linux-kernel - Re: [PATCH -mm 5/5] b43: Avoid unregistering device objects during suspend

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Date:	Fri, 25 Jan 2008 12:45:14 +0100
From:	"Rafael J. Wysocki" <rjw@...k.pl>
To:	Michael Buesch <mb@...sch.de>
Cc:	Pavel Machek <pavel@....cz>,
	Andrew Morton <akpm@...ux-foundation.org>,
	pm list <linux-pm@...ts.linux-foundation.org>,
	Alan Stern <stern@...land.harvard.edu>,
	Len Brown <lenb@...nel.org>,
	LKML <linux-kernel@...r.kernel.org>,
	bcm43xx-dev@...ts.berlios.de,
	Alessandro Rubini <rubini@...vis.unipv.it>,
	Richard Purdie <rpurdie@...ys.net>
Subject: Re: [PATCH -mm 5/5] b43: Avoid unregistering device objects during suspend

On Friday, 25 of January 2008, Michael Buesch wrote:
> On Friday 25 January 2008 08:47:46 Pavel Machek wrote:
> > On Fri 2008-01-25 01:37:33, Rafael J. Wysocki wrote:
> > > From: Rafael J. Wysocki <rjw@...k.pl>
> > > 
> > > Modify the b43 driver to avoid deadlocking suspend and resume,
> > > which happens as a result of attempting to unregister device objects
> > > locked by the PM core during suspend/resume cycles.  Also, make it
> > > use a suspend-safe method of unregistering device object in the
> > > resume error path.
> > > 
> > > Signed-off-by: Rafael J. Wysocki <rjw@...k.pl>
> > > Acked-by: Michael Buesch <mb@...sch.de>
> > 
> > Maybe we should have global suspend_in_progress (or maybe system_state
> > == suspending?) and automatically switch to schedule_removal() while
> > it is set?
> > 
> 
> That would be great, from my perspective :)

Let's see how many drivers are going to need that.  If there's more than a
couple, it will certainly make sense to have a global variable like this.

Thanks,
Rafael
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