linux-kernel - Re: [LOCKDEP] 33-rc8 Running aplay with pulse as the default

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Date:	Thu, 18 Feb 2010 14:21:12 +0100
From:	Takashi Iwai <tiwai@...e.de>
To:	Ed Tomlinson <edt@....ca>
Cc:	"Rafael J. Wysocki" <rjw@...k.pl>, linux-kernel@...r.kernel.org,
	alsa-devel@...a-project.org
Subject: Re: [LOCKDEP] 33-rc8 Running aplay with pulse as the default

At Thu, 18 Feb 2010 07:25:38 -0500,
Ed Tomlinson wrote:
> 
> On Wednesday 17 February 2010 09:29:37 Takashi Iwai wrote:
> > At Wed, 17 Feb 2010 08:16:32 -0500,
> > Ed Tomlinson wrote:
> > > 
> > > On Tuesday 16 February 2010 08:37:46 Takashi Iwai wrote:
> > > > > Thanks for the patch.  It helps in that it eliminates the opps but lockdep still triggers and aplay still fails.  
> > > > > Here is the new traceback.
> > > > 
> > > > Hmm, fixing this isn't so trivial.  The same problem occurs on other
> > > > subsystems like NFS over years.  And it's still there, AFAIK.
> > > > The mmap mutex appears suddenly in the strange code path at close.
> > > > 
> > > > The patch below might fix, but I'm not 100% sure whether this has no
> > > > side effect.
> > > > 
> > > > Anyway, I doubt very much it being a regression.  There is no change
> > > > in ALSA core side, and also in V4L em28xx code.  Maybe the lockdep
> > > > wasn't triggered by some reason.  And, this lockdep warning is almost
> > > > harmless...
> > > 
> > > Takashi,
> > > 
> > > The second patch eliminating the lock causes oppes every time (one follows just in case
> > > its helpful).
> > 
> > Are you sure?  The patch should causes a compile error, so you must have
> > patched manually in a wrong place ;)
> 
> Yes I am sure.  I fixed the compile error the same way it is fixed below.

But the Oops looks pretty irrelevant from the code path.


Takashi
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