net: of_mdio: do not overwrite PHY interrupt configuration

If irq_of_parse_and_map fails to find an interrupt line for a given PHY,
we will force the PHY interrupt to be PHY_POLL, completely overriding
the previous value that the MDIO bus may have set for us (e.g:
PHY_IGNORE_INTERRUPT). In case of failure, just restore the previous
value.

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

1 files changed, 3 insertions, 2 deletions

diff --git a/drivers/of/of_mdio.c b/drivers/of/of_mdio.c
index f93ebca0fcb7..14feffc36964 100644
--- a/drivers/of/of_mdio.c
+++ b/drivers/of/of_mdio.c
@@ -27,7 +27,7 @@ static int of_mdiobus_register_phy(struct mii_bus *mdio, struct device_node *chi
 {
         struct phy_device *phy;
         bool is_c45;
-        int rc;
+        int rc, prev_irq;
 
         is_c45 = of_device_is_compatible(child,
                                          "ethernet-phy-ieee802.3-c45");
@@ -37,10 +37,11 @@ static int of_mdiobus_register_phy(struct mii_bus *mdio, struct device_node *chi
                 return 1;
 
         if (mdio->irq) {
+                prev_irq = mdio->irq[addr];
                 mdio->irq[addr] =
                         irq_of_parse_and_map(child, 0);
                 if (!mdio->irq[addr])
-                        mdio->irq[addr] = PHY_POLL;
+                        mdio->irq[addr] = prev_irq;
         }
 
         /* Associate the OF node with the device structure so it