Fix tty_io.c send_break() to assert break for proper duration.
If driver break_ctl() changes task state, then break may end
prematurely. USB serial driver break_ctl() sends a URB,
changing task state to TASK_RUNNING.
Signed-off-by: Paul Fulghum <[email protected]>
--- linux-2.6.8/drivers/char/tty_io.c 2004-08-14 00:37:15.000000000 -0500
+++ b/drivers/char/tty_io.c 2004-10-20 21:31:55.000000000 -0500
@@ -1703,11 +1703,11 @@ static int tiocsetd(struct tty_struct *t
static int send_break(struct tty_struct *tty, int duration)
{
- set_current_state(TASK_INTERRUPTIBLE);
-
tty->driver->break_ctl(tty, -1);
- if (!signal_pending(current))
+ if (!signal_pending(current)) {
+ set_current_state(TASK_INTERRUPTIBLE);
schedule_timeout(duration);
+ }
tty->driver->break_ctl(tty, 0);
if (signal_pending(current))
return -EINTR;