From: Akash Goel Date: Mon, 13 Jan 2014 10:54:45 +0000 (+0530) Subject: drm/i915: Fix the offset issue for the stolen GEM objects X-Git-Tag: submit/tizen_common/20140905.094502~775 X-Git-Url: http://review.tizen.org/git/?a=commitdiff_plain;h=4e2adfbb6e2a1a153ab461dfec1348d02ac68234;p=sdk%2Femulator%2Femulator-kernel.git drm/i915: Fix the offset issue for the stolen GEM objects commit ec14ba47791965d2c08e0a681ff44eacbf3c4553 upstream. The 'offset' field of the 'scatterlist' structure was wrongly programmed with the offset value from the base of stolen area, whereas this field indicates the offset from where the interested data starts within the first PAGE pointed to by 'scattterlist' structure. As a result when a new GEM object allocated from stolen area is mapped to GTT, it could lead to an overwrite of GTT entries as the page count calculation will go wrong, refer the function 'sg_page_count'. v2: Modified the commit message. (Chris) Signed-off-by: Akash Goel Reviewed-by: Jesse Barnes Bugzilla: https://bugs.freedesktop.org/show_bug.cgi?id=71908 Bugzilla: https://bugs.freedesktop.org/show_bug.cgi?id=69104 Signed-off-by: Daniel Vetter Signed-off-by: Greg Kroah-Hartman --- diff --git a/drivers/gpu/drm/i915/i915_gem_stolen.c b/drivers/gpu/drm/i915/i915_gem_stolen.c index e15a1d9..fe4a7d1 100644 --- a/drivers/gpu/drm/i915/i915_gem_stolen.c +++ b/drivers/gpu/drm/i915/i915_gem_stolen.c @@ -250,7 +250,7 @@ i915_pages_create_for_stolen(struct drm_device *dev, } sg = st->sgl; - sg->offset = offset; + sg->offset = 0; sg->length = size; sg_dma_address(sg) = (dma_addr_t)dev_priv->mm.stolen_base + offset;