netdev - [PATCH] phylib: fix PAL state machine restart on resume

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Message-Id: <1284451921-9937-1-git-send-email-simon@sequanux.org>
Date:	Tue, 14 Sep 2010 10:12:01 +0200
From:	Simon Guinot <simon@...uanux.org>
To:	netdev@...r.kernel.org
Cc:	Simon Guinot <sguinot@...ie.com>
Subject: [PATCH] phylib: fix PAL state machine restart on resume

From: Simon Guinot <sguinot@...ie.com>

On resume, before starting the PAL state machine, check if the
adjust_link() method is well supplied. If not, this would lead to a
NULL pointer dereference in the phy_state_machine() function.

This scenario can happen if the Ethernet driver call manually the PHY
functions instead of using the PAL state machine. The mv643xx_eth driver
is a such example.

Signed-off-by: Simon Guinot <sguinot@...ie.com>
---
 drivers/net/phy/mdio_bus.c |    4 ++--
 1 files changed, 2 insertions(+), 2 deletions(-)

diff --git a/drivers/net/phy/mdio_bus.c b/drivers/net/phy/mdio_bus.c
index 6a6b819..6c58da2 100644
--- a/drivers/net/phy/mdio_bus.c
+++ b/drivers/net/phy/mdio_bus.c
@@ -308,7 +308,7 @@ static int mdio_bus_suspend(struct device *dev)
 	 * may call phy routines that try to grab the same lock, and that may
 	 * lead to a deadlock.
 	 */
-	if (phydev->attached_dev)
+	if (phydev->attached_dev && phydev->adjust_link)
 		phy_stop_machine(phydev);
 
 	if (!mdio_bus_phy_may_suspend(phydev))
@@ -331,7 +331,7 @@ static int mdio_bus_resume(struct device *dev)
 		return ret;
 
 no_resume:
-	if (phydev->attached_dev)
+	if (phydev->attached_dev && phydev->adjust_link)
 		phy_start_machine(phydev, NULL);
 
 	return 0;
-- 
1.6.3.1

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