netdev - [PATCH] net: ethernet: mediatek: fix warning in phy_start

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Message-Id: <20190108160526.18928-1-frank-w@public-files.de>
Date:   Tue,  8 Jan 2019 17:05:26 +0100
From:   Frank Wunderlich <frank-w@...lic-files.de>
To:     Felix Fietkau <nbd@...nwrt.org>, John Crispin <john@...ozen.org>,
        Sean Wang <sean.wang@...nel.org>,
        Nelson Chang <nelson.chang@...iatek.com>,
        "David S. Miller" <davem@...emloft.net>,
        Matthias Brugger <matthias.bgg@...il.com>,
        netdev@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
        linux-mediatek@...ts.infradead.org, linux-kernel@...r.kernel.org
Cc:     Frank Wunderlich <frank-w@...lic-files.de>
Subject: [PATCH] net: ethernet: mediatek: fix warning in phy_start_aneg

From: Sean Wang <sean.wang@...nel.org>

linux 5.0-rc1 shows following warning on bpi-r2/mt7623 bootup:

[ 5.170597] WARNING: CPU: 3 PID: 1 at drivers/net/phy/phy.c:548 phy_start_aneg+0x110/0x144
[ 5.178826] called from state READY
....
[ 5.264111] [<c0629fd4>] (phy_start_aneg) from [<c0e3e720>] (mtk_init+0x414/0x47c)
[ 5.271630] r7:df5f5eec r6:c0f08c48 r5:00000000 r4:dea67800
[ 5.277256] [<c0e3e30c>] (mtk_init) from [<c07dabbc>] (register_netdevice+0x98/0x51c)
[ 5.285035] r8:00000000 r7:00000000 r6:c0f97080 r5:c0f08c48 r4:dea67800
[ 5.291693] [<c07dab24>] (register_netdevice) from [<c07db06c>] (register_netdev+0x2c/0x44)
[ 5.299989] r8:00000000 r7:dea2e608 r6:deacea00 r5:dea2e604 r4:dea67800
[ 5.306646] [<c07db040>] (register_netdev) from [<c06326d8>] (mtk_probe+0x668/0x7ac)
[ 5.314336] r5:dea2e604 r4:dea2e040
[ 5.317890] [<c0632070>] (mtk_probe) from [<c05a78fc>] (platform_drv_probe+0x58/0xa8)
[ 5.325670] r10:c0f86bac r9:00000000 r8:c0fbe578 r7:00000000 r6:c0f86bac r5:00000000
[ 5.333445] r4:deacea10
[ 5.335963] [<c05a78a4>] (platform_drv_probe) from [<c05a5248>] (really_probe+0x2d8/0x424)

maybe other boards using this generic driver are affected

Signed-off-by: Frank Wunderlich <frank-w@...lic-files.de>
---
 drivers/net/ethernet/mediatek/mtk_eth_soc.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/net/ethernet/mediatek/mtk_eth_soc.c b/drivers/net/ethernet/mediatek/mtk_eth_soc.c
index 399f565dd85a..e48c06874a85 100644
--- a/drivers/net/ethernet/mediatek/mtk_eth_soc.c
+++ b/drivers/net/ethernet/mediatek/mtk_eth_soc.c
@@ -356,6 +356,7 @@ static int mtk_phy_connect(struct net_device *dev)
 	linkmode_copy(dev->phydev->advertising, dev->phydev->supported);
 	linkmode_set_bit(ETHTOOL_LINK_MODE_Autoneg_BIT,
 			 dev->phydev->advertising);
+	phy_start(dev->phydev);
 	phy_start_aneg(dev->phydev);
 
 	of_node_put(np);
@@ -1821,7 +1822,6 @@ static int mtk_open(struct net_device *dev)
 	else
 		refcount_inc(&eth->dma_refcnt);
 
-	phy_start(dev->phydev);
 	netif_start_queue(dev);
 
 	return 0;
-- 
2.17.1