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cyclades: close cleanup

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Use new tty helpers for close, which allows much code removal.

The only real change is locking. card_lock for protecting was
used inappropriately (just to have a critical section, no matter
which lock is used), so the change to port->lock is fine.

Remove also useless debug printks while being there.

Signed-off-by: Jiri Slaby <jirislaby@gmail.com>
Signed-off-by: Alan Cox <alan@linux.intel.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
This commit is contained in:
Jiri Slaby 2009-09-19 13:13:13 -07:00 committed by Live-CD User
parent 174e6fe01e
commit 2334226296
1 changed files with 2 additions and 68 deletions
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70
drivers/char/cyclades.c
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@ -2361,61 +2361,13 @@ static void cy_close(struct tty_struct *tty, struct file *filp)
struct cyclades_card *card;
unsigned long flags;
#ifdef CY_DEBUG_OTHER
printk(KERN_DEBUG "cyc:cy_close ttyC%d\n", info->line);
#endif
if (!info || serial_paranoia_check(info, tty->name, "cy_close"))
return;
card = info->card;
spin_lock_irqsave(&card->card_lock, flags);
/* If the TTY is being hung up, nothing to do */
if (tty_hung_up_p(filp)) {
spin_unlock_irqrestore(&card->card_lock, flags);
if (!tty_port_close_start(&info->port, tty, filp))
return;
}
#ifdef CY_DEBUG_OPEN
printk(KERN_DEBUG "cyc:cy_close ttyC%d, count = %d\n", info->line,
info->port.count);
#endif
if ((tty->count == 1) && (info->port.count != 1)) {
/*
* Uh, oh. tty->count is 1, which means that the tty
* structure will be freed. Info->count should always
* be one in these conditions. If it's greater than
* one, we've got real problems, since it means the
* serial port won't be shutdown.
*/
printk(KERN_ERR "cyc:cy_close: bad serial port count; "
"tty->count is 1, info->port.count is %d\n", info->port.count);
info->port.count = 1;
}
#ifdef CY_DEBUG_COUNT
printk(KERN_DEBUG "cyc:cy_close at (%d): decrementing count to %d\n",
current->pid, info->port.count - 1);
#endif
if (--info->port.count < 0) {
#ifdef CY_DEBUG_COUNT
printk(KERN_DEBUG "cyc:cyc_close setting count to 0\n");
#endif
info->port.count = 0;
}
if (info->port.count) {
spin_unlock_irqrestore(&card->card_lock, flags);
return;
}
info->port.flags |= ASYNC_CLOSING;
/*
* Now we wait for the transmit buffer to clear; and we notify
* the line discipline to only process XON/XOFF characters.
*/
tty->closing = 1;
spin_unlock_irqrestore(&card->card_lock, flags);
if (info->port.closing_wait != CY_CLOSING_WAIT_NONE)
tty_wait_until_sent(tty, info->port.closing_wait);
spin_lock_irqsave(&card->card_lock, flags);
@ -2460,28 +2412,10 @@ static void cy_close(struct tty_struct *tty, struct file *filp)
spin_unlock_irqrestore(&card->card_lock, flags);
cy_shutdown(info, tty);
cy_flush_buffer(tty);
tty_ldisc_flush(tty);
spin_lock_irqsave(&card->card_lock, flags);
tty->closing = 0;
tty_port_tty_set(&info->port, NULL);
if (info->port.blocked_open) {
spin_unlock_irqrestore(&card->card_lock, flags);
if (info->port.close_delay) {
msleep_interruptible(jiffies_to_msecs
(info->port.close_delay));
}
wake_up_interruptible(&info->port.open_wait);
spin_lock_irqsave(&card->card_lock, flags);
}
info->port.flags &= ~(ASYNC_NORMAL_ACTIVE | ASYNC_CLOSING);
wake_up_interruptible(&info->port.close_wait);
#ifdef CY_DEBUG_OTHER
printk(KERN_DEBUG "cyc:cy_close done\n");
#endif
spin_unlock_irqrestore(&card->card_lock, flags);
tty_port_close_end(&info->port, tty);
} /* cy_close */
/* This routine gets called when tty_write has put something into