net: ethernet: mtk_eth_soc: fix error handling in mtk_open()

[ Upstream commit f70074140524c59a0935947b06dd6cb6e1ea642d ]

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@huawei.com>
Reviewed-by: Russell King (Oracle) <rmk+kernel@armlinux.org.uk>
Link: https://lore.kernel.org/r/20221117111356.161547-1-liujian56@huawei.com
Signed-off-by: Jakub Kicinski <kuba@kernel.org>
Signed-off-by: Sasha Levin <sashal@kernel.org>

diff --git a/drivers/net/ethernet/mediatek/mtk_eth_soc.c b/drivers/net/ethernet/mediatek/mtk_eth_soc.c
index 8601ef26c26045c205776e35ed0cfe4be981c062..cc6a5b2f24e3ec87bd1b745b889f6a98b0fabca7 100644 (file)
--- a/drivers/net/ethernet/mediatek/mtk_eth_soc.c
+++ b/drivers/net/ethernet/mediatek/mtk_eth_soc.c
@@ -2327,8 +2327,10 @@ static int mtk_open(struct net_device *dev)
                int err;
 
                err = mtk_start_dma(eth);
-               if (err)
+               if (err) {
+                       phylink_disconnect_phy(mac->phylink);
                        return err;
+               }
 
                if (eth->soc->offload_version && mtk_ppe_start(&eth->ppe) == 0)
                        gdm_config = MTK_GDMA_TO_PPE;