linux-kernel - [PATCH] net: bcmgenet: Fix a resource leak in an error handling path in the probe functin

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Date:   Sat, 12 Dec 2020 19:20:05 +0100
From:   Christophe JAILLET <christophe.jaillet@...adoo.fr>
To:     opendmb@...il.com, f.fainelli@...il.com, davem@...emloft.net,
        kuba@...nel.org
Cc:     bcm-kernel-feedback-list@...adcom.com, netdev@...r.kernel.org,
        linux-kernel@...r.kernel.org, kernel-janitors@...r.kernel.org,
        Christophe JAILLET <christophe.jaillet@...adoo.fr>
Subject: [PATCH] net: bcmgenet: Fix a resource leak in an error handling path in the probe functin

If the 'register_netdev()' call fails, we must undo a previous
'bcmgenet_mii_init()' call.

Fixes: 1c1008c793fa ("net: bcmgenet: add main driver file")
Signed-off-by: Christophe JAILLET <christophe.jaillet@...adoo.fr>
---
The missing 'bcmgenet_mii_exit()' call is added here, instead of in the
error handling path in order to avoid some goto spaghetti code.
---
 drivers/net/ethernet/broadcom/genet/bcmgenet.c | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/drivers/net/ethernet/broadcom/genet/bcmgenet.c b/drivers/net/ethernet/broadcom/genet/bcmgenet.c
index be85dad2e3bc..fcca023f22e5 100644
--- a/drivers/net/ethernet/broadcom/genet/bcmgenet.c
+++ b/drivers/net/ethernet/broadcom/genet/bcmgenet.c
@@ -4069,8 +4069,10 @@ static int bcmgenet_probe(struct platform_device *pdev)
 	clk_disable_unprepare(priv->clk);
 
 	err = register_netdev(dev);
-	if (err)
+	if (err) {
+		bcmgenet_mii_exit(dev);
 		goto err;
+	}
 
 	return err;
 
-- 
2.27.0