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authorEric Anholt <eric@anholt.net>2007-08-13 16:29:24 -0700
committerEric Anholt <eric@anholt.net>2007-08-13 16:32:32 -0700
commit3ee211f4f7435792752c1dbcd3a60e2e7abfba09 (patch)
tree187bc7c2cabcbece34b5b72696e6b041625c1fca /linux-core
parent4340f49bf79a5421886363e08501ad347973b083 (diff)
Bug #11895: Only add the AGP base to map offset if the caller didn't.
The i830 and newer intel 2D code adds the AGP base to map offsets already, because it wasn't doing the AGP enable which used to set dev->agp->base. Credit goes to Zhenyu for finding the issue.
Diffstat (limited to 'linux-core')
-rw-r--r--linux-core/drm_bufs.c14
1 files changed, 10 insertions, 4 deletions
diff --git a/linux-core/drm_bufs.c b/linux-core/drm_bufs.c
index f9987ca6..f0b28fa1 100644
--- a/linux-core/drm_bufs.c
+++ b/linux-core/drm_bufs.c
@@ -223,11 +223,17 @@ static int drm_addmap_core(struct drm_device *dev, unsigned int offset,
#ifdef __alpha__
map->offset += dev->hose->mem_space->start;
#endif
- /* Note: dev->agp->base may actually be 0 when the DRM
- * is not in control of AGP space. But if user space is
- * it should already have added the AGP base itself.
+ /* In some cases (i810 driver), user space may have already
+ * added the AGP base itself, because dev->agp->base previously
+ * only got set during AGP enable. So, only add the base
+ * address if the map's offset isn't already within the
+ * aperture.
*/
- map->offset += dev->agp->base;
+ if (map->offset < dev->agp->base ||
+ map->offset > dev->agp->base +
+ dev->agp->agp_info.aper_size * 1024 * 1024) {
+ map->offset += dev->agp->base;
+ }
map->mtrr = dev->agp->agp_mtrr; /* for getmap */
/* This assumes the DRM is in total control of AGP space.