Merge branch 'phylib-simplifications'

Heiner Kallweit says:

====================
net: phy: further phylib simplifications after recent changes to the state machine

After the recent changes to the state machine phylib can be further
simplified (w/o having to make any assumptions).
====================
Signed-off-by: David S. Miller <davem@davemloft.net>

drivers/net/phy/phy.c

@@ -723,30 +723,26 @@ static int phy_disable_interrupts(struct phy_device *phydev)
 }
 
 /**
- * phy_change - Called by the phy_interrupt to handle PHY changes
- * @phydev: phy_device struct that interrupted
+ * phy_interrupt - PHY interrupt handler
+ * @irq: interrupt line
+ * @phy_dat: phy_device pointer
+ *
+ * Description: Handle PHY interrupt
  */
-static irqreturn_t phy_change(struct phy_device *phydev)
+static irqreturn_t phy_interrupt(int irq, void *phy_dat)
 {
-	if (phy_interrupt_is_valid(phydev)) {
-		if (phydev->drv->did_interrupt &&
-		    !phydev->drv->did_interrupt(phydev))
-			return IRQ_NONE;
-
-		if (phydev->state == PHY_HALTED)
-			if (phy_disable_interrupts(phydev))
-				goto phy_err;
-	}
+	struct phy_device *phydev = phy_dat;
 
-	mutex_lock(&phydev->lock);
-	if ((PHY_RUNNING == phydev->state) || (PHY_NOLINK == phydev->state))
-		phydev->state = PHY_CHANGELINK;
-	mutex_unlock(&phydev->lock);
+	if (PHY_HALTED == phydev->state)
+		return IRQ_NONE;		/* It can't be ours.  */
+
+	if (phydev->drv->did_interrupt && !phydev->drv->did_interrupt(phydev))
+		return IRQ_NONE;
 
 	/* reschedule state queue work to run as soon as possible */
 	phy_trigger_machine(phydev);
 
-	if (phy_interrupt_is_valid(phydev) && phy_clear_interrupt(phydev))
+	if (phy_clear_interrupt(phydev))
 		goto phy_err;
 	return IRQ_HANDLED;
 
@@ -755,36 +751,6 @@ static irqreturn_t phy_change(struct phy_device *phydev)
 	return IRQ_NONE;
 }
 
-/**
- * phy_change_work - Scheduled by the phy_mac_interrupt to handle PHY changes
- * @work: work_struct that describes the work to be done
- */
-void phy_change_work(struct work_struct *work)
-{
-	struct phy_device *phydev =
-		container_of(work, struct phy_device, phy_queue);
-
-	phy_change(phydev);
-}
-
-/**
- * phy_interrupt - PHY interrupt handler
- * @irq: interrupt line
- * @phy_dat: phy_device pointer
- *
- * Description: When a PHY interrupt occurs, the handler disables
- * interrupts, and uses phy_change to handle the interrupt.
- */
-static irqreturn_t phy_interrupt(int irq, void *phy_dat)
-{
-	struct phy_device *phydev = phy_dat;
-
-	if (PHY_HALTED == phydev->state)
-		return IRQ_NONE;		/* It can't be ours.  */
-
-	return phy_change(phydev);
-}
-
 /**
  * phy_enable_interrupts - Enable the interrupts from the PHY side
  * @phydev: target phy_device struct
@@ -863,7 +829,7 @@ void phy_stop(struct phy_device *phydev)
 	phy_state_machine(&phydev->state_queue.work);
 
 	/* Cannot call flush_scheduled_work() here as desired because
-	 * of rtnl_lock(), but PHY_HALTED shall guarantee phy_change()
+	 * of rtnl_lock(), but PHY_HALTED shall guarantee irq handler
 	 * will not reenable interrupts.
 	 */
 }
@@ -946,9 +912,6 @@ void phy_state_machine(struct work_struct *work)
 		break;
 	case PHY_NOLINK:
 	case PHY_RUNNING:
-		if (!phy_polling_mode(phydev))
-			break;
-		/* fall through */
 	case PHY_CHANGELINK:
 	case PHY_RESUMING:
 		err = phy_check_link_status(phydev);
@@ -1013,7 +976,7 @@ void phy_state_machine(struct work_struct *work)
 void phy_mac_interrupt(struct phy_device *phydev)
 {
 	/* Trigger a state machine change */
-	queue_work(system_power_efficient_wq, &phydev->phy_queue);
+	phy_trigger_machine(phydev);
 }
 EXPORT_SYMBOL(phy_mac_interrupt);
 

drivers/net/phy/phy_device.c

@@ -587,7 +587,6 @@ struct phy_device *phy_device_create(struct mii_bus *bus, int addr, int phy_id,
 
 	mutex_init(&dev->lock);
 	INIT_DELAYED_WORK(&dev->state_queue, phy_state_machine);
-	INIT_WORK(&dev->phy_queue, phy_change_work);
 
 	/* Request the appropriate module unconditionally; don't
 	 * bother trying to do so only if it isn't already loaded,

include/linux/phy.h

@@ -298,7 +298,7 @@ struct phy_device *mdiobus_scan(struct mii_bus *bus, int addr);
  * - timer moves to NOLINK or RUNNING
  *
  * NOLINK: PHY is up, but not currently plugged in.
- * - If the timer notes that the link comes back, we move to RUNNING
+ * - irq or timer will set RUNNING if link comes back
  * - phy_stop moves to HALTED
  *
  * FORCING: PHY is being configured with forced settings
@@ -309,10 +309,7 @@ struct phy_device *mdiobus_scan(struct mii_bus *bus, int addr);
  *
  * RUNNING: PHY is currently up, running, and possibly sending
  * and/or receiving packets
- * - timer will set CHANGELINK if we're polling (this ensures the
- *   link state is polled every other cycle of this state machine,
- *   which makes it every other second)
- * - irq will set CHANGELINK
+ * - irq or timer will set NOLINK if link goes down
  * - phy_stop moves to HALTED
  *
  * CHANGELINK: PHY experienced a change in link state
@@ -372,7 +369,6 @@ struct phy_c45_device_ids {
  * giving up on the current attempt at acquiring a link
  * irq: IRQ number of the PHY's interrupt (-1 if none)
  * phy_timer: The timer for handling the state machine
- * phy_queue: A work_queue for the phy_mac_interrupt
  * attached_dev: The attached enet driver's device instance ptr
  * adjust_link: Callback for the enet controller to respond to
  * changes in the link state.
@@ -457,7 +453,6 @@ struct phy_device {
 	void *priv;
 
 	/* Interrupt and Polling infrastructure */
-	struct work_struct phy_queue;
 	struct delayed_work state_queue;
 
 	struct mutex lock;
@@ -1032,7 +1027,6 @@ int phy_driver_register(struct phy_driver *new_driver, struct module *owner);
 int phy_drivers_register(struct phy_driver *new_driver, int n,
 			 struct module *owner);
 void phy_state_machine(struct work_struct *work);
-void phy_change_work(struct work_struct *work);
 void phy_mac_interrupt(struct phy_device *phydev);
 void phy_start_machine(struct phy_device *phydev);
 void phy_stop_machine(struct phy_device *phydev);