net: phy: keep track of the PHY suspend state

In order to avoid double calls to phydev->drv->suspend and resume, keep
track of whether the PHY has already been suspended as a consequence of
a successful call to phy_suspend(). We will use this in our MDIO bus
suspend/resume hooks to avoid a double suspend call.

Signed-off-by: Florian Fainelli <f.fainelli@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

include/linux/phy.h

@@ -328,6 +328,7 @@ struct phy_c45_device_ids {
  * is_c45:  Set to true if this phy uses clause 45 addressing.
  * is_internal: Set to true if this phy is internal to a MAC.
  * has_fixups: Set to true if this phy has fixups/quirks.
+ * suspended: Set to true if this phy has been suspended successfully.
  * state: state of the PHY for management purposes
  * dev_flags: Device-specific flags used by the PHY driver.
  * addr: Bus address of PHY
@@ -365,6 +366,7 @@ struct phy_device {
 	bool is_c45;
 	bool is_internal;
 	bool has_fixups;
+	bool suspended;
 
 	enum phy_state state;