linux-kernel - [14/39] drm/i915: fix non-Ironlake 965 class crashes

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Message-Id: <20100524231814.457330567@clark.site>
Date:	Mon, 24 May 2010 16:15:26 -0700
From:	Greg KH <gregkh@...e.de>
To:	linux-kernel@...r.kernel.org, stable@...nel.org
Cc:	stable-review@...nel.org, torvalds@...ux-foundation.org,
	akpm@...ux-foundation.org, alan@...rguk.ukuu.org.uk,
	Jesse Barnes <jbarnes@...tuousgeek.org>
Subject: [14/39] drm/i915: fix non-Ironlake 965 class crashes


2.6.33-stable review patch.  If anyone has any objections, please let us know.

------------------
From: Jesse Barnes <jbarnes@...tuousgeek.org>

commit 1918ad77f7f908ed67cf37c505c6ad4ac52f1ecf upstream.

My PIPE_CONTROL fix (just sent via Eric's tree) was buggy; I was
testing a whole set of patches together and missed a conversion to the
new HAS_PIPE_CONTROL macro, which will cause breakage on non-Ironlake
965 class chips.  Fortunately, the fix is trivial and has been tested.

Be sure to use the HAS_PIPE_CONTROL macro in i915_get_gem_seqno, or
we'll end up reading the wrong graphics memory, likely causing hangs,
crashes, or worse.

Reported-by: Zdenek Kabelac <zdenek.kabelac@...il.com>
Reported-by: Toralf Förster <toralf.foerster@....de>
Tested-by: Toralf Förster <toralf.foerster@....de>
Signed-off-by: Jesse Barnes <jbarnes@...tuousgeek.org>
Signed-off-by: Linus Torvalds <torvalds@...ux-foundation.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@...e.de>

---
 drivers/gpu/drm/i915/i915_gem.c |    2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

--- a/drivers/gpu/drm/i915/i915_gem.c
+++ b/drivers/gpu/drm/i915/i915_gem.c
@@ -1785,7 +1785,7 @@ i915_get_gem_seqno(struct drm_device *de
 {
 	drm_i915_private_t *dev_priv = dev->dev_private;
 
-	if (IS_I965G(dev))
+	if (HAS_PIPE_CONTROL(dev))
 		return ((volatile u32 *)(dev_priv->seqno_page))[0];
 	else
 		return READ_HWSP(dev_priv, I915_GEM_HWS_INDEX);


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