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net: usb: asix: replace mii_nway_restart in resume path

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[ Upstream commit 5c968f4802 ]

mii_nway_restart is not pm aware which results in a rtnl deadlock.
Implement mii_nway_restart manual by setting BMCR_ANRESTART if
BMCR_ANENABLE is set.

To reproduce:
* plug an asix based usb network interface
* wait until the device enters PM (~5 sec)
* `ip link set eth1 up` will never return

Fixes: d9fe64e511 ("net: asix: Add in_pm parameter")
Signed-off-by: Alexander Couzens <lynxis@fe80.eu>
Signed-off-by: David S. Miller <davem@davemloft.net>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Alexander Couzens 2018-07-17 13:17:09 +02:00 committed by Greg Kroah-Hartman
parent bbf9b1a464
commit 78cdeb665f
1 changed files with 3 additions and 1 deletions
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4
drivers/net/usb/asix_devices.c
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@ -642,10 +642,12 @@ static void ax88772_restore_phy(struct usbnet *dev)
priv->presvd_phy_advertise);
/* Restore BMCR */
if (priv->presvd_phy_bmcr & BMCR_ANENABLE)
priv->presvd_phy_bmcr |= BMCR_ANRESTART;
asix_mdio_write_nopm(dev->net, dev->mii.phy_id, MII_BMCR,
priv->presvd_phy_bmcr);
mii_nway_restart(&dev->mii);
priv->presvd_phy_advertise = 0;
priv->presvd_phy_bmcr = 0;
}