net: phy: xgmiitorgmii: Support generic PHY status read

[ Upstream commit 197f9ab7f08ce4b9ece662f747c3991b2f0fbb57 ]

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.

Fixes: f411a6160bd4 ("net: phy: Add gmiitorgmii converter support")
Signed-off-by: Paul Kocialkowski <paul.kocialkowski@bootlin.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

diff --git a/drivers/net/phy/xilinx_gmii2rgmii.c b/drivers/net/phy/xilinx_gmii2rgmii.c
index 7a14e81..aef5254 100644 (file)
--- a/drivers/net/phy/xilinx_gmii2rgmii.c
+++ b/drivers/net/phy/xilinx_gmii2rgmii.c
@@ -42,7 +42,10 @@ 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;