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-rw-r--r--drivers/char/drm/drm_bufs.c14
1 files changed, 10 insertions, 4 deletions
diff --git a/drivers/char/drm/drm_bufs.c b/drivers/char/drm/drm_bufs.c
index 07b774f..bde64b8 100644
--- a/drivers/char/drm/drm_bufs.c
+++ b/drivers/char/drm/drm_bufs.c
@@ -229,11 +229,17 @@ 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 - 1) {
+ map->offset += dev->agp->base;
+ }
map->mtrr = dev->agp->agp_mtrr; /* for getmap */
/* This assumes the DRM is in total control of AGP space.
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