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tty: Introduce some close helpers for ports

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Again this is a lot of common code we can unify

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 13:46:50 +00:00
committed by Linus Torvalds
parent 7834909f1e
commit a6614999e8
11 changed files with 127 additions and 392 deletions
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58
drivers/char/synclink.c
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@@ -3104,70 +3104,18 @@ static void mgsl_close(struct tty_struct *tty, struct file * filp)
if (debug_level >= DEBUG_LEVEL_INFO)
printk("%s(%d):mgsl_close(%s) entry, count=%d\n",
__FILE__,__LINE__, info->device_name, info->port.count);
if (!info->port.count)
return;
if (tty_hung_up_p(filp))
if (tty_port_close_start(&info->port, tty, filp) == 0)
goto cleanup;
if ((tty->count == 1) && (info->port.count != 1)) {
/*
* tty->count is 1 and the tty structure will be freed.
* info->port.count should be one in this case.
* if it's not, correct it so that the port is shutdown.
*/
printk("mgsl_close: bad refcount; tty->count is 1, "
"info->port.count is %d\n", info->port.count);
info->port.count = 1;
}
info->port.count--;
/* if at least one open remaining, leave hardware active */
if (info->port.count)
goto cleanup;
info->port.flags |= ASYNC_CLOSING;
/* set tty->closing to notify line discipline to
* only process XON/XOFF characters. Only the N_TTY
* discipline appears to use this (ppp does not).
*/
tty->closing = 1;
/* wait for transmit data to clear all layers */
if (info->port.closing_wait != ASYNC_CLOSING_WAIT_NONE) {
if (debug_level >= DEBUG_LEVEL_INFO)
printk("%s(%d):mgsl_close(%s) calling tty_wait_until_sent\n",
__FILE__,__LINE__, info->device_name );
tty_wait_until_sent(tty, info->port.closing_wait);
}
if (info->port.flags & ASYNC_INITIALIZED)
mgsl_wait_until_sent(tty, info->timeout);
mgsl_flush_buffer(tty);
tty_ldisc_flush(tty);
shutdown(info);
tty->closing = 0;
tty_port_close_end(&info->port, tty);
info->port.tty = NULL;
if (info->port.blocked_open) {
if (info->port.close_delay) {
msleep_interruptible(jiffies_to_msecs(info->port.close_delay));
}
wake_up_interruptible(&info->port.open_wait);
}
info->port.flags &= ~(ASYNC_NORMAL_ACTIVE|ASYNC_CLOSING);
wake_up_interruptible(&info->port.close_wait);
cleanup:
if (debug_level >= DEBUG_LEVEL_INFO)
printk("%s(%d):mgsl_close(%s) exit, count=%d\n", __FILE__,__LINE__,