path: root/drivers/net/phy/mdio_bus.c
diff options
authorSimon Guinot <sguinot@lacie.com>2010-09-13 22:12:01 +0000
committerDavid S. Miller <davem@davemloft.net>2010-09-14 14:31:03 -0700
commitfddd91016d16277a32727ad272cf2edd3d309c90 (patch)
treede26d726a987469aabe804d4b32733c559b9291c /drivers/net/phy/mdio_bus.c
parentef885afbf8a37689afc1d9d545e2f3e7a8276c17 (diff)
phylib: fix PAL state machine restart on resume
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@lacie.com> Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'drivers/net/phy/mdio_bus.c')
1 files changed, 2 insertions, 2 deletions
diff --git a/drivers/net/phy/mdio_bus.c b/drivers/net/phy/mdio_bus.c
index 6a6b8199a0d6..6c58da2b882c 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)
if (!mdio_bus_phy_may_suspend(phydev))
@@ -331,7 +331,7 @@ static int mdio_bus_resume(struct device *dev)
return ret;
- if (phydev->attached_dev)
+ if (phydev->attached_dev && phydev->adjust_link)
phy_start_machine(phydev, NULL);
return 0;