net: phy: fix duplex out of sync problem while changing settings
authorHeiner Kallweit <hkallweit1@gmail.com>
Wed, 3 Nov 2021 21:08:28 +0000 (22:08 +0100)
committerJakub Kicinski <kuba@kernel.org>
Thu, 4 Nov 2021 23:46:29 +0000 (16:46 -0700)
commita4db9055fdb9cf607775c66d39796caf6439ec92
treec7624300d8f723dec2ffc1010cf44459b8b989b4
parent96d0c9be432dfd4908e96dde7cab860368a348ab
net: phy: fix duplex out of sync problem while changing settings

As reported by Zhang there's a small issue if in forced mode the duplex
mode changes with the link staying up [0]. In this case the MAC isn't
notified about the change.

The proposed patch relies on the phylib state machine and ignores the
fact that there are drivers that uses phylib but not the phylib state
machine. So let's don't change the behavior for such drivers and fix
it w/o re-adding state PHY_FORCING for the case that phylib state
machine is used.

[0] https://lore.kernel.org/netdev/a5c26ffd-4ee4-a5e6-4103-873208ce0dc5@huawei.com/T/

Fixes: 2bd229df5e2e ("net: phy: remove state PHY_FORCING")
Reported-by: Zhang Changzhong <zhangchangzhong@huawei.com>
Tested-by: Zhang Changzhong <zhangchangzhong@huawei.com>
Signed-off-by: Heiner Kallweit <hkallweit1@gmail.com>
Link: https://lore.kernel.org/r/7b8b9456-a93f-abbc-1dc5-a2c2542f932c@gmail.com
Signed-off-by: Jakub Kicinski <kuba@kernel.org>
drivers/net/phy/phy.c