1 files changed, 1 insertions, 1 deletions

diff --git a/drivers/mmc/card/block.c b/drivers/mmc/card/block.c
index ebc8b9d77613..97156b689e82 100644
--- a/drivers/mmc/card/block.c
+++ b/drivers/mmc/card/block.c
@@ -83,7 +83,7 @@ static void mmc_blk_put(struct mmc_blk_data *md)
         mutex_lock(&open_lock);
         md->usage--;
         if (md->usage == 0) {
-                int devidx = md->disk->first_minor >> MMC_SHIFT;
+                int devidx = MINOR(disk_devt(md->disk)) >> MMC_SHIFT;
                 __clear_bit(devidx, dev_use);
 
                 put_disk(md->disk);