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tty: add throttle/unthrottle helpers

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Something Arjan suggested which allows us to clean up the code nicely

Signed-off-by: Alan Cox <alan@redhat.com>
Cc: Arjan van de Ven <arjan@infradead.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 00:54:18 -07:00
committed by Linus Torvalds
parent 8cd64518a3
commit 39c2e60f8c
9 changed files with 31 additions and 25 deletions
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16
drivers/char/tty_ioctl.c
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@@ -67,6 +67,22 @@ void tty_driver_flush_buffer(struct tty_struct *tty)
EXPORT_SYMBOL(tty_driver_flush_buffer);
void tty_throttle(struct tty_struct *tty)
{
/* check TTY_THROTTLED first so it indicates our state */
if (!test_and_set_bit(TTY_THROTTLED, &tty->flags) &&
tty->ops->throttle)
tty->ops->throttle(tty);
}
EXPORT_SYMBOL(tty_throttle);
void tty_unthrottle(struct tty_struct *tty)
{
if (test_and_clear_bit(TTY_THROTTLED, &tty->flags) &&
tty->ops->unthrottle)
tty->ops->unthrottle(tty);
}
EXPORT_SYMBOL(tty_unthrottle);
/**
* tty_wait_until_sent - wait for I/O to finish