linux-kernel - Re: [PATCH 1/2] sysdev: Do not register with sysdev when erroring on add

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Date:	Sun, 5 Jun 2011 14:15:56 +0200
From:	Borislav Petkov <bp@...64.org>
To:	Brian Gerst <brgerst@...il.com>
Cc:	"greg@...ah.com" <greg@...ah.com>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH 1/2] sysdev: Do not register with sysdev when erroring
 on add

On Sun, Jun 05, 2011 at 07:07:34AM -0400, Brian Gerst wrote:
> On Tue, Feb 1, 2011 at 11:19 AM, Borislav Petkov <bp@...64.org> wrote:
> > From: Borislav Petkov <borislav.petkov@....com>
> >
> > When encountering an error while executing the driver's ->add method, we
> > should cancel registration and unwind what we've regged so far. The low
> > level ->add methods do return proper error codes but those aren't looked
> > at in sysdev_driver_register(). Fix that by sharing the unregistering
> > code.
> 
> This patch is causing boot failures on a virtual machine running
> Fedora 15 32-bit.  With this patch, the microcode driver repeatedly
> spews:
> microcode: CPU0: AMD CPU family 0x6 not supported
> modprobe: FATAL: Error inserting microcode: Invalid argument.
> until eventually causing an oops.  Reverting this patch allows the
> boot to proceed.

Yeah, we had a similar issue with a K8 machine on Fedora:
https://bugzilla.kernel.org/show_bug.cgi?id=35522

Another fix would be if you remove the *microcode.rules in
/etc/udev/rules.d/ which tries to load the microcode driver
continuously. The funny thing is, this happens only on Fedora - all the
other distros simply get the -EINVAL from the driver failing to load
and that's it. I guess Fedora's udev doesn't accept the error value and
continues to try to load the module.

-- 
Regards/Gruss,
Boris.

Advanced Micro Devices GmbH
Einsteinring 24, 85609 Dornach
General Managers: Alberto Bozzo, Andrew Bowd
Registration: Dornach, Gemeinde Aschheim, Landkreis Muenchen
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