net: phy: meson-gxl: fix interrupt support

If an interrupt is already pending when the interrupt is enabled on the
GXL phy, no IRQ will ever be triggered.

The fix is simply to make sure pending IRQs are cleared before setting
up the irq mask.

Fixes: cf127ff2 ("net: phy: meson-gxl: add interrupt support")
Signed-off-by: Jerome Brunet <jbrunet@baylibre.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

drivers/net/phy/meson-gxl.c

@@ -201,6 +201,7 @@ static int meson_gxl_ack_interrupt(struct phy_device *phydev)
 static int meson_gxl_config_intr(struct phy_device *phydev)
 {
 	u16 val;
+	int ret;
 
 	if (phydev->interrupts == PHY_INTERRUPT_ENABLED) {
 		val = INTSRC_ANEG_PR
@@ -213,6 +214,11 @@ static int meson_gxl_config_intr(struct phy_device *phydev)
 		val = 0;
 	}
 
+	/* Ack any pending IRQ */
+	ret = meson_gxl_ack_interrupt(phydev);
+	if (ret)
+		return ret;
+
 	return phy_write(phydev, INTSRC_MASK, val);
 }