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tty_ioctl: locking for tty_wait_until_sent 

This function still depends on the big kernel lock in some cases.  Push
locking into the function ready for removal of the BKL from ioctl call paths.

Signed-off-by: Alan Cox <alan@redhat.com>
Cc: Andi Kleen <andi@firstfloor.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
This commit is contained in:
Alan Cox 2008-04-30 00:53:32 -07:00 committed by Linus Torvalds
parent 5d0fdf1e01
commit 0ee9cbb3c7
1 changed files with 7 additions and 4 deletions
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11
drivers/char/tty_ioctl.c
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@ -21,6 +21,7 @@
#include <linux/module.h>
#include <linux/bitops.h>
#include <linux/mutex.h>
#include <linux/smp_lock.h>
#include <asm/io.h>
#include <asm/uaccess.h>
@ -61,11 +62,13 @@ void tty_wait_until_sent(struct tty_struct *tty, long timeout)
return;
if (!timeout)
timeout = MAX_SCHEDULE_TIMEOUT;
lock_kernel();
if (wait_event_interruptible_timeout(tty->write_wait,
!tty->driver->chars_in_buffer(tty), timeout) < 0)
return;
if (tty->driver->wait_until_sent)
tty->driver->wait_until_sent(tty, timeout);
!tty->driver->chars_in_buffer(tty), timeout) >= 0) {
if (tty->driver->wait_until_sent)
tty->driver->wait_until_sent(tty, timeout);
}
unlock_kernel();
}
EXPORT_SYMBOL(tty_wait_until_sent);