linux-kernel - Re: APM lockups since 2.6.25

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Message-Id: <200804170214.26368.rjw@sisk.pl>
Date:	Thu, 17 Apr 2008 02:14:25 +0200
From:	"Rafael J. Wysocki" <rjw@...k.pl>
To:	Mikulas Patocka <mikulas@...ax.karlin.mff.cuni.cz>
Cc:	linux-kernel@...r.kernel.org
Subject: Re: APM lockups since 2.6.25

On Wednesday, 16 of April 2008, Mikulas Patocka wrote:
> > So it didn't help, I just got this (2.6.25-rc8):
> > 
> > (I have turned lockdep on few days ago, and it seems to try to release a 
> > lock that's not held ... and then reacquire that lock again and deadlock)
> 
> BTW. the first one message happened immediatelly after APM resume, the 
> second message 2 minutes later.
> 
> APMD didn't set time after resume, it's completely locked up.

Well, unfortunately, APM uses the generic code for suspending and resuming
devices, but it doesn't use the freezing of tasks, so it's not very reliable in
its present form.

Thanks,
Rafael
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