linux-kernel - Re: [PATCH] drm/i915: Treat crtc->mode.clock == 0 as disabled

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Message-ID: <20130107164035.GT5737@phenom.ffwll.local>
Date:	Mon, 7 Jan 2013 17:40:35 +0100
From:	Daniel Vetter <daniel@...ll.ch>
To:	Chris Wilson <chris@...is-wilson.co.uk>
Cc:	intel-gfx@...ts.freedesktop.org,
	Alexey Zaytsev <alexey.zaytsev@...il.com>,
	linux-kernel@...r.kernel.org,
	Linus Torvalds <torvalds@...ux-foundation.org>,
	Daniel Vetter <daniel.vetter@...ll.ch>,
	Jesse Barnes <jbarnes@...tuousgeek.org>, stable@...r.kernel.org
Subject: Re: [PATCH] drm/i915: Treat crtc->mode.clock == 0 as disabled

On Mon, Jan 07, 2013 at 10:11:40AM +0000, Chris Wilson wrote:
> Prevent a divide-by-zero by consistently treating an 'active' CRTC
> without a mode set as actually disabled.
> 
> This looks to have been first introduced with
> 
> commit 24929352481f085c5f85d4d4cbc919ddf106d381
> Author: Daniel Vetter <daniel.vetter@...ll.ch>
> Date:   Mon Jul 2 20:28:59 2012 +0200
> 
>     drm/i915: read out the modeset hw state at load and resume time
> 
> but then combined with
> 
> commit b0a2658acb5bf9ca86b4aab011b7106de3af0add
> Author: Daniel Vetter <daniel.vetter@...ll.ch>
> Date:   Tue Dec 18 09:37:54 2012 +0100
> 
>     drm/i915: don't disable disconnected outputs
> 
> it finally started oopsing.
> 
> Signed-off-by: Chris Wilson <chris@...is-wilson.co.uk>
> Reported-and-tested-by: Alexey Zaytsev <alexey.zaytsev@...il.com>
> Tested-by: Sedat Dilek <sedat.dilek@...il.com>
> Cc: Daniel Vetter <daniel.vetter@...ll.ch>
> Cc: Jesse Barnes <jbarnes@...tuousgeek.org>
> Cc: stable@...r.kernel.org

Picked up for -fixes, thanks for the patch.
-Daniel
-- 
Daniel Vetter
Software Engineer, Intel Corporation
+41 (0) 79 365 57 48 - http://blog.ffwll.ch
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