net: phylib: fix interrupts re-enablement in phy_start

If phy was suspended and is starting, current driver always enable
phy's interrupts, if phy works in polling, phy can raise unexpected
interrupt which will not be handled, the interrupt will block system
enter suspend again. So interrupts should only be re-enabled if phy
works in interrupt.

Signed-off-by: Shaohui Xie <[email protected]>
Reviewed-by: Florian Fainelli <[email protected]>
Signed-off-by: David S. Miller <[email protected]>

Author: Shaohui Xie

drivers/net/phy/phy.c

@@ -790,9 +790,11 @@ void phy_start(struct phy_device *phydev)
 		break;
 	case PHY_HALTED:
 		/* make sure interrupts are re-enabled for the PHY */
-		err = phy_enable_interrupts(phydev);
-		if (err < 0)
-			break;
+		if (phydev->irq != PHY_POLL) {
+			err = phy_enable_interrupts(phydev);
+			if (err < 0)
+				break;
+		}
 
 		phydev->state = PHY_RESUMING;
 		do_resume = true;