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Message-Id: <20240628060318.458925-1-youwan@nfschina.com>
Date: Fri, 28 Jun 2024 14:03:18 +0800
From: Youwan Wang <youwan@...china.com>
To: andrew@...n.ch
Cc: hkallweit1@...il.com,
linux@...linux.org.uk,
davem@...emloft.net,
edumazet@...gle.com,
kuba@...nel.org,
pabeni@...hat.com,
netdev@...r.kernel.org,
linux-kernel@...r.kernel.org,
Youwan Wang <youwan@...china.com>
Subject: [PATCH] net: phy: phy_device: fix PHY WOL enabled, PM failed to suspend
If the PHY of the mido bus is enabled with Wake-on-LAN (WOL),
we cannot suspend the PHY. Although the WOL status has been
checked in phy_suspend(), returning -EBUSY(-16) would cause
the Power Management (PM) to fail to suspend. Since
phy_suspend() is an exported symbol (EXPORT_SYMBOL),
timely error reporting is needed. Therefore, an additional
check is performed here. If the PHY of the mido bus is enabled
with WOL, we skip calling phy_suspend() to avoid PM failure.
log:
[ 322.631362] OOM killer disabled.
[ 322.631364] Freezing remaining freezable tasks
[ 322.632536] Freezing remaining freezable tasks completed (elapsed 0.001 seconds)
[ 322.632540] printk: Suspending console(s) (use no_console_suspend to debug)
[ 322.633052] YT8521 Gigabit Ethernet stmmac-0:01:
PM: dpm_run_callback(): mdio_bus_phy_suspend+0x0/0x110 [libphy] returns -16
[ 322.633071] YT8521 Gigabit Ethernet stmmac-0:01:
PM: failed to suspend: error -16
[ 322.669699] PM: Some devices failed to suspend, or early wake event detected
[ 322.669949] OOM killer enabled.
[ 322.669951] Restarting tasks ... done.
[ 322.671008] random: crng reseeded on system resumption
[ 322.671014] PM: suspend exit
If the YT8521 driver adds phydrv->flags, ask the YT8521 driver to process
WOL at suspend and resume time, the phydev->suspended_by_mdio_bus=1
flag would cause the resume failure.
log:
[ 260.814763] YT8521 Gigabit Ethernet stmmac-0:01:
PM: dpm_run_callback():mdio_bus_phy_resume+0x0/0x160 [libphy] returns -95
[ 260.814782] YT8521 Gigabit Ethernet stmmac-0:01:
PM: failed to resume: error -95
Signed-off-by: Youwan Wang <youwan@...china.com>
---
drivers/net/phy/phy_device.c | 9 +++++++++
1 file changed, 9 insertions(+)
diff --git a/drivers/net/phy/phy_device.c b/drivers/net/phy/phy_device.c
index 2ce74593d6e4..c766130e2c41 100644
--- a/drivers/net/phy/phy_device.c
+++ b/drivers/net/phy/phy_device.c
@@ -270,6 +270,7 @@ static DEFINE_MUTEX(phy_fixup_lock);
static bool mdio_bus_phy_may_suspend(struct phy_device *phydev)
{
+ struct ethtool_wolinfo wol = { .cmd = ETHTOOL_GWOL };
struct device_driver *drv = phydev->mdio.dev.driver;
struct phy_driver *phydrv = to_phy_driver(drv);
struct net_device *netdev = phydev->attached_dev;
@@ -277,6 +278,14 @@ static bool mdio_bus_phy_may_suspend(struct phy_device *phydev)
if (!drv || !phydrv->suspend)
return false;
+ /* If the PHY of the mido bus is enabled with Wake-on-LAN (WOL),
+ * we cannot suspend the PHY.
+ */
+ phy_ethtool_get_wol(phydev, &wol);
+ phydev->wol_enabled = !!(wol.wolopts);
+ if (phydev->wol_enabled && !(phydrv->flags & PHY_ALWAYS_CALL_SUSPEND))
+ return false;
+
/* PHY not attached? May suspend if the PHY has not already been
* suspended as part of a prior call to phy_disconnect() ->
* phy_detach() -> phy_suspend() because the parent netdev might be the
--
2.25.1
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