1 files changed, 4 insertions, 1 deletions

diff --git a/drivers/mmc/mmc_block.c b/drivers/mmc/mmc_block.c
index b5b4a7b11903..d4eee99c2bf6 100644
--- a/drivers/mmc/mmc_block.c
+++ b/drivers/mmc/mmc_block.c
@@ -383,7 +383,10 @@ static int mmc_blk_probe(struct mmc_card *card)
         struct mmc_blk_data *md;
         int err;
 
-        if (card->csd.cmdclass & ~0x1ff)
+        /*
+         * Check that the card supports the command class(es) we need.
+         */
+        if (!(card->csd.cmdclass & CCC_BLOCK_READ))
                 return -ENODEV;
 
         if (card->csd.read_blkbits < 9) {