We need to grab the resv lock first before doing that check.

v2 (chk): simplify the change for -fixes
Signed-off-by: NChristian König <christian.koenig@amd.com>
Signed-off-by: NThomas Hellström <thomas.hellstrom@linux.intel.com>
Reviewed-by: NHuang Rui <ray.huang@amd.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20210528130041.1683-1-christian.koenig@amd.com