flags can be used by driver to decide whether need to block wait submission.
Signed-off-by: NChunming Zhou <david1.zhou@amd.com>
SIgned-off-by: NChristian König <christian.koenig@amd.com>
Reviewed-by: NChristian König <christian.koenig@amd.com>
Link: https://patchwork.kernel.org/patch/10641339/