net: phy: xilinx_gmii2rgmii: Add check for external phy detection

Add check if an external phy is detected or not before proceeding further to config the external phy. This patch fixes the issue of u-boot hang or reset, if u-boot is not able to communicate with external connected over gmiitorgmii bridge. Signed-off-by: Siva Durga Prasad Paladugu <[email protected]> Signed-off-by: Michal Simek <[email protected]>
pthomas · Feb 27, 2019 · 195c620 · 195c620
1 parent e118bad
commit 195c620
Showing 1 changed file with 5 additions and 0 deletions.
diff --git a/drivers/net/phy/xilinx_gmii2rgmii.c b/drivers/net/phy/xilinx_gmii2rgmii.c
@@ -82,6 +82,11 @@ static int xilinxgmiitorgmii_probe(struct phy_device *phydev)
 					1 << ext_phyaddr,
 					PHY_INTERFACE_MODE_RGMII);
 
+	if (!phydev->priv) {
+		printf("%s, No external phy device found\n", __func__);
+		return -EINVAL;
+	}
+
 	debug("%s, gmii2rgmmi:0x%x, extphy:0x%x\n", __func__, phydev->addr,
 	      ext_phyaddr);