net: phy: Fix not to call phy_resume() if PHY is not attached

[ Upstream commit ef1b5bf506b1f0ee3edc98533e1f3ecb105eb46a ]

This patch fixes an issue that mdio_bus_phy_resume() doesn't call
phy_resume() if the PHY is not attached.

Fixes: 803dd9c77ac3 ("net: phy: avoid suspending twice a PHY")
Signed-off-by: Yoshihiro Shimoda <yoshihiro.shimoda.uh@renesas.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
Signed-off-by: Sasha Levin <sashal@kernel.org>

diff --git a/drivers/net/phy/phy_device.c b/drivers/net/phy/phy_device.c
index 43c4f35..9c7e514 100644 (file)
--- a/drivers/net/phy/phy_device.c
+++ b/drivers/net/phy/phy_device.c
@@ -76,7 +76,7 @@ static LIST_HEAD(phy_fixup_list);
 static DEFINE_MUTEX(phy_fixup_lock);
 
 #ifdef CONFIG_PM
-static bool mdio_bus_phy_may_suspend(struct phy_device *phydev)
+static bool mdio_bus_phy_may_suspend(struct phy_device *phydev, bool suspend)
 {
        struct device_driver *drv = phydev->mdio.dev.driver;
        struct phy_driver *phydrv = to_phy_driver(drv);
@@ -88,10 +88,11 @@ static bool mdio_bus_phy_may_suspend(struct phy_device *phydev)
        /* 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
-        * MDIO bus driver and clock gated at this point.
+        * MDIO bus driver and clock gated at this point. Also may resume if
+        * PHY is not attached.
         */
        if (!netdev)
-               return !phydev->suspended;
+               return suspend ? !phydev->suspended : phydev->suspended;
 
        if (netdev->wol_enabled)
                return false;
@@ -126,7 +127,7 @@ static int mdio_bus_phy_suspend(struct device *dev)
        if (phydev->attached_dev && phydev->adjust_link)
                phy_stop_machine(phydev);
 
-       if (!mdio_bus_phy_may_suspend(phydev))
+       if (!mdio_bus_phy_may_suspend(phydev, true))
                return 0;
 
        return phy_suspend(phydev);
@@ -137,7 +138,7 @@ static int mdio_bus_phy_resume(struct device *dev)
        struct phy_device *phydev = to_phy_device(dev);
        int ret;
 
-       if (!mdio_bus_phy_may_suspend(phydev))
+       if (!mdio_bus_phy_may_suspend(phydev, false))
                goto no_resume;
 
        ret = phy_resume(phydev);