diff --git a/drivers/mmc/card/block.c b/drivers/mmc/card/block.c
index c20995323348c3c30999e49819a1cfe6d132dc49..9e30cf6db53ca9b0e095aa745d22b3558cc10207 100644
--- a/drivers/mmc/card/block.c
+++ b/drivers/mmc/card/block.c
@@ -504,6 +504,7 @@ static int mmc_blk_issue_rw_rq(struct mmc_queue *mq, struct request *req)
 		struct mmc_command cmd;
 		u32 readcmd, writecmd, status = 0;
 
+		memset(&cmd, 0, sizeof(struct mmc_command));
 		memset(&brq, 0, sizeof(struct mmc_blk_request));
 		brq.mrq.cmd = &brq.cmd;
 		brq.mrq.data = &brq.data;