diff --git a/drivers/net/s2io.c b/drivers/net/s2io.c
index c50f4bf34202..1bf23e41f580 100644
--- a/drivers/net/s2io.c
+++ b/drivers/net/s2io.c
@@ -2904,7 +2904,7 @@ static void s2io_mdio_write(u32 mmd_type, u64 addr, u16 value, struct net_device
 {
 	u64 val64 = 0x0;
 	nic_t *sp = dev->priv;
-	XENA_dev_config_t *bar0 = (XENA_dev_config_t *)sp->bar0;
+	XENA_dev_config_t __iomem *bar0 = sp->bar0;
 
 	//address transaction
 	val64 = val64 | MDIO_MMD_INDX_ADDR(addr)
@@ -2953,7 +2953,7 @@ static u64 s2io_mdio_read(u32 mmd_type, u64 addr, struct net_device *dev)
 	u64 val64 = 0x0;
 	u64 rval64 = 0x0;
 	nic_t *sp = dev->priv;
-	XENA_dev_config_t *bar0 = (XENA_dev_config_t *)sp->bar0;
+	XENA_dev_config_t __iomem *bar0 = sp->bar0;
 
 	/* address transaction */
 	val64 = val64 | MDIO_MMD_INDX_ADDR(addr)
@@ -3276,7 +3276,7 @@ static void alarm_intr_handler(struct s2io_nic *nic)
  *   SUCCESS on success and FAILURE on failure.
  */
 
-static int wait_for_cmd_complete(void *addr, u64 busy_bit)
+static int wait_for_cmd_complete(void __iomem *addr, u64 busy_bit)
 {
 	int ret = FAILURE, cnt = 0;
 	u64 val64;