(struct file *filp, struct uart_info *info)
return 0;
}
static struct uart_info *uart_get(struct uart_driver *drv, int line)
static struct uart_state *uart_get(struct uart_driver *drv, int line)
{
struct uart_state *state = drv->state + line;
struct uart_info *info = NULL;
struct uart_state *state;
down(&port_sem);
if (!state->port)
goto out;
state = drv->state + line;
state->count++;
info = state->info;
if (!state->port) {
up(&port_sem);
state->count--;
return ERR_PTR(-ENXIO);
}
if (!info) {
info = kmalloc(sizeof(struct uart_info), GFP_KERNEL);
if (info) {
memset(info, 0, sizeof(struct uart_info));
init_waitqueue_head(&info->open_wait);
init_waitqueue_head(&info->delta_msr_wait);
if (!state->info) {
state->info = kmalloc(sizeof(struct uart_info), GFP_KERNEL);
if (state->info) {
memset(state->info, 0, sizeof(struct uart_info));
init_waitqueue_head(&state->info->open_wait);
init_waitqueue_head(&state->info->delta_msr_wait);
/*
* Link the info into the other structures.
*/
info->port = state->port;
info->state = state;
state->port->info = info;
state->port->info = state->info;
state->info->port = state->port;
state->info->state = state;
tasklet_init(&info->tlet, uart_tasklet_action,
(unsigned long)info);
state->info = info;
} else
tasklet_init(&state->info->tlet, uart_tasklet_action,
(unsigned long)state->info);
up(&port_sem);
} else {
state->count--;
up(&port_sem);
return ERR_PTR(-ENOMEM);
}
}
out:
up(&port_sem);
return info;
return state;
}
/*
......@@ -1555,7 +1554,7 @@ static struct uart_info *uart_get(struct uart_driver *drv, int line)
static int uart_open(struct tty_struct *tty, struct file *filp)
{
struct uart_driver *drv = (struct uart_driver *)tty->driver.driver_state;
struct uart_info *info;
struct uart_state *state;
int retval, line = minor(tty->device) - tty->driver.minor_start;
BUG_ON(!kernel_locked());
......@@ -1575,28 +1574,29 @@ static int uart_open(struct tty_struct *tty, struct file *filp)
* FIXME: This one isn't fun. We can't guarantee that the tty isn't
* already in open, nor can we guarantee the state of tty->driver_data
*/
info = uart_get(drv, line);
retval = -ENOMEM;
if (!info)
state = uart_get(drv, line);
if (IS_ERR(state)) {
retval = PTR_ERR(state);
goto fail;
}
/*
* Once we set tty->driver_data here, we are guaranteed that
* uart_close() will decrement the driver module use count.
* Any failures from here onwards should not touch the count.
*/
tty->driver_data = info;
tty->low_latency = (info->port->flags & UPF_LOW_LATENCY) ? 1 : 0;
tty->driver_data = state;
tty->low_latency = (state->port->flags & UPF_LOW_LATENCY) ? 1 : 0;
tty->alt_speed = 0;
info->tty = tty;
state->info->tty = tty;
/*
* If the port is in the middle of closing, bail out now.
*/
if (tty_hung_up_p(filp) || (info->flags & UIF_CLOSING)) {
wait_event_interruptible(info->open_wait,
!(info->flags & UIF_CLOSING));
retval = (info->port->flags & UPF_HUP_NOTIFY) ?
if (tty_hung_up_p(filp) || (state->info->flags & UIF_CLOSING)) {
wait_event_interruptible(state->info->open_wait,
!(state->info->flags & UIF_CLOSING));
retval = (state->port->flags & UPF_HUP_NOTIFY) ?
-EAGAIN : -ERESTARTSYS;
goto fail;
}
......@@ -1604,11 +1604,11 @@ static int uart_open(struct tty_struct *tty, struct file *filp)
/*
* Make sure the device is in D0 state.
*/
if (info->state->count == 1) {
if (state->count == 1) {
#ifdef CONFIG_PM
pm_send(info->state->pm, PM_RESUME, (void *)0);
pm_send(state->pm, PM_RESUME, (void *)0);
#else
struct uart_port *port = info->port;
struct uart_port *port = state->port;
if (port->ops->pm)
port->ops->pm(port, 0, 3);
#endif
......@@ -1620,7 +1620,7 @@ static int uart_open(struct tty_struct *tty, struct file *filp)
* we sleep while requesting an IRQ.
*/
down(&port_sem);
retval = uart_startup(info, 0);
retval = uart_startup(state->info, 0);
up(&port_sem);
if (retval)
goto fail;
......@@ -1628,19 +1628,17 @@ static int uart_open(struct tty_struct *tty, struct file *filp)
/*
* Wait until the port is ready.
*/
retval = uart_block_til_ready(filp, info);
retval = uart_block_til_ready(filp, state);
/*
* If this is the first open to succeed, adjust things to suit.
*/
if (retval == 0 && !(info->flags & UIF_NORMAL_ACTIVE)) {
info->flags |= UIF_NORMAL_ACTIVE;
if (retval == 0 && !(state->info->flags & UIF_NORMAL_ACTIVE)) {
state->info->flags |= UIF_NORMAL_ACTIVE;
uart_update_termios(info);
uart_update_termios(state->info);
}
return retval;
fail:
return retval;
}
......
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