From: Paul Fulghum <paulkf@microgate.com>
To: Marcelo Tosatti <marcelo.tosatti@cyclades.com>
Cc: linux-kernel <linux-kernel@vger.kernel.org>
Subject: [PATCH 2.4] serial send_break duration fix
Date: Thu, 21 Oct 2004 16:01:03 -0500 [thread overview]
Message-ID: <1098392462.3288.65.camel@deimos.microgate.com> (raw)
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 <paulkf@microgate.com>
--
Paul Fulghum
paulkf@microgate.com
--- linux-2.4.28-pre4/drivers/char/tty_io.c 2004-04-14 08:05:29.000000000 -0500
+++ b/drivers/char/tty_io.c 2004-10-21 15:55:40.516247240 -0500
@@ -1684,11 +1684,11 @@ 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;
reply other threads:[~2004-10-21 21:01 UTC|newest]
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