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authorBenjamin Herrenschmidt <benh@kernel.crashing.org>2009-08-27 13:12:40 +1000
committerBenjamin Herrenschmidt <benh@kernel.crashing.org>2009-08-27 13:12:40 +1000
commitf480fe3916de2e2cbb6e384cb685f0f1d8272188 (patch)
tree141c60a2a263f1c01907e692d4aef1e6b699d8c7 /drivers/char
parent4f0dbc2781b9dc457159b676289f874ab2dc3560 (diff)
parentf415c413f458837bd0c27086b79aca889f9435e4 (diff)
Merge commit 'origin/master' into next
Diffstat (limited to 'drivers/char')
-rw-r--r--drivers/char/tty_ldisc.c10
1 files changed, 7 insertions, 3 deletions
diff --git a/drivers/char/tty_ldisc.c b/drivers/char/tty_ldisc.c
index 1733d3439ad..e48af9f7921 100644
--- a/drivers/char/tty_ldisc.c
+++ b/drivers/char/tty_ldisc.c
@@ -508,8 +508,9 @@ static void tty_ldisc_restore(struct tty_struct *tty, struct tty_ldisc *old)
* be obtained while the delayed work queue halt ensures that no more
* data is fed to the ldisc.
*
- * In order to wait for any existing references to complete see
- * tty_ldisc_wait_idle.
+ * You need to do a 'flush_scheduled_work()' (outside the ldisc_mutex)
+ * in order to make sure any currently executing ldisc work is also
+ * flushed.
*/
static int tty_ldisc_halt(struct tty_struct *tty)
@@ -753,11 +754,14 @@ void tty_ldisc_hangup(struct tty_struct *tty)
* N_TTY.
*/
if (tty->driver->flags & TTY_DRIVER_RESET_TERMIOS) {
+ /* Make sure the old ldisc is quiescent */
+ tty_ldisc_halt(tty);
+ flush_scheduled_work();
+
/* Avoid racing set_ldisc or tty_ldisc_release */
mutex_lock(&tty->ldisc_mutex);
if (tty->ldisc) { /* Not yet closed */
/* Switch back to N_TTY */
- tty_ldisc_halt(tty);
tty_ldisc_reinit(tty);
/* At this point we have a closed ldisc and we want to
reopen it. We could defer this to the next open but