diff mbox series

[4.4,079/137] net: usb: lan78xx: Fix suspend/resume PHY register access error

Message ID 20200102220557.332025042@linuxfoundation.org
State New
Headers show
Series None | expand

Commit Message

Greg KH Jan. 2, 2020, 10:07 p.m. UTC 
From: Cristian Birsan <cristian.birsan@microchip.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@microchip.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
---
 drivers/net/usb/lan78xx.c |    1 +
 1 file changed, 1 insertion(+)
diff mbox series

Patch

--- a/drivers/net/usb/lan78xx.c
+++ b/drivers/net/usb/lan78xx.c
@@ -1448,6 +1448,7 @@  static int lan78xx_mdio_init(struct lan7
 	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);