[PATCH net v2] net: phy: Fix the issue that netif always links up after resuming

From: Kunihiko Hayashi
Date: Tue Dec 18 2018 - 21:01:43 EST

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
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@xxxxxxxxx>
Signed-off-by: Kunihiko Hayashi <hayashi.kunihiko@xxxxxxxxxxxxx>
drivers/net/phy/phy_device.c | 7 ++-----
1 file changed, 2 insertions(+), 5 deletions(-)

This patch is based on the RFC patch discussion [1].
[1] https://www.spinics.net/lists/netdev/msg537326.html

Changes since v1:
- Add "Fixes:" line

diff --git a/drivers/net/phy/phy_device.c b/drivers/net/phy/phy_device.c
index 7d5d698..3685be4 100644
--- a/drivers/net/phy/phy_device.c
+++ b/drivers/net/phy/phy_device.c
@@ -315,11 +315,8 @@ 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;