linux-kernel - Re: b43 locks the machine when resuming after suspend to disk

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Message-ID: <20080710181038.GA13483@ucw.cz>
Date:	Thu, 10 Jul 2008 20:10:38 +0200
From:	Pavel Machek <pavel@...e.cz>
To:	Giacomo Mulas <gmulas@...astro.it>
Cc:	Johannes Berg <johannes@...solutions.net>,
	"Rafael J. Wysocki" <rjw@...k.pl>, linux-kernel@...r.kernel.org,
	debian-kernel@...ts.debian.org,
	Broadcom Linux <bcm43xx-dev@...ts.berlios.de>
Subject: Re: b43 locks the machine when resuming after suspend to disk

Hi!

> >This seems very odd though, Giacomo, are you sure it 
> >also happens if you
> >unload the module?
> 
> yes, absolutely (unfortunately). I can unload the module 
> before suspending,
> reload it after resuming, same result; I can actually do 
> any number of
> suspend/resumes, unload and reload the modules any 
> number of times,
> everything still works until I try to ifconfig up the 
> interface, then it
> hangs solid. 

That starts to sound like some core problem -- bug in b43 does not
explain symptoms you see. What other drivers does b43 share interrupt
with? Do those work after resume? Maybe irqpoll helps?

> I am now compining a kernel with the patch you sent, to 
> see whether this
> improves things. I will let you know. By the way, is 
> there a module
> debugging option I could use to cause the b43 and/or 
> mac80211 modules to use
> lots of printk's, so that I could at least give you a 
> hint as to where the
> code hangs?

Adding printks to b43's resume should be easy...

-- 
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(cesky, pictures) http://atrey.karlin.mff.cuni.cz/~pavel/picture/horses/blog.html
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