diff options
Diffstat (limited to 'linux-core')
| -rw-r--r-- | linux-core/drm_bufs.c | 26 |
1 files changed, 17 insertions, 9 deletions
diff --git a/linux-core/drm_bufs.c b/linux-core/drm_bufs.c index 94fdaff1..6c1ec4c8 100644 --- a/linux-core/drm_bufs.c +++ b/linux-core/drm_bufs.c @@ -59,6 +59,7 @@ int DRM(order)( unsigned long size ) return order; } +static int permanent_maps = 0; /** * Adjusts the memory offset to its absolute value according to the mapping * type. Adds the map to the map list drm_device::maplist. Adds MTRR's where @@ -117,6 +118,7 @@ int DRM(initmap)( drm_device_t *dev, unsigned int offset, unsigned int size, int list_add(&list->head, &dev->maplist->head); up(&dev->struct_sem); + permanent_maps = 1; DRM_DEBUG("finished\n"); return 0; @@ -178,16 +180,22 @@ int DRM(addmap)( struct inode *inode, struct file *filp, /* after all the drivers switch to permanent mapping this should just return an error */ struct list_head *_list; - /* if map already exists, return the existing one instead of creating a new one */ - list_for_each( _list, &dev->maplist->head ) { - drm_map_list_t *_entry = list_entry( _list, drm_map_list_t, head ); - if ( _entry->map && _entry->map->type == map->type ) { - DRM(free)( map, sizeof(*map), DRM_MEM_MAPS ); - map = _entry->map; - DRM_DEBUG( "Found existing: offset = 0x%08lx, size = 0x%08lx, type = %d\n", - map->offset, map->size, map->type ); - goto found_it; + /* If permanent maps are implemented, maps must match */ + if (permanent_maps) { + list_for_each( _list, &dev->maplist->head ) { + drm_map_list_t *_entry = list_entry( _list, drm_map_list_t, head ); + if ( _entry->map && _entry->map->type == map->type && + _entry->map->offset == map->offset && + _entry->map->size == map->size ) { + DRM(free)( map, sizeof(*map), DRM_MEM_MAPS ); + map = _entry->map; + DRM_DEBUG( "Found existing: offset = 0x%08lx, size = 0x%08lx, type = %d\n", + map->offset, map->size, map->type ); + goto found_it; + } } + /* addmap didn't match an existing permanent map, that's an error */ + return -EINVAL; } #if !defined(__sparc__) && !defined(__alpha__) && !defined(__ia64__) if ( map->offset + map->size < map->offset || |