drm/ttm: never consider pinned BOs for eviction&swap

There is a small window where we have already incremented the pin count
but not yet moved the bo from the lru to the pinned list.

Signed-off-by: Christian König <[email protected]>
Reported-by: Pelloux-Prayer, Pierre-Eric <[email protected]>
Tested-by: Pelloux-Prayer, Pierre-Eric <[email protected]>
Acked-by: Alex Deucher <[email protected]>
Cc: [email protected]
Link: https://patchwork.freedesktop.org/patch/msgid/[email protected]

Author: ChristianKoenigAMD

drivers/gpu/drm/ttm/ttm_bo.c

@@ -517,6 +517,12 @@ static bool ttm_bo_evict_swapout_allowable(struct ttm_buffer_object *bo,
 {
 	bool ret = false;
 
+	if (bo->pin_count) {
+		*locked = false;
+		*busy = false;
+		return false;
+	}
+
 	if (bo->base.resv == ctx->resv) {
 		dma_resv_assert_held(bo->base.resv);
 		if (ctx->allow_res_evict)