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net: usb: lan78xx: don't modify phy_device state concurrently 

[ Upstream commit 6b67d4d63edece1033972214704c04f36c5be89a ]

Currently phy_device state could be left in inconsistent state shown
by following alert message[1]. This is because phy_read_status could
be called concurrently from lan78xx_delayedwork, phy_state_machine and
__ethtool_get_link. Fix this by making sure that phy_device state is
updated atomically.

[1] lan78xx 1-1.1.1:1.0 eth0: No phy led trigger registered for speed(-1)

Signed-off-by: Ivan T. Ivanov <iivanov@suse.de>
Signed-off-by: David S. Miller <davem@davemloft.net>
Signed-off-by: Sasha Levin <sashal@kernel.org>
This commit is contained in:
Ivan T. Ivanov 2021-08-04 11:13:39 +03:00 committed by Sasha Levin
parent be70436799
commit f92dc3a89d
1 changed files with 13 additions and 5 deletions
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18
drivers/net/usb/lan78xx.c
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@ -1159,7 +1159,7 @@ static int lan78xx_link_reset(struct lan78xx_net *dev)
{
struct phy_device *phydev = dev->net->phydev;
struct ethtool_link_ksettings ecmd;
int ladv, radv, ret;
int ladv, radv, ret, link;
u32 buf;
/* clear LAN78xx interrupt status */
@ -1167,9 +1167,12 @@ static int lan78xx_link_reset(struct lan78xx_net *dev)
if (unlikely(ret < 0))
return -EIO;
mutex_lock(&phydev->lock);
phy_read_status(phydev);
link = phydev->link;
mutex_unlock(&phydev->lock);
if (!phydev->link && dev->link_on) {
if (!link && dev->link_on) {
dev->link_on = false;
/* reset MAC */
@ -1182,7 +1185,7 @@ static int lan78xx_link_reset(struct lan78xx_net *dev)
return -EIO;
del_timer(&dev->stat_monitor);
} else if (phydev->link && !dev->link_on) {
} else if (link && !dev->link_on) {
dev->link_on = true;
phy_ethtool_ksettings_get(phydev, &ecmd);
@ -1471,9 +1474,14 @@ static int lan78xx_set_eee(struct net_device *net, struct ethtool_eee *edata)
static u32 lan78xx_get_link(struct net_device *net)
{
phy_read_status(net->phydev);
u32 link;
return net->phydev->link;
mutex_lock(&net->phydev->lock);
phy_read_status(net->phydev);
link = net->phydev->link;
mutex_unlock(&net->phydev->lock);
return link;
}
static void lan78xx_get_drvinfo(struct net_device *net,