From 8f1e2373563673adbb7e3079d7a6d37bbb9e2d55 Mon Sep 17 00:00:00 2001 From: Heiner Kallweit Date: Wed, 3 Nov 2021 22:08:28 +0100 Subject: [PATCH] net: phy: fix duplex out of sync problem while changing settings [ Upstream commit a4db9055fdb9cf607775c66d39796caf6439ec92 ] 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 Tested-by: Zhang Changzhong Signed-off-by: Heiner Kallweit Link: https://lore.kernel.org/r/7b8b9456-a93f-abbc-1dc5-a2c2542f932c@gmail.com Signed-off-by: Jakub Kicinski Signed-off-by: Sasha Levin --- drivers/net/phy/phy.c | 7 ++++++- 1 file changed, 6 insertions(+), 1 deletion(-) diff --git a/drivers/net/phy/phy.c b/drivers/net/phy/phy.c index a3bfb156c83d7..beb2b66da1324 100644 --- a/drivers/net/phy/phy.c +++ b/drivers/net/phy/phy.c @@ -815,7 +815,12 @@ int phy_ethtool_ksettings_set(struct phy_device *phydev, phydev->mdix_ctrl = cmd->base.eth_tp_mdix_ctrl; /* Restart the PHY */ - _phy_start_aneg(phydev); + if (phy_is_started(phydev)) { + phydev->state = PHY_UP; + phy_trigger_machine(phydev); + } else { + _phy_start_aneg(phydev); + } mutex_unlock(&phydev->lock); return 0; -- 2.30.2