net: phy: Fix the issue that netif always links up after resuming

BugLink: https://bugs.launchpad.net/bugs/1837257
[ Upstream commit 8742beb50f2db903d3b6d69ddd81d67ce9914453 ]

Even though the link is down before entering hibernation,
there is an issue that the network interface always links up after resuming
from hibernation.

If the link is still down before enabling the network interface,
and after resuming from hibernation, the phydev->state is forcibly set
to PHY_UP in mdio_bus_phy_restore(), and the link becomes up.

In suspend sequence, only if the PHY is attached, mdio_bus_phy_suspend()
calls phy_stop_machine(), and mdio_bus_phy_resume() calls
phy_start_machine().
In resume sequence, it's enough to do the same as mdio_bus_phy_resume()
because the state has been preserved.

This patch fixes the issue by calling phy_start_machine() in
mdio_bus_phy_restore() in the same way as mdio_bus_phy_resume().

Fixes: bc87922ff59d ("phy: Move PHY PM operations into phy_device")
Suggested-by: Heiner Kallweit <hkallweit1@gmail.com>
Signed-off-by: Kunihiko Hayashi <hayashi.kunihiko@socionext.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Signed-off-by: Andrea Righi <andrea.righi@canonical.com>
Signed-off-by: Khalid Elmously <khalid.elmously@canonical.com>

diff --git a/drivers/net/phy/phy_device.c b/drivers/net/phy/phy_device.c
index c01feabd5215caf4838c8beeaf1f316aee51a716..9186fba35d148d4b037ab31c983ad1d8984095f3 100644 (file)
--- a/drivers/net/phy/phy_device.c
+++ b/drivers/net/phy/phy_device.c
@@ -159,11 +159,8 @@ static int mdio_bus_phy_restore(struct device *dev)
        if (ret < 0)
                return ret;
 
-       /* The PHY needs to renegotiate. */
-       phydev->link = 0;
-       phydev->state = PHY_UP;
-
-       phy_start_machine(phydev);
+       if (phydev->attached_dev && phydev->adjust_link)
+               phy_start_machine(phydev);
 
        return 0;
 }