diff options
| -rw-r--r-- | drivers/char/drm/drm_bufs.c | 14 |
1 files changed, 10 insertions, 4 deletions
diff --git a/drivers/char/drm/drm_bufs.c b/drivers/char/drm/drm_bufs.c index 07b774fa3f38..bde64b84166e 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. |