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Subject[-mm patch] pcm_native: lockdep warning when launching jack
On Mon, Apr 02, 2007 at 10:47:45PM -0700, Andrew Morton wrote:
>
> ftp://ftp.kernel.org/pub/linux/kernel/people/akpm/patches/2.6/2.6.21-rc5/2.6.21-rc5-mm4/
>
Hi,

When launching "jackd -d alsa", lockdep issues the following warning:
[39701.405086] =============================================
[39701.405093] [ INFO: possible recursive locking detected ]
[39701.405107] 2.6.21-rc5-mm4 #2
[39701.405109] ---------------------------------------------
[39701.405112] jackd/17366 is trying to acquire lock:
[39701.405114] (&substream->self_group.lock){....}, at: [<c034d3c0>] snd_pcm_action_group+0x90/0x240
[39701.405131]
[39701.405131] but task is already holding lock:
[39701.405134] (&substream->self_group.lock){....}, at: [<c034d63f>] snd_pcm_action_lock_irq+0x3f/0xb0
[39701.405141]
[39701.405142] other info that might help us debug this:
[39701.405145] 3 locks held by jackd/17366:
[39701.405147] #0: (snd_pcm_link_rwlock){....}, at: [<c034d627>] snd_pcm_action_lock_irq+0x27/0xb0
[39701.405155] #1: (&substream->group->lock){....}, at: [<c034d638>] snd_pcm_action_lock_irq+0x38/0xb0
[39701.405163] #2: (&substream->self_group.lock){....}, at: [<c034d63f>] snd_pcm_action_lock_irq+0x3f/0xb0
[39701.405171]
[39701.405171] stack backtrace:
[39701.405174] [<c0103b8a>] show_trace_log_lvl+0x1a/0x30
[39701.405179] [<c0104912>] show_trace+0x12/0x20
[39701.405183] [<c01049c6>] dump_stack+0x16/0x20
[39701.405187] [<c013b980>] __lock_acquire+0xbd0/0x1040
[39701.405193] [<c013be60>] lock_acquire+0x70/0x90
[39701.405197] [<c0407846>] _spin_lock+0x36/0x50
[39701.405203] [<c034d3c0>] snd_pcm_action_group+0x90/0x240
[39701.405207] [<c034d653>] snd_pcm_action_lock_irq+0x53/0xb0
[39701.405211] [<c035046f>] snd_pcm_common_ioctl1+0x35f/0xfb0
[39701.405215] [<c0351544>] snd_pcm_playback_ioctl1+0x34/0x420
[39701.405219] [<c03519f3>] snd_pcm_playback_ioctl+0x43/0x50
[39701.405223] [<c017ecc8>] do_ioctl+0x28/0x80
[39701.405229] [<c017ed77>] vfs_ioctl+0x57/0x290
[39701.405233] [<c017efe9>] sys_ioctl+0x39/0x60
[39701.405237] [<c0102bf4>] sysenter_past_esp+0x5d/0x99
[39701.405240] =======================
The attached lockdep annotation silences the warning.
Regards,
Frederik

Signed-off-by: Frederik Deweerdt <frederik.deweerdt@gmail.com>

--- 2.6.21-rc5-mm3/sound/core/pcm_native.c 2007-03-30 21:41:18.000000000 +0200
+++ 2.6.21-rc5-mm4/sound/core/pcm_native.c 2007-04-05 15:01:19.000000000 +0200
@@ -718,7 +718,8 @@ static int snd_pcm_action_group(struct a

snd_pcm_group_for_each_entry(s, substream) {
if (do_lock && s != substream)
- spin_lock(&s->self_group.lock);
+ spin_lock_nested(&s->self_group.lock,
+ SINGLE_DEPTH_NESTING);
res = ops->pre_action(s, state);
if (res < 0)
goto _unlock;
-
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