linux-kernel - [PATCH] [9/139] drm/radeon/kms: fix vram base calculation on rs780/rs880

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Date:	Tue,  1 Feb 2011 16:43:23 -0800 (PST)
From:	Andi Kleen <andi@...stfloor.org>
To:	alexdeucher@...il.com, airlied@...hat.com, gregkh@...e.de,
	ak@...ux.intel.com, linux-kernel@...r.kernel.org, stable@...nel.org
Subject: [PATCH] [9/139] drm/radeon/kms: fix vram base calculation on rs780/rs880

2.6.35-longterm review patch.  If anyone has any objections, please let me know.

------------------
From: Alex Deucher <alexdeucher@...il.com>

commit 8961d52d4cc52edf5672f8f2712c57162b736793 upstream.

Avoid overflowing a 32 bit value.

Signed-off-by: Alex Deucher <alexdeucher@...il.com>
Signed-off-by: Dave Airlie <airlied@...hat.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@...e.de>
Signed-off-by: Andi Kleen <ak@...ux.intel.com>

---
 drivers/gpu/drm/radeon/r600.c |    6 ++++--
 1 file changed, 4 insertions(+), 2 deletions(-)

Index: linux-2.6.35.y/drivers/gpu/drm/radeon/r600.c
===================================================================
--- linux-2.6.35.y.orig/drivers/gpu/drm/radeon/r600.c
+++ linux-2.6.35.y/drivers/gpu/drm/radeon/r600.c
@@ -1189,8 +1189,10 @@ void r600_vram_gtt_location(struct radeo
 				mc->vram_end, mc->real_vram_size >> 20);
 	} else {
 		u64 base = 0;
-		if (rdev->flags & RADEON_IS_IGP)
-			base = (RREG32(MC_VM_FB_LOCATION) & 0xFFFF) << 24;
+		if (rdev->flags & RADEON_IS_IGP) {
+			base = RREG32(MC_VM_FB_LOCATION) & 0xFFFF;
+			base <<= 24;
+		}
 		radeon_vram_location(rdev, &rdev->mc, base);
 		rdev->mc.gtt_base_align = 0;
 		radeon_gtt_location(rdev, mc);
--
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