linux-kernel - Re: [PATCH] drm/radeon: Fix kernel panic on shutdown

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Message-ID: <20161031215201.jbppfpufehdqjcjw@pd.tnic>
Date:   Mon, 31 Oct 2016 22:52:01 +0100
From:   Borislav Petkov <bp@...en8.de>
To:     "Deucher, Alexander" <Alexander.Deucher@....com>
Cc:     'Larry Finger' <Larry.Finger@...inger.net>,
        Linus Torvalds <torvalds@...ux-foundation.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        "driver-devel@...r.kernel.org" <driver-devel@...r.kernel.org>
Subject: Re: [PATCH] drm/radeon: Fix kernel panic on shutdown

On Mon, Oct 31, 2016 at 04:21:55PM +0000, Deucher, Alexander wrote:
> > -----Original Message-----
> > From: Larry Finger [mailto:larry.finger@...il.com] On Behalf Of Larry Finger
> > Sent: Monday, October 31, 2016 12:41 AM
> > To: Linus Torvalds
> > Cc: linux-kernel@...r.kernel.org; driver-devel@...r.kernel.org; Larry
> > Finger; Deucher, Alexander
> > Subject: [PATCH] drm/radeon: Fix kernel panic on shutdown
> > 
> > Since commit a481daa88fd4 ("drm/radeon: always apply pci shutdown
> > callbacks"), a Dell Latitude D600 laptop has crashed on shutdown. The
> > PCI Identification of the graphics adapter is "VGA compatible controller
> > [0300]: Advanced Micro Devices, Inc. [AMD/ATI] RV250/M9 GL [Mobility
> > FireGL 9000/Radeon 9000] [1002:4c66] (rev 01)".
> > 
> > Prior to commit b0c80bd5d2e3 ("drm/radeon: fix up dp aux tear down (v2)"),
> > I have no idea where the panic happened as the screen was blanked before
> > the crash.  Since that more recent change, the panic has been in routine
> > radeon_connector_unregister(), and has been shown to be due to a NULL
> > value in the ddc_bus member of struct drm_connector.
> > 
> > Fixes: a481daa88fd4 ("drm/radeon: always apply pci shutdown callbacks")
> > Signed-off-by: Larry Finger <Larry.Finger@...inger.net>
> > Cc: Alex Deucher <alexander.deucher@....com>
> 
> Applied.  Thanks!

Reported-and-tested-by: Borislav Petkov <bp@...e.de>

-- 
Regards/Gruss,
    Boris.

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