This is a note to let you know that I've just added the patch titled
ALSA: timer: Use mod_timer() for rearming the system timer
to the 4.4-stable tree which can be found at:
http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary
The filename of the patch is:
alsa-timer-use-mod_timer-for-rearming-the-system-timer.patch
and it can be found in the queue-4.4 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.
>From 4a07083ed613644c96c34a7dd2853dc5d7c70902 Mon Sep 17 00:00:00 2001
From: Takashi Iwai <tiwai@xxxxxxx>
Date: Fri, 1 Apr 2016 12:28:16 +0200
Subject: ALSA: timer: Use mod_timer() for rearming the system timer
From: Takashi Iwai <tiwai@xxxxxxx>
commit 4a07083ed613644c96c34a7dd2853dc5d7c70902 upstream.
ALSA system timer backend stops the timer via del_timer() without sync
and leaves del_timer_sync() at the close instead. This is because of
the restriction by the design of ALSA timer: namely, the stop callback
may be called from the timer handler, and calling the sync shall lead
to a hangup. However, this also triggers a kernel BUG() when the
timer is rearmed immediately after stopping without sync:
kernel BUG at kernel/time/timer.c:966!
Call Trace:
<IRQ>
[<ffffffff8239c94e>] snd_timer_s_start+0x13e/0x1a0
[<ffffffff8239e1f4>] snd_timer_interrupt+0x504/0xec0
[<ffffffff8122fca0>] ? debug_check_no_locks_freed+0x290/0x290
[<ffffffff8239ec64>] snd_timer_s_function+0xb4/0x120
[<ffffffff81296b72>] call_timer_fn+0x162/0x520
[<ffffffff81296add>] ? call_timer_fn+0xcd/0x520
[<ffffffff8239ebb0>] ? snd_timer_interrupt+0xec0/0xec0
....
It's the place where add_timer() checks the pending timer. It's clear
that this may happen after the immediate restart without sync in our
cases.
So, the workaround here is just to use mod_timer() instead of
add_timer(). This looks like a band-aid fix, but it's a right move,
as snd_timer_interrupt() takes care of the continuous rearm of timer.
Reported-by: Jiri Slaby <jslaby@xxxxxxx>
Signed-off-by: Takashi Iwai <tiwai@xxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
---
sound/core/timer.c | 4 ++--
1 file changed, 2 insertions(+), 2 deletions(-)
--- a/sound/core/timer.c
+++ b/sound/core/timer.c
@@ -1051,8 +1051,8 @@ static int snd_timer_s_start(struct snd_
njiff += timer->sticks - priv->correction;
priv->correction = 0;
}
- priv->last_expires = priv->tlist.expires = njiff;
- add_timer(&priv->tlist);
+ priv->last_expires = njiff;
+ mod_timer(&priv->tlist, njiff);
return 0;
}
Patches currently in stable-queue which might be from tiwai@xxxxxxx are
queue-4.4/alsa-hda-asus-n750jv-external-subwoofer-fixup.patch
queue-4.4/alsa-hda-fix-white-noise-on-asus-n750jv-headphone.patch
queue-4.4/alsa-timer-use-mod_timer-for-rearming-the-system-timer.patch
queue-4.4/alsa-hda-apply-fix-for-white-noise-on-asus-n550jv-too.patch
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