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tty: Fix unsafe bit ops in tty_throttle_safe/unthrottle_safe 

tty->flags needs to be atomically modified.

Signed-off-by: Peter Hurley <peter@hurleysoftware.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Peter Hurley 2013-04-15 11:06:06 -04:00 committed by Greg Kroah-Hartman
parent 31815c08fc
commit 579a00a5c2
1 changed files with 2 additions and 2 deletions
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4
drivers/tty/tty_ioctl.c
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@ -156,7 +156,7 @@ int tty_throttle_safe(struct tty_struct *tty)
if (tty->flow_change != TTY_THROTTLE_SAFE) if (tty->flow_change != TTY_THROTTLE_SAFE)
ret = 1; ret = 1;
else { else {
__set_bit(TTY_THROTTLED, &tty->flags); set_bit(TTY_THROTTLED, &tty->flags);
if (tty->ops->throttle) if (tty->ops->throttle)
tty->ops->throttle(tty); tty->ops->throttle(tty);
} }
@ -187,7 +187,7 @@ int tty_unthrottle_safe(struct tty_struct *tty)
if (tty->flow_change != TTY_UNTHROTTLE_SAFE) if (tty->flow_change != TTY_UNTHROTTLE_SAFE)
ret = 1; ret = 1;
else { else {
__clear_bit(TTY_THROTTLED, &tty->flags); clear_bit(TTY_THROTTLED, &tty->flags);
if (tty->ops->unthrottle) if (tty->ops->unthrottle)
tty->ops->unthrottle(tty); tty->ops->unthrottle(tty);
} }