linux-kernel - [PATCH] ixp4xx_eth: Fix an error handling path in ixp4xx_eth

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Date:   Wed, 21 Dec 2022 08:17:52 +0100
From:   Christophe JAILLET <christophe.jaillet@...adoo.fr>
To:     Krzysztof Halasa <khalasa@...p.pl>,
        "David S. Miller" <davem@...emloft.net>,
        Eric Dumazet <edumazet@...gle.com>,
        Jakub Kicinski <kuba@...nel.org>,
        Paolo Abeni <pabeni@...hat.com>,
        Krzysztof Hałasa <khc@...waw.pl>
Cc:     linux-kernel@...r.kernel.org, kernel-janitors@...r.kernel.org,
        Christophe JAILLET <christophe.jaillet@...adoo.fr>,
        netdev@...r.kernel.org
Subject: [PATCH] ixp4xx_eth: Fix an error handling path in ixp4xx_eth_probe()

If an error occurs after a successful ixp4xx_mdio_register() call, it
should be undone by a corresponding ixp4xx_mdio_remove().

Add the missing call in the error handling path, as already done in the
remove function.

Fixes: 2098c18d6cf6 ("IXP4xx: Add PHYLIB support to Ethernet driver.")
Signed-off-by: Christophe JAILLET <christophe.jaillet@...adoo.fr>
---
 drivers/net/ethernet/xscale/ixp4xx_eth.c | 8 ++++++--
 1 file changed, 6 insertions(+), 2 deletions(-)

diff --git a/drivers/net/ethernet/xscale/ixp4xx_eth.c b/drivers/net/ethernet/xscale/ixp4xx_eth.c
index 3b0c5f177447..007d68b385a5 100644
--- a/drivers/net/ethernet/xscale/ixp4xx_eth.c
+++ b/drivers/net/ethernet/xscale/ixp4xx_eth.c
@@ -1490,8 +1490,10 @@ static int ixp4xx_eth_probe(struct platform_device *pdev)
 
 	netif_napi_add_weight(ndev, &port->napi, eth_poll, NAPI_WEIGHT);
 
-	if (!(port->npe = npe_request(NPE_ID(port->id))))
-		return -EIO;
+	if (!(port->npe = npe_request(NPE_ID(port->id)))) {
+		err = -EIO;
+		goto err_remove_mdio;
+	}
 
 	port->plat = plat;
 	npe_port_tab[NPE_ID(port->id)] = port;
@@ -1530,6 +1532,8 @@ static int ixp4xx_eth_probe(struct platform_device *pdev)
 err_free_mem:
 	npe_port_tab[NPE_ID(port->id)] = NULL;
 	npe_release(port->npe);
+err_remove_mdio:
+	ixp4xx_mdio_remove();
 	return err;
 }
 
-- 
2.34.1