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Date: Tue, 13 Jul 2004 02:25:01 -0700
From: Andrew Morton <akpm@osdl.org>
To: Takashi Iwai <tiwai@suse.de>
Cc: rlrevell@joe-job.com, linux-audio-dev@music.columbia.edu, mingo@elte.hu,
       arjanv@redhat.com, linux-kernel@vger.kernel.org
Subject: Re: [linux-audio-dev] Re: [announce] [patch] Voluntary Kernel
 Preemption Patch
Message-Id: <20040713022501.5e41b1a2.akpm@osdl.org>
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Takashi Iwai <tiwai@suse.de> wrote:
>
> t Tue, 13 Jul 2004 02:00:25 -0700,
>  Andrew Morton wrote:
>  > 
>  > Lee Revell <rlrevell@joe-job.com> wrote:
>  > >
>  > >  Here are some more.  These result from using mplayer with ALSA OSS
>  > >  emulation:
>  > > 
>  > >  Jul 13 04:31:49 mindpipe kernel:
>  > >  Jul 13 04:31:49 mindpipe kernel: ALSA /usr/src/alsa-cvs-1.0.5/alsa-driver/alsa-kernel/core/pcm_lib.c:169: XRUN: pcmC0D0p
>  > >  Jul 13 04:31:49 mindpipe kernel:  [__crc_totalram_pages+1387264/5353478] snd_pcm_period_elapsed+0x2ca/0x410 [snd_pcm]
>  > >  Jul 13 04:31:49 mindpipe kernel:  [__crc_totalram_pages+1455070/5353478] snd_emu10k1_interrupt+0x3c8/0x480 [snd_emu10k1]
>  > >  Jul 13 04:31:49 mindpipe kernel:  [handle_IRQ_event+49/96] handle_IRQ_event+0x31/0x60
>  > >  Jul 13 04:31:49 mindpipe kernel:  [do_IRQ+155/352] do_IRQ+0x9b/0x160
>  > >  Jul 13 04:31:49 mindpipe kernel:  [common_interrupt+24/32] common_interrupt+0x18/0x20
>  > >  Jul 13 04:31:49 mindpipe kernel:  [__crc_totalram_pages+1394929/5353478] snd_pcm_format_set_silence+0x4b/0x1d0 [snd_pcm]
>  > >  Jul 13 04:31:49 mindpipe kernel:  [__crc_totalram_pages+2165815/5353478] snd_pcm_oss_change_params+0x5a1/0x850 [snd_pcm_oss]
>  > >  Jul 13 04:31:49 mindpipe kernel:  [__crc_totalram_pages+2166620/5353478] snd_pcm_oss_get_active_substream+0x76/0x90 [snd_pcm_oss]
>  > >  Jul 13 04:31:49 mindpipe kernel:  [__crc_totalram_pages+2170556/5353478] snd_pcm_oss_get_formats+0x26/0x100 [snd_pcm_oss]
>  > 
>  > Looks like those memcpys in snd_pcm_format_set_silence() are hurting.
> 
>  Hmm, but it's not in lock at least...

It is - see chrdev_open().

You can do unlock_kernel()/lock_kernel() in soundcore_open().