diff --git a/drivers/mmc/dw_mmc.c b/drivers/mmc/dw_mmc.c
index a0a582b..afc674d 100644
--- a/drivers/mmc/dw_mmc.c
+++ b/drivers/mmc/dw_mmc.c
@@ -119,6 +119,7 @@
 		}
 
 		if (host->fifo_mode && size) {
+			len = 0;
 			if (data->flags == MMC_DATA_READ) {
 				if ((dwmci_readl(host, DWMCI_RINTSTS) &
 				     DWMCI_INTMSK_RXDR)) {