[linux-sunxi] [PATCH] net: sun4i-emac: Properly free resources on probe failure and remove

[Hans de Goede]

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 <hdego...@redhat.com>
---
 drivers/net/ethernet/allwinner/sun4i-emac.c | 20 ++++++++++++++++----
 1 file changed, 16 insertions(+), 4 deletions(-)

diff --git a/drivers/net/ethernet/allwinner/sun4i-emac.c 
b/drivers/net/ethernet/allwinner/sun4i-emac.c
index 48ce83e..8d50314 100644
--- a/drivers/net/ethernet/allwinner/sun4i-emac.c
+++ b/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 @@ out:
 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");
-- 
2.5.0

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