net: mvneta: use devm_ioremap_resource() instead of of_iomap()

The mvneta driver currently uses of_iomap(), which has two drawbacks:
it doesn't request the resource, and it isn't devm-style so some error
handling is needed.

This commit switches to use devm_ioremap_resource() instead, which
automatically requests the resource (so the I/O registers region shows
up properly in /proc/iomem), and also is devm-style, which allows to
get rid of some error handling to unmap the I/O registers region.

Signed-off-by: Thomas Petazzoni <thomas.petazzoni@free-electrons.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

drivers/net/ethernet/marvell/mvneta.c

@@ -22,6 +22,7 @@
 #include <linux/interrupt.h>
 #include <net/ip.h>
 #include <net/ipv6.h>
+#include <linux/io.h>
 #include <linux/of.h>
 #include <linux/of_irq.h>
 #include <linux/of_mdio.h>
@@ -2749,6 +2750,7 @@ static void mvneta_port_power_up(struct mvneta_port *pp, int phy_mode)
 static int mvneta_probe(struct platform_device *pdev)
 {
 	const struct mbus_dram_target_info *dram_target_info;
+	struct resource *res;
 	struct device_node *dn = pdev->dev.of_node;
 	struct device_node *phy_node;
 	u32 phy_addr;
@@ -2813,9 +2815,15 @@ static int mvneta_probe(struct platform_device *pdev)
 
 	clk_prepare_enable(pp->clk);
 
-	pp->base = of_iomap(dn, 0);
+	res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
+	if (!res) {
+		err = -ENODEV;
+		goto err_clk;
+	}
+
+	pp->base = devm_ioremap_resource(&pdev->dev, res);
 	if (pp->base == NULL) {
-		err = -ENOMEM;
+		err = PTR_ERR(pp->base);
 		goto err_clk;
 	}
 
@@ -2823,7 +2831,7 @@ static int mvneta_probe(struct platform_device *pdev)
 	pp->stats = alloc_percpu(struct mvneta_pcpu_stats);
 	if (!pp->stats) {
 		err = -ENOMEM;
-		goto err_unmap;
+		goto err_clk;
 	}
 
 	for_each_possible_cpu(cpu) {
@@ -2888,8 +2896,6 @@ err_deinit:
 	mvneta_deinit(pp);
 err_free_stats:
 	free_percpu(pp->stats);
-err_unmap:
-	iounmap(pp->base);
 err_clk:
 	clk_disable_unprepare(pp->clk);
 err_free_irq:
@@ -2909,7 +2915,6 @@ static int mvneta_remove(struct platform_device *pdev)
 	mvneta_deinit(pp);
 	clk_disable_unprepare(pp->clk);
 	free_percpu(pp->stats);
-	iounmap(pp->base);
 	irq_dispose_mapping(dev->irq);
 	free_netdev(dev);