net: sun4i-emac: Properly free resources on probe failure and remove

Fix sun4i-emac not releasing the following resources:
-iomapped memory not released on probe-failure nor on remove
-clock not getting disabled on probe-failure nor on remove
-sram not being released on remove

And while at it also add error checking to the clk_prepare_enable call
done on probe.
Signed-off-by: Hans de Goede <hdegoede@redhat.com>
Acked-by: Maxime Ripard <maxime.ripard@free-electrons.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

drivers/net/ethernet/allwinner/sun4i-emac.c

@@ -847,21 +847,25 @@ static int emac_probe(struct platform_device *pdev)
 	if (ndev->irq == -ENXIO) {
 		netdev_err(ndev, "No irq resource\n");
 		ret = ndev->irq;
-		goto out;
+		goto out_iounmap;
 	}
 
 	db->clk = devm_clk_get(&pdev->dev, NULL);
 	if (IS_ERR(db->clk)) {
 		ret = PTR_ERR(db->clk);
-		goto out;
+		goto out_iounmap;
 	}
 
-	clk_prepare_enable(db->clk);
+	ret = clk_prepare_enable(db->clk);
+	if (ret) {
+		dev_err(&pdev->dev, "Error couldn't enable clock (%d)\n", ret);
+		goto out_iounmap;
+	}
 
 	ret = sunxi_sram_claim(&pdev->dev);
 	if (ret) {
 		dev_err(&pdev->dev, "Error couldn't map SRAM to device\n");
-		goto out;
+		goto out_clk_disable_unprepare;
 	}
 
 	db->phy_node = of_parse_phandle(np, "phy", 0);
@@ -910,6 +914,10 @@ static int emac_probe(struct platform_device *pdev)
 
 out_release_sram:
 	sunxi_sram_release(&pdev->dev);
+out_clk_disable_unprepare:
+	clk_disable_unprepare(db->clk);
+out_iounmap:
+	iounmap(db->membase);
 out:
 	dev_err(db->dev, "not found (%d).\n", ret);
 
@@ -921,8 +929,12 @@ static int emac_probe(struct platform_device *pdev)
 static int emac_remove(struct platform_device *pdev)
 {
 	struct net_device *ndev = platform_get_drvdata(pdev);
+	struct emac_board_info *db = netdev_priv(ndev);
 
 	unregister_netdev(ndev);
+	sunxi_sram_release(&pdev->dev);
+	clk_disable_unprepare(db->clk);
+	iounmap(db->membase);
 	free_netdev(ndev);
 
 	dev_dbg(&pdev->dev, "released and freed device\n");