net: phy: fix PHY_RUNNING in phy_state_machine

Currently, if phy state is PHY_RUNNING, we always register a CHANGE
when phy works in polling or interrupt ignored, this will make the
adjust_link being called even the phy link did Not changed.

checking the phy link to make sure the link did changed before we
register a CHANGE, if link did not changed, we do nothing.

Signed-off-by: Shaohui Xie <Shaohui.Xie@freescale.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 b2197b506acbe86f3540d5ae1d8334129c2bbe57..1e1fbb049ec63b79c1d8255c517364f739a8d38b 100644 (file)
--- a/drivers/net/phy/phy.c
+++ b/drivers/net/phy/phy.c
@@ -811,6 +811,7 @@ void phy_state_machine(struct work_struct *work)
        bool needs_aneg = false, do_suspend = false;
        enum phy_state old_state;
        int err = 0;
+       int old_link;
 
        mutex_lock(&phydev->lock);
 
@@ -896,11 +897,18 @@ void phy_state_machine(struct work_struct *work)
                phydev->adjust_link(phydev->attached_dev);
                break;
        case PHY_RUNNING:
-               /* Only register a CHANGE if we are
-                * polling or ignoring interrupts
+               /* Only register a CHANGE if we are polling or ignoring
+                * interrupts and link changed since latest checking.
                 */
-               if (!phy_interrupt_is_valid(phydev))
-                       phydev->state = PHY_CHANGELINK;
+               if (!phy_interrupt_is_valid(phydev)) {
+                       old_link = phydev->link;
+                       err = phy_read_status(phydev);
+                       if (err)
+                               break;
+
+                       if (old_link != phydev->link)
+                               phydev->state = PHY_CHANGELINK;
+               }
                break;
        case PHY_CHANGELINK:
                err = phy_read_status(phydev);