AuxXxilium/linux_dsm_epyc7002
1
0
Fork 0
mirror of https://github.com/AuxXxilium/linux_dsm_epyc7002.git synced 2024-12-24 22:07:45 +07:00
Code Issues Actions Packages Projects Releases Wiki Activity

Merge branch 'net-phy-fix-WoL-handling-when-suspending-the-PHY'

Browse Source 
Heiner Kallweit says:

====================
net: phy: fix WoL handling when suspending the PHY

phy_suspend doesn't always recognize that WoL is enabled and therefore
suspends the PHY when it should not. First idea to address the issue
was to reuse checks used in mdio_bus_phy_may_suspend which check
whether relevant devices are wakeup-enabled.
Florian raised some concerns because drivers may enable wakeup even if
WoL isn't enabled (e.g. certain USB network drivers).

The new approach focuses on reducing the risk to break existing stuff.
We add a flag wol_enabled to struct net_device which is set in
ethtool_set_wol(). Then this flag is checked in phy_suspend().
This doesn't cover 100% of the cases yet (e.g. if WoL is enabled w/o
explicit configuration), but it covers the most relevant cases with
very little risk of regressions.

v2:
- Fix a typo
====================

Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
David S. Miller 2018-09-26 20:04:11 -07:00
commit 30ed487192
3 changed files with 20 additions and 4 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

12
drivers/net/phy/phy_device.c
View File

@ -93,7 +93,12 @@ static bool mdio_bus_phy_may_suspend(struct phy_device *phydev)
if (!netdev)
return !phydev->suspended;
/* Don't suspend PHY if the attached netdev parent may wakeup.
if (netdev->wol_enabled)
return false;
/* As long as not all affected network drivers support the
* wol_enabled flag, let's check for hints that WoL is enabled.
* Don't suspend PHY if the attached netdev parent may wake up.
* The parent may point to a PCI device, as in tg3 driver.
*/
if (netdev->dev.parent && device_may_wakeup(netdev->dev.parent))
@ -1132,9 +1137,9 @@ void phy_detach(struct phy_device *phydev)
sysfs_remove_link(&dev->dev.kobj, "phydev");
sysfs_remove_link(&phydev->mdio.dev.kobj, "attached_dev");
}
phy_suspend(phydev);
phydev->attached_dev->phydev = NULL;
phydev->attached_dev = NULL;
phy_suspend(phydev);
phydev->phylink = NULL;
phy_led_triggers_unregister(phydev);
@ -1168,12 +1173,13 @@ EXPORT_SYMBOL(phy_detach);
int phy_suspend(struct phy_device *phydev)
{
struct phy_driver *phydrv = to_phy_driver(phydev->mdio.dev.driver);
struct net_device *netdev = phydev->attached_dev;
struct ethtool_wolinfo wol = { .cmd = ETHTOOL_GWOL };
int ret = 0;
/* If the device has WOL enabled, we cannot suspend the PHY */
phy_ethtool_get_wol(phydev, &wol);
if (wol.wolopts)
if (wol.wolopts || (netdev && netdev->wol_enabled))
return -EBUSY;
if (phydev->drv && phydrv->suspend)

3
include/linux/netdevice.h
View File

@ -1730,6 +1730,8 @@ enum netdev_priv_flags {
* switch driver and used to set the phys state of the
* switch port.
*
* @wol_enabled: Wake-on-LAN is enabled
*
* FIXME: cleanup struct net_device such that network protocol info
* moves out.
*/
@ -2014,6 +2016,7 @@ struct net_device {
struct lock_class_key *qdisc_tx_busylock;
struct lock_class_key *qdisc_running_key;
bool proto_down;
unsigned wol_enabled:1;
};
#define to_net_dev(d) container_of(d, struct net_device, dev)

9
net/core/ethtool.c
View File

@ -1483,6 +1483,7 @@ static int ethtool_get_wol(struct net_device *dev, char __user *useraddr)
static int ethtool_set_wol(struct net_device *dev, char __user *useraddr)
{
struct ethtool_wolinfo wol;
int ret;
if (!dev->ethtool_ops->set_wol)
return -EOPNOTSUPP;
@ -1490,7 +1491,13 @@ static int ethtool_set_wol(struct net_device *dev, char __user *useraddr)
if (copy_from_user(&wol, useraddr, sizeof(wol)))
return -EFAULT;
return dev->ethtool_ops->set_wol(dev, &wol);
ret = dev->ethtool_ops->set_wol(dev, &wol);
if (ret)
return ret;
dev->wol_enabled = !!wol.wolopts;
return 0;
}
static int ethtool_get_eee(struct net_device *dev, char __user *useraddr)