Patch "net: phy: Ensure state transitions are processed from phy_stop()" has been added to the 6.2-stable tree

[Sasha Levin <sashal@xxxxxxxxxx>]

This is a note to let you know that I've just added the patch titled

    net: phy: Ensure state transitions are processed from phy_stop()

to the 6.2-stable tree which can be found at:
    http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary

The filename of the patch is:
     net-phy-ensure-state-transitions-are-processed-from-.patch
and it can be found in the queue-6.2 subdirectory.

If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.



commit 6ffa379a41041ccf237d78ab4428a2f502aeeeb2
Author: Florian Fainelli <f.fainelli@xxxxxxxxx>
Date:   Thu Mar 16 13:33:24 2023 -0700

    net: phy: Ensure state transitions are processed from phy_stop()
    
    [ Upstream commit 4203d84032e28f893594a453bd8bc9c3b15c7334 ]
    
    In the phy_disconnect() -> phy_stop() path, we will be forcibly setting
    the PHY state machine to PHY_HALTED. This invalidates the old_state !=
    phydev->state condition in phy_state_machine() such that we will neither
    display the state change for debugging, nor will we invoke the
    link_change_notify() callback.
    
    Factor the code by introducing phy_process_state_change(), and ensure
    that we process the state change from phy_stop() as well.
    
    Fixes: 5c5f626bcace ("net: phy: improve handling link_change_notify callback")
    Signed-off-by: Florian Fainelli <f.fainelli@xxxxxxxxx>
    Signed-off-by: David S. Miller <davem@xxxxxxxxxxxxx>
    Signed-off-by: Sasha Levin <sashal@xxxxxxxxxx>

diff --git a/drivers/net/phy/phy.c b/drivers/net/phy/phy.c
index e5b6cb1a77f95..a8bf3c752c8a2 100644
--- a/drivers/net/phy/phy.c
+++ b/drivers/net/phy/phy.c
@@ -57,6 +57,18 @@ static const char *phy_state_to_str(enum phy_state st)
 	return NULL;
 }
 
+static void phy_process_state_change(struct phy_device *phydev,
+				     enum phy_state old_state)
+{
+	if (old_state != phydev->state) {
+		phydev_dbg(phydev, "PHY state change %s -> %s\n",
+			   phy_state_to_str(old_state),
+			   phy_state_to_str(phydev->state));
+		if (phydev->drv && phydev->drv->link_change_notify)
+			phydev->drv->link_change_notify(phydev);
+	}
+}
+
 static void phy_link_up(struct phy_device *phydev)
 {
 	phydev->phy_link_change(phydev, true);
@@ -1094,6 +1106,7 @@ EXPORT_SYMBOL(phy_free_interrupt);
 void phy_stop(struct phy_device *phydev)
 {
 	struct net_device *dev = phydev->attached_dev;
+	enum phy_state old_state;
 
 	if (!phy_is_started(phydev) && phydev->state != PHY_DOWN) {
 		WARN(1, "called from state %s\n",
@@ -1102,6 +1115,7 @@ void phy_stop(struct phy_device *phydev)
 	}
 
 	mutex_lock(&phydev->lock);
+	old_state = phydev->state;
 
 	if (phydev->state == PHY_CABLETEST) {
 		phy_abort_cable_test(phydev);
@@ -1112,6 +1126,7 @@ void phy_stop(struct phy_device *phydev)
 		sfp_upstream_stop(phydev->sfp_bus);
 
 	phydev->state = PHY_HALTED;
+	phy_process_state_change(phydev, old_state);
 
 	mutex_unlock(&phydev->lock);
 
@@ -1229,13 +1244,7 @@ void phy_state_machine(struct work_struct *work)
 	if (err < 0)
 		phy_error(phydev);
 
-	if (old_state != phydev->state) {
-		phydev_dbg(phydev, "PHY state change %s -> %s\n",
-			   phy_state_to_str(old_state),
-			   phy_state_to_str(phydev->state));
-		if (phydev->drv && phydev->drv->link_change_notify)
-			phydev->drv->link_change_notify(phydev);
-	}
+	phy_process_state_change(phydev, old_state);
 
 	/* Only re-schedule a PHY state machine change if we are polling the
 	 * PHY, if PHY_MAC_INTERRUPT is set, then we will be moving