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tty: Redo the rocket driver locking

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Bring this driver into the port locking model

Signed-off-by: Alan Cox <alan@redhat.com>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
This commit is contained in:
Alan Cox
2009-01-02 13:48:17 +00:00
committed by Linus Torvalds
parent 6ed1dbaead
commit c1314a49d7
2 changed files with 20 additions and 24 deletions
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35
drivers/char/rocket.c
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@@ -920,7 +920,7 @@ static int block_til_ready(struct tty_struct *tty, struct file *filp,
#ifdef ROCKET_DEBUG_OPEN
printk(KERN_INFO "block_til_ready before block: ttyR%d, count = %d\n", info->line, port->count);
#endif
spin_lock_irqsave(&info->slock, flags);
spin_lock_irqsave(&port->lock, flags);
#ifdef ROCKET_DISABLE_SIMUSAGE
info->flags |= ASYNC_NORMAL_ACTIVE;
@@ -932,7 +932,7 @@ static int block_til_ready(struct tty_struct *tty, struct file *filp,
#endif
port->blocked_open++;
spin_unlock_irqrestore(&info->slock, flags);
spin_unlock_irqrestore(&port->lock, flags);
while (1) {
if (tty->termios->c_cflag & CBAUD)
@@ -961,13 +961,13 @@ static int block_til_ready(struct tty_struct *tty, struct file *filp,
__set_current_state(TASK_RUNNING);
remove_wait_queue(&port->open_wait, &wait);
spin_lock_irqsave(&info->slock, flags);
spin_lock_irqsave(&port->lock, flags);
if (extra_count)
port->count++;
port->blocked_open--;
spin_unlock_irqrestore(&info->slock, flags);
spin_unlock_irqrestore(&port->lock, flags);
#ifdef ROCKET_DEBUG_OPEN
printk(KERN_INFO "block_til_ready after blocking: ttyR%d, count = %d\n",
@@ -1095,6 +1095,7 @@ static int rp_open(struct tty_struct *tty, struct file *filp)
static void rp_close(struct tty_struct *tty, struct file *filp)
{
struct r_port *info = tty->driver_data;
struct tty_port *port = &info->port;
unsigned long flags;
int timeout;
CHANNEL_t *cp;
@@ -1108,9 +1109,9 @@ static void rp_close(struct tty_struct *tty, struct file *filp)
if (tty_hung_up_p(filp))
return;
spin_lock_irqsave(&info->slock, flags);
spin_lock_irqsave(&port->lock, flags);
if ((tty->count == 1) && (info->port.count != 1)) {
if (tty->count == 1 && port->count != 1) {
/*
* Uh, oh. tty->count is 1, which means that the tty
* structure will be freed. Info->count should always
@@ -1120,19 +1121,19 @@ static void rp_close(struct tty_struct *tty, struct file *filp)
*/
printk(KERN_WARNING "rp_close: bad serial port count; "
"tty->count is 1, info->port.count is %d\n", info->port.count);
info->port.count = 1;
port->count = 1;
}
if (--info->port.count < 0) {
if (--port->count < 0) {
printk(KERN_WARNING "rp_close: bad serial port count for "
"ttyR%d: %d\n", info->line, info->port.count);
info->port.count = 0;
port->count = 0;
}
if (info->port.count) {
spin_unlock_irqrestore(&info->slock, flags);
if (port->count) {
spin_unlock_irqrestore(&port->lock, flags);
return;
}
info->flags |= ASYNC_CLOSING;
spin_unlock_irqrestore(&info->slock, flags);
spin_unlock_irqrestore(&port->lock, flags);
cp = &info->channel;
@@ -1152,7 +1153,7 @@ static void rp_close(struct tty_struct *tty, struct file *filp)
* Wait for the transmit buffer to clear
*/
if (info->port.closing_wait != ASYNC_CLOSING_WAIT_NONE)
tty_wait_until_sent(tty, info->port.closing_wait);
tty_wait_until_sent(tty, port->closing_wait);
/*
* Before we drop DTR, make sure the UART transmitter
* has completely drained; this is especially
@@ -1181,11 +1182,11 @@ static void rp_close(struct tty_struct *tty, struct file *filp)
clear_bit((info->aiop * 8) + info->chan, (void *) &xmit_flags[info->board]);
if (info->port.blocked_open) {
if (info->port.close_delay) {
msleep_interruptible(jiffies_to_msecs(info->port.close_delay));
if (port->blocked_open) {
if (port->close_delay) {
msleep_interruptible(jiffies_to_msecs(port->close_delay));
}
wake_up_interruptible(&info->port.open_wait);
wake_up_interruptible(&port->open_wait);
} else {
if (info->xmit_buf) {
free_page((unsigned long) info->xmit_buf);