net: phy: xgmiitorgmii: Support generic PHY status read

paulkocialkowski · davem330 · commit 197f9ab7f08c · 2019-02-15T20:20:10.000-08:00
Some PHY drivers like the generic one do not provide a read_status
callback on their own but rely on genphy_read_status being called
directly.

With the current code, this results in a NULL function pointer call.
Call genphy_read_status instead when there is no specific callback.

Signed-off-by: Paul Kocialkowski &lt;paul.kocialkowski@bootlin.com&gt;
Signed-off-by: David S. Miller &lt;davem@davemloft.net&gt;
diff --git a/drivers/net/phy/xilinx_gmii2rgmii.c b/drivers/net/phy/xilinx_gmii2rgmii.c
@@ -44,7 +44,10 @@ static int xgmiitorgmii_read_status(struct phy_device *phydev)
 	u16 val = 0;
 	int err;
 
-	err = priv->phy_drv->read_status(phydev);
+	if (priv->phy_drv->read_status)
+		err = priv->phy_drv->read_status(phydev);
+	else
+		err = genphy_read_status(phydev);
 	if (err < 0)
 		return err;
 
