linux-kernel - Re: [Bug 10030] Suspend doesn't work when SD card is inserted

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Message-ID: <Pine.LNX.4.44L0.0802241535130.11316-100000@netrider.rowland.org>
Date:	Sun, 24 Feb 2008 15:45:21 -0500 (EST)
From:	Alan Stern <stern@...land.harvard.edu>
To:	"Rafael J. Wysocki" <rjw@...k.pl>
cc:	Pierre Ossman <drzeus-mmc@...eus.cx>,
	Zdenek Kabelac <zdenek.kabelac@...il.com>,
	Kernel development list <linux-kernel@...r.kernel.org>,
	pm list <linux-pm@...ts.linux-foundation.org>,
	Pavel Machek <pavel@....cz>
Subject: Re: [Bug 10030] Suspend doesn't work when SD card is inserted

On Sun, 24 Feb 2008, Rafael J. Wysocki wrote:

> From: Rafael J. Wysocki <rjw@...k.pl>
> 
> Remove the code that acquires all device semaphores from the suspend
> code path as it causes multiple problems to appear (most notably,
> http://bugzilla.kernel.org/show_bug.cgi?id=10030) and revert the
> change introduced by commit 4145ed6dc597a9bea5f6ae8c574653b2de10620f
> depending on the code being removed.
> 
> Remove pm_sleep_lock()/pm_sleep_unlock() from device add to avoid
> the issue reported at http://bugzilla.kernel.org/show_bug.cgi?id=9874.

Do you actually know whether removing that lock fixes the reported bug?

I agree, the lock should be removed for now.  But I'd sure like to get 
some feedback about what's going wrong.  It's starting to look as 
though we'd be a lot better off blocking device registration during 
sleep instead of failing it.

Shouldn't resume_device() and suspend_device() now acquire the device 
semaphore before calling the various methods?  That's the way they 
used to work.

Alan Stern

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