phylib: Move workqueue initialization to a proper place

commit 541cd3ee00a4fe975b22fac6a3bc846bacef37f7 ("phylib: Fix deadlock
on resume") caused TI DaVinci EMAC ethernet driver to oops upon resume:

 PM: resume of devices complete after 237.098 msecs
 Restarting tasks ... done.
 kernel BUG at kernel/workqueue.c:354!
 Unable to handle kernel NULL pointer dereference at virtual address 00000000
 [...]
 Backtrace:
 [<c002c598>] (__bug+0x0/0x2c) from [<c0052a54>] (queue_delayed_work_on+0x74/0xf8)
 [<c00529e0>] (queue_delayed_work_on+0x0/0xf8) from [<c0052b30>] (queue_delayed_work+0x2c/0x30)

The oops pops up because TI DaVinci EMAC driver detaches PHY on
suspend and attaches it back on resume. Attaching makes phylib call
phy_start_machine() that initializes a workqueue. On the other hand,
PHY's resume routine will call phy_start_machine() again, and that
will cause the oops since we just destroyed the already scheduled
workqueue.

This patch fixes the issue by moving workqueue initialization to
phy_device_create().

p.s. We don't see this oops with ucc_geth and gianfar drivers because
they perform a fine-grained suspend, i.e. they just stop the PHYs
without detaching.

Reported-by: Sekhar Nori <nsekhar@ti.com>
Signed-off-by: Anton Vorontsov <avorontsov@ru.mvista.com>
Tested-by: Sekhar Nori <nsekhar@ti.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

drivers/net/phy/phy.c

@@ -410,7 +410,6 @@ EXPORT_SYMBOL(phy_start_aneg);
 
 
 static void phy_change(struct work_struct *work);
-static void phy_state_machine(struct work_struct *work);
 
 /**
  * phy_start_machine - start PHY state machine tracking
@@ -430,7 +429,6 @@ void phy_start_machine(struct phy_device *phydev,
 {
 	phydev->adjust_state = handler;
 
-	INIT_DELAYED_WORK(&phydev->state_queue, phy_state_machine);
 	schedule_delayed_work(&phydev->state_queue, HZ);
 }
 
@@ -761,7 +759,7 @@ EXPORT_SYMBOL(phy_start);
  * phy_state_machine - Handle the state machine
  * @work: work_struct that describes the work to be done
  */
-static void phy_state_machine(struct work_struct *work)
+void phy_state_machine(struct work_struct *work)
 {
 	struct delayed_work *dwork = to_delayed_work(work);
 	struct phy_device *phydev =

drivers/net/phy/phy_device.c

@@ -177,6 +177,7 @@ struct phy_device* phy_device_create(struct mii_bus *bus, int addr, int phy_id)
 	dev->state = PHY_DOWN;
 
 	mutex_init(&dev->lock);
+	INIT_DELAYED_WORK(&dev->state_queue, phy_state_machine);
 
 	return dev;
 }

include/linux/phy.h

@@ -485,6 +485,7 @@ void phy_driver_unregister(struct phy_driver *drv);
 int phy_driver_register(struct phy_driver *new_driver);
 void phy_prepare_link(struct phy_device *phydev,
 		void (*adjust_link)(struct net_device *));
+void phy_state_machine(struct work_struct *work);
 void phy_start_machine(struct phy_device *phydev,
 		void (*handler)(struct net_device *));
 void phy_stop_machine(struct phy_device *phydev);