net: phy: Warn about incorrect mdio_bus_phy_resume() state

Calling mdio_bus_phy_resume() with neither the PHY state machine set to
PHY_HALTED nor phydev->mac_managed_pm set to true is a good indication
that we can produce a race condition looking like this:

CPU0						CPU1
bcmgenet_resume
 -> phy_resume
   -> phy_init_hw
 -> phy_start
   -> phy_resume
                                                phy_start_aneg()
mdio_bus_phy_resume
 -> phy_resume
    -> phy_write(..., BMCR_RESET)
     -> usleep()                                  -> phy_read()

with the phy_resume() function triggering a PHY behavior that might have
to be worked around with (see c83fad30555a ("net: phy: broadcom: Fix
brcm_fet_config_init()") for instance) that ultimately leads to an error
reading from the PHY.

Fixes: 1b003f68755c ("net: phy: make PHY PM ops a no-op if MAC driver manages PHY PM")
Signed-off-by: Florian Fainelli <f.fainelli@gmail.com>
Link: https://lore.kernel.org/r/20220801233403.258871-1-f.fainelli@gmail.com
Signed-off-by: Jakub Kicinski <kuba@kernel.org>

diff --git a/drivers/net/phy/phy_device.c b/drivers/net/phy/phy_device.c
index a74b320f5b2777005a112df42dee322c7e7111d9..0c6efd79269071ec5844940aa0c9dbcf1e09b49f 100644 (file)
--- a/drivers/net/phy/phy_device.c
+++ b/drivers/net/phy/phy_device.c
@@ -316,6 +316,12 @@ static __maybe_unused int mdio_bus_phy_resume(struct device *dev)
 
        phydev->suspended_by_mdio_bus = 0;
 
+       /* If we managed to get here with the PHY state machine in a state other
+        * than PHY_HALTED this is an indication that something went wrong and
+        * we should most likely be using MAC managed PM and we are not.
+        */
+       WARN_ON(phydev->state != PHY_HALTED && !phydev->mac_managed_pm);
+
        ret = phy_init_hw(phydev);
        if (ret < 0)
                return ret;