linux-kernel - Re: [3.2+] BUG: scheduling while atomic: swapper/0/0/0x10000100

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Message-ID: <20120126164512.GD8665@legolas.emea.dhcp.ti.com>
Date:	Thu, 26 Jan 2012 18:45:13 +0200
From:	Felipe Balbi <balbi@...com>
To:	Yves-Alexis Perez <corsac@...ian.org>
Cc:	balbi@...com, Greg KH <greg@...ah.com>,
	linux-kernel@...r.kernel.org,
	Kuninori Morimoto <kuninori.morimoto.gx@...esas.com>,
	linux-usb@...r.kernel.org
Subject: Re: [3.2+] BUG: scheduling while atomic: swapper/0/0/0x10000100

On Thu, Jan 26, 2012 at 05:36:07PM +0100, Yves-Alexis Perez wrote:
> On jeu., 2012-01-26 at 18:31 +0200, Felipe Balbi wrote:
> > > Very odd, it wouldn't seem that this patch would cause such a problem,
> > > as it is "obviously" correct.
> > 
> > The funny thing is that I don't think there's any x86 system out there
> > with this *DRD* controller :-) 
> 
> Out of curiosity, what is a DRD controler?

Dual-Role Device. This Renesas controller can act as Host or as
Peripheral controller.

> > Specially when you consider the fact that
> > it's very recently that we dropped the ARCH dependency with commit
> > d242c110c43b55aaf3ebb3ceac1eeab0d452a177
> > 
> > > Kuninori, any thoughts about this?  Should I revert this from the
> > > tree?
> > 
> > I don't think so, I think this was a bad bisection.
> > 
> Maybe (especially since the first bad commit is a merge commit, so I'm
> not completely sure I did correctly the second bisect). But I'm puzzled
> why reverting the commit on top of 3.2.1 fixes that. And now that Felipe
> mentions it, USB Gadget is not even compiled, so I'm completely lost.

Hehehe :-) That's fun... Maybe it's some other instability and it just
didn't kick when you reverted that commit. It could be that the problem
is somewhere completely different and you just didn't fully debug it yet
:-)

-- 
balbi

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