netdev - [PATCH RFC net-next 1/7] net: phy: always call phy_process_state

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Message-Id: <E1qeZXZ-007G4D-7w@rmk-PC.armlinux.org.uk>
Date: Fri, 08 Sep 2023 12:20:45 +0100
From: "Russell King (Oracle)" <rmk+kernel@...linux.org.uk>
To: Andrew Lunn <andrew@...n.ch>,
	Heiner Kallweit <hkallweit1@...il.com>
Cc: Jijie Shao <shaojijie@...wei.com>,
	 shaojijie@...wei.com,
	 shenjian15@...wei.com,
	 liuyonglong@...wei.com,
	 wangjie125@...wei.com,
	 chenhao418@...wei.com,
	 lanhao@...wei.com,
	 wangpeiyang1@...wei.com,
	"David S. Miller" <davem@...emloft.net>,
	Eric Dumazet <edumazet@...gle.com>,
	Jakub Kicinski <kuba@...nel.org>,
	Paolo Abeni <pabeni@...hat.com>,
	netdev@...r.kernel.org
Subject: [PATCH RFC net-next 1/7] net: phy: always call
 phy_process_state_change() under lock

phy_stop() calls phy_process_state_change() while holding the phydev
lock, so also arrange for phy_state_machine() to do the same, so that
this function is called with consistent locking.

Signed-off-by: Russell King (Oracle) <rmk+kernel@...linux.org.uk>
---
 drivers/net/phy/phy.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/net/phy/phy.c b/drivers/net/phy/phy.c
index df54c137c5f5..1e5218935eb3 100644
--- a/drivers/net/phy/phy.c
+++ b/drivers/net/phy/phy.c
@@ -1506,6 +1506,7 @@ void phy_state_machine(struct work_struct *work)
 	if (err < 0)
 		phy_error_precise(phydev, func, err);
 
+	mutex_lock(&phydev->lock);
 	phy_process_state_change(phydev, old_state);
 
 	/* Only re-schedule a PHY state machine change if we are polling the
@@ -1516,7 +1517,6 @@ void phy_state_machine(struct work_struct *work)
 	 * state machine would be pointless and possibly error prone when
 	 * called from phy_disconnect() synchronously.
 	 */
-	mutex_lock(&phydev->lock);
 	if (phy_polling_mode(phydev) && phy_is_started(phydev))
 		phy_queue_state_machine(phydev, PHY_STATE_TIME);
 	mutex_unlock(&phydev->lock);
-- 
2.30.2