drm/qxl: Remove release_lock stupidity

The locking of release_lock was stupid; t should have been be called with
fence_lock_irq if it was legitimately used. Unfortunately it never protected
anything except the fence implementation correctly.

Signed-off-by: Maarten Lankhorst <maarten.lankhorst@canonical.com>

drivers/gpu/drm/qxl/qxl_debugfs.c

@@ -57,7 +57,6 @@ qxl_debugfs_buffers_info(struct seq_file *m, void *data)
 	struct qxl_device *qdev = node->minor->dev->dev_private;
 	struct qxl_bo *bo;
 
-	spin_lock(&qdev->release_lock);
 	list_for_each_entry(bo, &qdev->gem.objects, list) {
 		struct reservation_object_list *fobj;
 		int rel;
@@ -71,7 +70,6 @@ qxl_debugfs_buffers_info(struct seq_file *m, void *data)
 			   (unsigned long)bo->gem_base.size,
 			   bo->pin_count, rel);
 	}
-	spin_unlock(&qdev->release_lock);
 	return 0;
 }
 

drivers/gpu/drm/qxl/qxl_release.c

@@ -71,7 +71,7 @@ static long qxl_fence_wait(struct fence *fence, bool intr, signed long timeout)
 retry:
 	sc++;
 
-	if (fence_is_signaled_locked(fence))
+	if (fence_is_signaled(fence))
 		goto signaled;
 
 	qxl_io_notify_oom(qdev);
@@ -80,11 +80,11 @@ retry:
 		if (!qxl_queue_garbage_collect(qdev, true))
 			break;
 
-		if (fence_is_signaled_locked(fence))
+		if (fence_is_signaled(fence))
 			goto signaled;
 	}
 
-	if (fence_is_signaled_locked(fence))
+	if (fence_is_signaled(fence))
 		goto signaled;
 
 	if (have_drawable_releases || sc < 4) {
@@ -457,8 +457,6 @@ void qxl_release_fence_buffer_objects(struct qxl_release *release)
 	glob = bo->glob;
 
 	spin_lock(&glob->lru_lock);
-	/* acquire release_lock to protect bo->resv->fence and its contents */
-	spin_lock(&qdev->release_lock);
 
 	list_for_each_entry(entry, &release->bos, head) {
 		bo = entry->bo;
@@ -468,7 +466,6 @@ void qxl_release_fence_buffer_objects(struct qxl_release *release)
 		ttm_bo_add_to_lru(bo);
 		__ttm_bo_unreserve(bo);
 	}
-	spin_unlock(&qdev->release_lock);
 	spin_unlock(&glob->lru_lock);
 	ww_acquire_fini(&release->ticket);
 }