diff --git a/drivers/net/ethernet/wiznet/w5100.c b/drivers/net/ethernet/wiznet/w5100.c
index 0f56b1c0e08203ea4fdc6dd29b54480bdd87a41b..70a930ac4fa9a0d113de07f3b6d52775312defc3 100644
--- a/drivers/net/ethernet/wiznet/w5100.c
+++ b/drivers/net/ethernet/wiznet/w5100.c
@@ -638,14 +638,12 @@ static int w5100_hw_probe(struct platform_device *pdev)
 	}
 
 	mem = platform_get_resource(pdev, IORESOURCE_MEM, 0);
-	if (!mem)
-		return -ENXIO;
-	mem_size = resource_size(mem);
-
 	priv->base = devm_ioremap_resource(&pdev->dev, mem);
 	if (IS_ERR(priv->base))
 		return PTR_ERR(priv->base);
 
+	mem_size = resource_size(mem);
+
 	spin_lock_init(&priv->reg_lock);
 	priv->indirect = mem_size < W5100_BUS_DIRECT_SIZE;
 	if (priv->indirect) {
diff --git a/drivers/net/ethernet/wiznet/w5300.c b/drivers/net/ethernet/wiznet/w5300.c
index f961f14a047343e7b06a3ea6601656e7ce2c139b..7974b7d90fccd0525f3b1830995ba0accb8ed8a6 100644
--- a/drivers/net/ethernet/wiznet/w5300.c
+++ b/drivers/net/ethernet/wiznet/w5300.c
@@ -558,14 +558,12 @@ static int w5300_hw_probe(struct platform_device *pdev)
 	}
 
 	mem = platform_get_resource(pdev, IORESOURCE_MEM, 0);
-	if (!mem)
-		return -ENXIO;
-	mem_size = resource_size(mem);
-
 	priv->base = devm_ioremap_resource(&pdev->dev, mem);
 	if (IS_ERR(priv->base))
 		return PTR_ERR(priv->base);
 
+	mem_size = resource_size(mem);
+
 	spin_lock_init(&priv->reg_lock);
 	priv->indirect = mem_size < W5300_BUS_DIRECT_SIZE;
 	if (priv->indirect) {