Patch "net: phy: Avoid deadlock during phy_error()" has been added to the 4.9-stable tree

Patch "net: phy: Avoid deadlock during phy_error()" has been added to the 4.9-stable tree

[gregkh]

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

    net: phy: Avoid deadlock during phy_error()

to the 4.9-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-avoid-deadlock-during-phy_error.patch
and it can be found in the queue-4.9 subdirectory.

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


>From foo@baz Sat Mar 18 22:03:25 CST 2017
From: Florian Fainelli <f.fainelli@gmail.com>
Date: Fri, 20 Jan 2017 15:31:52 -0800
Subject: net: phy: Avoid deadlock during phy_error()

From: Florian Fainelli <f.fainelli@gmail.com>


[ Upstream commit eab127717a6af54401ba534790c793ec143cd1fc ]

phy_error() is called in the PHY state machine workqueue context, and
calls phy_trigger_machine() which does a cancel_delayed_work_sync() of
the workqueue we execute from, causing a deadlock situation.

Augment phy_trigger_machine() machine with a sync boolean indicating
whether we should use cancel_*_sync() or just cancel_*_work().

Fixes: 3c293f4e08b5 ("net: phy: Trigger state machine on state change and not polling.")
Reported-by: Russell King <rmk+kernel@armlinux.org.uk>
Signed-off-by: Florian Fainelli <f.fainelli@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
---
 drivers/net/phy/phy.c |   14 +++++++++-----
 1 file changed, 9 insertions(+), 5 deletions(-)

--- a/drivers/net/phy/phy.c
+++ b/drivers/net/phy/phy.c
@@ -611,14 +611,18 @@ void phy_start_machine(struct phy_device
  * phy_trigger_machine - trigger the state machine to run
  *
  * @phydev: the phy_device struct
+ * @sync: indicate whether we should wait for the workqueue cancelation
  *
  * Description: There has been a change in state which requires that the
  *   state machine runs.
  */
 
-static void phy_trigger_machine(struct phy_device *phydev)
+static void phy_trigger_machine(struct phy_device *phydev, bool sync)
 {
-	cancel_delayed_work_sync(&phydev->state_queue);
+	if (sync)
+		cancel_delayed_work_sync(&phydev->state_queue);
+	else
+		cancel_delayed_work(&phydev->state_queue);
 	queue_delayed_work(system_power_efficient_wq, &phydev->state_queue, 0);
 }
 
@@ -655,7 +659,7 @@ static void phy_error(struct phy_device
 	phydev->state = PHY_HALTED;
 	mutex_unlock(&phydev->lock);
 
-	phy_trigger_machine(phydev);
+	phy_trigger_machine(phydev, false);
 }
 
 /**
@@ -817,7 +821,7 @@ void phy_change(struct work_struct *work
 	}
 
 	/* reschedule state queue work to run as soon as possible */
-	phy_trigger_machine(phydev);
+	phy_trigger_machine(phydev, true);
 	return;
 
 ignore:
@@ -907,7 +911,7 @@ void phy_start(struct phy_device *phydev
 	if (do_resume)
 		phy_resume(phydev);
 
-	phy_trigger_machine(phydev);
+	phy_trigger_machine(phydev, true);
 }
 EXPORT_SYMBOL(phy_start);
 


Patches currently in stable-queue which might be from f.fainelli@gmail.com are

queue-4.9/net-phy-avoid-deadlock-during-phy_error.patch