linux-kernel - [PATCH] net: phy: Don't WARN for PHY_READY state in mdio_bus_phy

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Message-Id: <20220818072943.1201926-1-xiaolei.wang@windriver.com>
Date:   Thu, 18 Aug 2022 15:29:43 +0800
From:   Xiaolei Wang <xiaolei.wang@...driver.com>
To:     andrew@...n.ch, hkallweit1@...il.com
Cc:     linux@...linux.org.uk, davem@...emloft.net, edumazet@...gle.com,
        kuba@...nel.org, pabeni@...hat.com, netdev@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: [PATCH] net: phy: Don't WARN for PHY_READY state in mdio_bus_phy_resume()

For some MAC drivers, they set the mac_managed_pm to true in its
->ndo_open() callback. So before the mac_managed_pm is set to true,
we still want to leverage the mdio_bus_phy_suspend()/resume() for
the phy device suspend and resume. In this case, the phy device is
in PHY_READY, and we shouldn't warn about this. It also seems that
the check of mac_managed_pm in WARN_ON is redundant since we already
check this in the entry of mdio_bus_phy_resume(), so drop it.

Fixes: fba863b81604 ("net: phy: Warn about incorrect mdio_bus_phy_resume() state")
Signed-off-by: Xiaolei Wang <xiaolei.wang@...driver.com>
---
 drivers/net/phy/phy_device.c | 8 ++++----
 1 file changed, 4 insertions(+), 4 deletions(-)

diff --git a/drivers/net/phy/phy_device.c b/drivers/net/phy/phy_device.c
index 0c6efd792690..12ff276b80ae 100644
--- a/drivers/net/phy/phy_device.c
+++ b/drivers/net/phy/phy_device.c
@@ -316,11 +316,11 @@ static __maybe_unused int mdio_bus_phy_resume(struct device *dev)
 
 	phydev->suspended_by_mdio_bus = 0;
 
-	/* If we managed to get here with the PHY state machine in a state other
-	 * than PHY_HALTED this is an indication that something went wrong and
-	 * we should most likely be using MAC managed PM and we are not.
+	/* If we manged to get here with the PHY state machine in a state neither
+	 * PHY_HALTED nor PHY_READY this is an indication that something went wrong
+	 * and we should most likely be using MAC managed PM and we are not.
 	 */
-	WARN_ON(phydev->state != PHY_HALTED && !phydev->mac_managed_pm);
+	WARN_ON(phydev->state != PHY_HALTED && phydev->state != PHY_READY);
 
 	ret = phy_init_hw(phydev);
 	if (ret < 0)
-- 
2.25.1