linux-kernel - [PATCH AUTOSEL 4.19 40/84] net: usb: lan78xx: Fix suspend/resume PHY register access error

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Message-Id: <20191227174352.6264-40-sashal@kernel.org>
Date:   Fri, 27 Dec 2019 12:43:08 -0500
From:   Sasha Levin <sashal@...nel.org>
To:     linux-kernel@...r.kernel.org, stable@...r.kernel.org
Cc:     Cristian Birsan <cristian.birsan@...rochip.com>,
        "David S . Miller" <davem@...emloft.net>,
        Sasha Levin <sashal@...nel.org>, netdev@...r.kernel.org,
        linux-usb@...r.kernel.org
Subject: [PATCH AUTOSEL 4.19 40/84] net: usb: lan78xx: Fix suspend/resume PHY register access error

From: Cristian Birsan <cristian.birsan@...rochip.com>

[ Upstream commit 20032b63586ac6c28c936dff696981159913a13f ]

Lan78xx driver accesses the PHY registers through MDIO bus over USB
connection. When performing a suspend/resume, the PHY registers can be
accessed before the USB connection is resumed. This will generate an
error and will prevent the device to resume correctly.
This patch adds the dependency between the MDIO bus and USB device to
allow correct handling of suspend/resume.

Fixes: ce85e13ad6ef ("lan78xx: Update to use phylib instead of mii_if_info.")
Signed-off-by: Cristian Birsan <cristian.birsan@...rochip.com>
Signed-off-by: David S. Miller <davem@...emloft.net>
Signed-off-by: Sasha Levin <sashal@...nel.org>
---
 drivers/net/usb/lan78xx.c | 1 +
 1 file changed, 1 insertion(+)

diff --git a/drivers/net/usb/lan78xx.c b/drivers/net/usb/lan78xx.c
index 50bf4b2080d5..6dd24a1ca10d 100644
--- a/drivers/net/usb/lan78xx.c
+++ b/drivers/net/usb/lan78xx.c
@@ -1823,6 +1823,7 @@ static int lan78xx_mdio_init(struct lan78xx_net *dev)
 	dev->mdiobus->read = lan78xx_mdiobus_read;
 	dev->mdiobus->write = lan78xx_mdiobus_write;
 	dev->mdiobus->name = "lan78xx-mdiobus";
+	dev->mdiobus->parent = &dev->udev->dev;
 
 	snprintf(dev->mdiobus->id, MII_BUS_ID_SIZE, "usb-%03d:%03d",
 		 dev->udev->bus->busnum, dev->udev->devnum);
-- 
2.20.1