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drm/syncobj: Use proper methods for accessing rcu protected pointers 

Use rcu_dereference_protected() and rcu_assign_pointer() for accessing
the rcu protected syncobj->fence pointer. This eliminates several sparse
warnings.

Cc: Dave Airlie <airlied@redhat.com>
Cc: Jason Ekstrand <jason@jlekstrand.net>
Cc: linaro-mm-sig@lists.linaro.org
Cc: linux-media@vger.kernel.org
Cc: Alex Deucher <alexander.deucher@amd.com>
Cc: Christian König <christian.koenig@amd.com>
Cc: Sumit Semwal <sumit.semwal@linaro.org>
Cc: Chris Wilson <chris@chris-wilson.co.uk>
Signed-off-by: Ville Syrjälä <ville.syrjala@linux.intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20171102200336.23347-4-ville.syrjala@linux.intel.com
Reviewed-by: Daniel Vetter <daniel.vetter@ffwll.ch>
Acked-by: Christian König <christian.koenig@amd.com>
This commit is contained in:
Ville Syrjälä 2017-11-02 22:03:35 +02:00
parent 5f72db5916
commit 563eaf5331
1 changed files with 7 additions and 4 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

11
drivers/gpu/drm/drm_syncobj.c
View File

@ -106,7 +106,8 @@ static int drm_syncobj_fence_get_or_add_callback(struct drm_syncobj *syncobj,
* callback when a fence has already been set.
*/
if (syncobj->fence) {
*fence = dma_fence_get(syncobj->fence);
*fence = dma_fence_get(rcu_dereference_protected(syncobj->fence,
lockdep_is_held(&syncobj->lock)));
ret = 1;
} else {
*fence = NULL;
@ -168,8 +169,9 @@ void drm_syncobj_replace_fence(struct drm_syncobj *syncobj,
spin_lock(&syncobj->lock);
old_fence = syncobj->fence;
syncobj->fence = fence;
old_fence = rcu_dereference_protected(syncobj->fence,
lockdep_is_held(&syncobj->lock));
rcu_assign_pointer(syncobj->fence, fence);
if (fence != old_fence) {
list_for_each_entry_safe(cur, tmp, &syncobj->cb_list, node) {
@ -613,7 +615,8 @@ static void syncobj_wait_syncobj_func(struct drm_syncobj *syncobj,
container_of(cb, struct syncobj_wait_entry, syncobj_cb);
/* This happens inside the syncobj lock */
wait->fence = dma_fence_get(syncobj->fence);
wait->fence = dma_fence_get(rcu_dereference_protected(syncobj->fence,
lockdep_is_held(&syncobj->lock)));
wake_up_process(wait->task);
}