net: phy: Tell caller result of phy_change()

In 664fcf123a30e (net: phy: Threaded interrupts allow some simplification)
the phy_interrupt system was changed to use a traditional threaded
interrupt scheme instead of a workqueue approach.

With this change, the phy status check moved into phy_change, which
did not report back to the caller whether or not the interrupt was
handled. This means that, in the case of a shared phy interrupt,
only the first phydev's interrupt registers are checked (since
phy_interrupt() would always return IRQ_HANDLED). This leads to
interrupt storms when it is a secondary device that's actually the
interrupt source.

Signed-off-by: Brad Mouring <brad.mouring@ni.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

diff --git a/drivers/net/phy/phy.c b/drivers/net/phy/phy.c
index a6f924f..9aabfa1 100644 (file)
--- a/drivers/net/phy/phy.c
+++ b/drivers/net/phy/phy.c
@@ -617,6 +617,77 @@ static void phy_error(struct phy_device *phydev)
        phy_trigger_machine(phydev, false);
 }
 
+/**
+ * phy_disable_interrupts - Disable the PHY interrupts from the PHY side
+ * @phydev: target phy_device struct
+ */
+static int phy_disable_interrupts(struct phy_device *phydev)
+{
+       int err;
+
+       /* Disable PHY interrupts */
+       err = phy_config_interrupt(phydev, PHY_INTERRUPT_DISABLED);
+       if (err)
+               goto phy_err;
+
+       /* Clear the interrupt */
+       err = phy_clear_interrupt(phydev);
+       if (err)
+               goto phy_err;
+
+       return 0;
+
+phy_err:
+       phy_error(phydev);
+
+       return err;
+}
+
+/**
+ * phy_change - Called by the phy_interrupt to handle PHY changes
+ * @phydev: phy_device struct that interrupted
+ */
+static irqreturn_t phy_change(struct phy_device *phydev)
+{
+       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;
+       }
+
+       mutex_lock(&phydev->lock);
+       if ((PHY_RUNNING == phydev->state) || (PHY_NOLINK == phydev->state))
+               phydev->state = PHY_CHANGELINK;
+       mutex_unlock(&phydev->lock);
+
+       /* reschedule state queue work to run as soon as possible */
+       phy_trigger_machine(phydev, true);
+
+       if (phy_interrupt_is_valid(phydev) && phy_clear_interrupt(phydev))
+               goto phy_err;
+       return IRQ_HANDLED;
+
+phy_err:
+       phy_error(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
@@ -632,9 +703,7 @@ static irqreturn_t phy_interrupt(int irq, void *phy_dat)
        if (PHY_HALTED == phydev->state)
                return IRQ_NONE;                /* It can't be ours.  */
 
-       phy_change(phydev);
-
-       return IRQ_HANDLED;
+       return phy_change(phydev);
 }
 
 /**
@@ -651,32 +720,6 @@ static int phy_enable_interrupts(struct phy_device *phydev)
        return phy_config_interrupt(phydev, PHY_INTERRUPT_ENABLED);
 }
 
-/**
- * phy_disable_interrupts - Disable the PHY interrupts from the PHY side
- * @phydev: target phy_device struct
- */
-static int phy_disable_interrupts(struct phy_device *phydev)
-{
-       int err;
-
-       /* Disable PHY interrupts */
-       err = phy_config_interrupt(phydev, PHY_INTERRUPT_DISABLED);
-       if (err)
-               goto phy_err;
-
-       /* Clear the interrupt */
-       err = phy_clear_interrupt(phydev);
-       if (err)
-               goto phy_err;
-
-       return 0;
-
-phy_err:
-       phy_error(phydev);
-
-       return err;
-}
-
 /**
  * phy_start_interrupts - request and enable interrupts for a PHY device
  * @phydev: target phy_device struct
@@ -719,50 +762,6 @@ int phy_stop_interrupts(struct phy_device *phydev)
 }
 EXPORT_SYMBOL(phy_stop_interrupts);
 
-/**
- * phy_change - Called by the phy_interrupt to handle PHY changes
- * @phydev: phy_device struct that interrupted
- */
-void phy_change(struct phy_device *phydev)
-{
-       if (phy_interrupt_is_valid(phydev)) {
-               if (phydev->drv->did_interrupt &&
-                   !phydev->drv->did_interrupt(phydev))
-                       return;
-
-               if (phydev->state == PHY_HALTED)
-                       if (phy_disable_interrupts(phydev))
-                               goto phy_err;
-       }
-
-       mutex_lock(&phydev->lock);
-       if ((PHY_RUNNING == phydev->state) || (PHY_NOLINK == phydev->state))
-               phydev->state = PHY_CHANGELINK;
-       mutex_unlock(&phydev->lock);
-
-       /* reschedule state queue work to run as soon as possible */
-       phy_trigger_machine(phydev, true);
-
-       if (phy_interrupt_is_valid(phydev) && phy_clear_interrupt(phydev))
-               goto phy_err;
-       return;
-
-phy_err:
-       phy_error(phydev);
-}
-
-/**
- * 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_stop - Bring down the PHY link, and stop checking the status
  * @phydev: target phy_device struct

diff --git a/include/linux/phy.h b/include/linux/phy.h
index d706953..b260fb3 100644 (file)
--- a/include/linux/phy.h
+++ b/include/linux/phy.h
@@ -1012,7 +1012,6 @@ 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(struct phy_device *phydev);
 void phy_change_work(struct work_struct *work);
 void phy_mac_interrupt(struct phy_device *phydev);
 void phy_start_machine(struct phy_device *phydev);