diff options
| author | Thomas Hellstrom <thellstrom@vmware.com> | 2010-11-02 13:21:47 +0000 |
|---|---|---|
| committer | Dave Airlie <airlied@redhat.com> | 2010-11-09 13:38:32 +1000 |
| commit | aa123268c2623c62e33248dafc0572f091689e86 (patch) | |
| tree | 8a61fcdcc61849b5b931466bc4560b543bc75527 /drivers/gpu/drm/ttm | |
| parent | a0ae5864d42b41c411368bd689462bf063c029c8 (diff) | |
| download | lwn-aa123268c2623c62e33248dafc0572f091689e86.tar.gz lwn-aa123268c2623c62e33248dafc0572f091689e86.zip | |
drm/ttm: Make sure a sync object doesn't disappear while we use it
The sync object may disappear as soon as we release the bo::lock, so
take a reference on it while we use it.
One option would be to call sync_object_flush() before releasing the bo::lock,
but that would put an atomic requirement on that function.
Signed-off-by: Thomas Hellstrom <thellstrom@vmware.com>
Signed-off-by: Dave Airlie <airlied@redhat.com>
Diffstat (limited to 'drivers/gpu/drm/ttm')
| -rw-r--r-- | drivers/gpu/drm/ttm/ttm_bo.c | 11 |
1 files changed, 7 insertions, 4 deletions
diff --git a/drivers/gpu/drm/ttm/ttm_bo.c b/drivers/gpu/drm/ttm/ttm_bo.c index a32fe41e5e24..340dfb11959d 100644 --- a/drivers/gpu/drm/ttm/ttm_bo.c +++ b/drivers/gpu/drm/ttm/ttm_bo.c @@ -458,7 +458,7 @@ static void ttm_bo_cleanup_refs_or_queue(struct ttm_buffer_object *bo) struct ttm_bo_device *bdev = bo->bdev; struct ttm_bo_global *glob = bo->glob; struct ttm_bo_driver *driver; - void *sync_obj; + void *sync_obj = NULL; void *sync_obj_arg; int put_count; int ret; @@ -493,17 +493,20 @@ static void ttm_bo_cleanup_refs_or_queue(struct ttm_buffer_object *bo) spin_lock(&glob->lru_lock); } queue: - sync_obj = bo->sync_obj; - sync_obj_arg = bo->sync_obj_arg; driver = bdev->driver; + if (bo->sync_obj) + sync_obj = driver->sync_obj_ref(bo->sync_obj); + sync_obj_arg = bo->sync_obj_arg; kref_get(&bo->list_kref); list_add_tail(&bo->ddestroy, &bdev->ddestroy); spin_unlock(&glob->lru_lock); spin_unlock(&bo->lock); - if (sync_obj) + if (sync_obj) { driver->sync_obj_flush(sync_obj, sync_obj_arg); + driver->sync_obj_unref(&sync_obj); + } schedule_delayed_work(&bdev->wq, ((HZ / 100) < 1) ? 1 : HZ / 100); } |