netdev - [PATCH net] net: ethernet: mtk_eth_soc: fix error handling in mtk

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Message-ID: <20221117111356.161547-1-liujian56@huawei.com>
Date:   Thu, 17 Nov 2022 19:13:56 +0800
From:   Liu Jian <liujian56@...wei.com>
To:     <nbd@....name>, <john@...ozen.org>, <sean.wang@...iatek.com>,
        <Mark-MC.Lee@...iatek.com>, <davem@...emloft.net>,
        <edumazet@...gle.com>, <kuba@...nel.org>, <pabeni@...hat.com>,
        <matthias.bgg@...il.com>, <linux@...linux.org.uk>,
        <opensource@...rst.com>
CC:     <netdev@...r.kernel.org>, <linux-arm-kernel@...ts.infradead.org>,
        <linux-mediatek@...ts.infradead.org>,
        Liu Jian <liujian56@...wei.com>
Subject: [PATCH net] net: ethernet: mtk_eth_soc: fix error handling in mtk_open()

If mtk_start_dma() fails, invoke phylink_disconnect_phy() to perform
cleanup. phylink_disconnect_phy() contains the put_device action. If
phylink_disconnect_phy is not performed, the Kref of netdev will leak.

Fixes: b8fc9f30821e ("net: ethernet: mediatek: Add basic PHYLINK support")
Signed-off-by: Liu Jian <liujian56@...wei.com>
---
 Compile tested only.
 drivers/net/ethernet/mediatek/mtk_eth_soc.c | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/drivers/net/ethernet/mediatek/mtk_eth_soc.c b/drivers/net/ethernet/mediatek/mtk_eth_soc.c
index 7cd381530aa4..1d1f2342e3ec 100644
--- a/drivers/net/ethernet/mediatek/mtk_eth_soc.c
+++ b/drivers/net/ethernet/mediatek/mtk_eth_soc.c
@@ -2996,8 +2996,10 @@ static int mtk_open(struct net_device *dev)
 		int i;
 
 		err = mtk_start_dma(eth);
-		if (err)
+		if (err) {
+			phylink_disconnect_phy(mac->phylink);
 			return err;
+		}
 
 		for (i = 0; i < ARRAY_SIZE(eth->ppe); i++)
 			mtk_ppe_start(eth->ppe[i]);
-- 
2.17.1