diff --git a/drivers/mmc/core/queue.c b/drivers/mmc/core/queue.c
index 81b8d5ede484..9cee10e44e2f 100644
--- a/drivers/mmc/core/queue.c
+++ b/drivers/mmc/core/queue.c
@@ -370,8 +370,10 @@ static void mmc_setup_queue(struct mmc_queue *mq, struct mmc_card *card)
 		     "merging was advertised but not possible");
 	blk_queue_max_segments(mq->queue, mmc_get_max_segments(host));
 
-	if (mmc_card_mmc(card))
+	if (mmc_card_mmc(card) && card->ext_csd.data_sector_size) {
 		block_size = card->ext_csd.data_sector_size;
+		WARN_ON(block_size != 512 && block_size != 4096);
+	}
 
 	blk_queue_logical_block_size(mq->queue, block_size);
 	/*