drm/amdgpu/userq: fix error handling of invalid doorbell

commit c767d74 upstream.

If the doorbell is invalid, be sure to set the r to an error
state so the function returns an error.

Reviewed-by: David (Ming Qiang) Wu <[email protected]>
Signed-off-by: Alex Deucher <[email protected]>
(cherry picked from commit 7e2a5b0a9a165a7c51274aa01b18be29491b4345)
Cc: [email protected]
Signed-off-by: Greg Kroah-Hartman <[email protected]>

Author: alexdeucher

drivers/gpu/drm/amd/amdgpu/amdgpu_userq.c

@@ -426,6 +426,7 @@ amdgpu_userq_create(struct drm_file *filp, union drm_amdgpu_userq *args)
 	if (index == (uint64_t)-EINVAL) {
 		drm_file_err(uq_mgr->file, "Failed to get doorbell for queue\n");
 		kfree(queue);
+		r = -EINVAL;
 		goto unlock;
 	}