netdev - [PATCH] net: allwinner: Fix some resources leak in the error handling path of the probe and in the remove function

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Message-Id: <20201214202117.146293-1-christophe.jaillet@wanadoo.fr>
Date:   Mon, 14 Dec 2020 21:21:17 +0100
From:   Christophe JAILLET <christophe.jaillet@...adoo.fr>
To:     davem@...emloft.net, kuba@...nel.org, mripard@...nel.org,
        wens@...e.org, jernej.skrabec@...l.net, timur@...nel.org,
        song.bao.hua@...ilicon.com, f.fainelli@...il.com, leon@...nel.org,
        hkallweit1@...il.com, wangyunjian@...wei.com, sr@...x.de
Cc:     linux-arm-kernel@...ts.infradead.org, netdev@...r.kernel.org,
        linux-kernel@...r.kernel.org, kernel-janitors@...r.kernel.org,
        Christophe JAILLET <christophe.jaillet@...adoo.fr>
Subject: [PATCH] net: allwinner: Fix some resources leak in the error handling path of the probe and in the remove function

'irq_of_parse_and_map()' should be balanced by a corresponding
'irq_dispose_mapping()' call. Otherwise, there is some resources leaks.

Add such a call in the error handling path of the probe function and in the
remove function.

Fixes: 492205050d77 ("net: Add EMAC ethernet driver found on Allwinner A10 SoC's")
Signed-off-by: Christophe JAILLET <christophe.jaillet@...adoo.fr>
---
Please, carefully check the remove function, I'm not always confident by
the correct order when releasing resources. This is sometimes tricky.
---
 drivers/net/ethernet/allwinner/sun4i-emac.c | 7 +++++--
 1 file changed, 5 insertions(+), 2 deletions(-)

diff --git a/drivers/net/ethernet/allwinner/sun4i-emac.c b/drivers/net/ethernet/allwinner/sun4i-emac.c
index 862ea44beea7..5ed80d9a6b9f 100644
--- a/drivers/net/ethernet/allwinner/sun4i-emac.c
+++ b/drivers/net/ethernet/allwinner/sun4i-emac.c
@@ -828,13 +828,13 @@ static int emac_probe(struct platform_device *pdev)
 	db->clk = devm_clk_get(&pdev->dev, NULL);
 	if (IS_ERR(db->clk)) {
 		ret = PTR_ERR(db->clk);
-		goto out_iounmap;
+		goto out_dispose_mapping;
 	}
 
 	ret = clk_prepare_enable(db->clk);
 	if (ret) {
 		dev_err(&pdev->dev, "Error couldn't enable clock (%d)\n", ret);
-		goto out_iounmap;
+		goto out_dispose_mapping;
 	}
 
 	ret = sunxi_sram_claim(&pdev->dev);
@@ -893,6 +893,8 @@ static int emac_probe(struct platform_device *pdev)
 	sunxi_sram_release(&pdev->dev);
 out_clk_disable_unprepare:
 	clk_disable_unprepare(db->clk);
+out_dispose_mapping:
+	irq_dispose_mapping(ndev->irq);
 out_iounmap:
 	iounmap(db->membase);
 out:
@@ -911,6 +913,7 @@ static int emac_remove(struct platform_device *pdev)
 	unregister_netdev(ndev);
 	sunxi_sram_release(&pdev->dev);
 	clk_disable_unprepare(db->clk);
+	irq_dispose_mapping(ndev->irq);
 	iounmap(db->membase);
 	free_netdev(ndev);
 
-- 
2.27.0