linux-kernel - Re: broken suspend [Was: 2.6.24-rc2-mm1]

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Message-ID: <Pine.LNX.4.44L0.0711161058170.2738-100000@iolanthe.rowland.org>
Date:	Fri, 16 Nov 2007 11:10:27 -0500 (EST)
From:	Alan Stern <stern@...land.harvard.edu>
To:	Greg KH <greg@...ah.com>
cc:	Jiri Slaby <jirislaby@...il.com>,
	"Rafael J. Wysocki" <rjw@...k.pl>,
	Andrew Morton <akpm@...ux-foundation.org>,
	<linux-kernel@...r.kernel.org>,
	Linux-pm mailing list <linux-pm@...ts.linux-foundation.org>
Subject: Re: broken suspend [Was: 2.6.24-rc2-mm1]

On Thu, 15 Nov 2007, Greg KH wrote:

> > The offending -mm patch is
> > gregkh-driver-pm-acquire-device-locks-prior-to-suspending.patch
> > 
> > 2.6.24-rc2-mm1 minus it works just fine; PROVE_LOCKING shows nothing new when
> > the patch is applied.
> 
> Thanks for tracking this down.  Alan, any thoughts?

It's a driver problem somewhere.  Probably not one of the most common 
drivers because I don't see the same problem here (but then I'm not 
testing -mm).

The thing to do is figure out which driver is causing the problem.
Jiri, try enabling CONFIG_DEBUG_DRIVER.  If there's also a config 
option to prevent the console from being suspended, set it as well.  
Then you should be able to tell which driver is making trouble.

Alan Stern

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