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List:       linux-sound
Subject:    Re: snd_ac97_update_bits called with spinlock held
From:       Jaroslav Kysela <perex () suse ! cz>
Date:       2005-07-26 11:41:17
Message-ID: Pine.LNX.4.61.0507261339480.8190 () tm8103-a ! perex-int ! cz
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On Mon, 25 Jul 2005, Marcelo Tosatti wrote:

> Hi folks,
> 
> I'm using RH's 2.6.11-1.14_FC3 on my laptop and encountered this issue  
> after removing/adding snd modules.                                      
> 
> snd_ac97_update_bits tries to grab a semaphore while
> snd_pcm_action_single is holding a couple of spinlocks. It seems that 
> the erratic callpath is also possible with v2.6 mainline.
> 
> Debug: sleeping function called from invalid context at include/asm/semaphore.h:107
> in_atomic():0, irqs_disabled():1
>  [<c011cfbe>] __might_sleep+0x9c/0xa4
>  [<e09e02d3>] snd_ac97_update_bits+0x31/0x61 [snd_ac97_codec]
>  [<e094aa7b>] snd_intel8x0m_pcm_trigger+0x5b/0x74 [snd_intel8x0m]

This snd_ac97_update_bits() call was removed from the trigger callback in 
our recent code. This setup is available using a control element from user 
space now.

						Jaroslav

-----
Jaroslav Kysela <perex@suse.cz>
Linux Kernel Sound Maintainer
ALSA Project, SUSE Labs
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