net: phylib: add link_change_notify callback to phy device

Add a notify callback to inform phy drivers when the core is about to
do its link adjustment. No change for drivers that do not implement
this callback.

Signed-off-by: Daniel Mack <zonque@gmail.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 3bc079a..f7c6181 100644 (file)
--- a/drivers/net/phy/phy.c
+++ b/drivers/net/phy/phy.c
@@ -720,6 +720,9 @@ void phy_state_machine(struct work_struct *work)
 
        mutex_lock(&phydev->lock);
 
+       if (phydev->drv->link_change_notify)
+               phydev->drv->link_change_notify(phydev);
+
        switch (phydev->state) {
        case PHY_DOWN:
        case PHY_STARTING:

diff --git a/include/linux/phy.h b/include/linux/phy.h
index 864ddaf..6804144 100644 (file)
--- a/include/linux/phy.h
+++ b/include/linux/phy.h
@@ -536,6 +536,15 @@ struct phy_driver {
        /* See set_wol, but for checking whether Wake on LAN is enabled. */
        void (*get_wol)(struct phy_device *dev, struct ethtool_wolinfo *wol);
 
+       /*
+        * Called to inform a PHY device driver when the core is about to
+        * change the link state. This callback is supposed to be used as
+        * fixup hook for drivers that need to take action when the link
+        * state changes. Drivers are by no means allowed to mess with the
+        * PHY device structure in their implementations.
+        */
+       void (*link_change_notify)(struct phy_device *dev);
+
        struct device_driver driver;
 };
 #define to_phy_driver(d) container_of(d, struct phy_driver, driver)