drm/msm/gem: Unpin buffers earlier

We've already attached the fences, so obj->resv (which shrinker checks)
tells us whether they are still active.  So we can unpin sooner, before
we drop the queue lock.

This also avoids the need to grab the obj lock in the retire path,
avoiding potential for lock contention between submit and retire.
Signed-off-by: Rob Clark <robdclark@chromium.org>
Patchwork: https://patchwork.freedesktop.org/patch/496132/
Link: https://lore.kernel.org/r/20220802155152.1727594-12-robdclark@gmail.com

drivers/gpu/drm/msm/msm_gem_submit.c

@@ -501,11 +501,11 @@ static int submit_reloc(struct msm_gem_submit *submit, struct msm_gem_object *ob
  */
 static void submit_cleanup(struct msm_gem_submit *submit, bool error)
 {
-	unsigned cleanup_flags = BO_LOCKED;
+	unsigned cleanup_flags = BO_LOCKED | BO_OBJ_PINNED;
 	unsigned i;
 
 	if (error)
-		cleanup_flags |= BO_VMA_PINNED | BO_OBJ_PINNED;
+		cleanup_flags |= BO_VMA_PINNED;
 
 	for (i = 0; i < submit->nr_bos; i++) {
 		struct msm_gem_object *msm_obj = submit->bos[i].obj;
@@ -522,10 +522,6 @@ void msm_submit_retire(struct msm_gem_submit *submit)
 	for (i = 0; i < submit->nr_bos; i++) {
 		struct drm_gem_object *obj = &submit->bos[i].obj->base;
 
-		msm_gem_lock(obj);
-		/* Note, VMA already fence-unpinned before submit: */
-		submit_cleanup_bo(submit, i, BO_OBJ_PINNED);
-		msm_gem_unlock(obj);
 		drm_gem_object_put(obj);
 	}
 }