[PATCH net v1 1/2] net: phy: split phy_probe() error paths

[Xuanqiang Luo]

From: Xuanqiang Luo <luoxuanqiang@xxxxxxxxxx>

phy_probe() uses one cleanup path for failures at every initialization
stage. This runs cleanup for resources that have not been initialized
and leaves phy_setup_ports() relying on its caller to remove an SFP
upstream after a partial failure.

Make phy_setup_ports() unwind the SFP upstream before removing its ports.
Then split the phy_probe() cleanup so each failure path unwinds only the
resources that may have been initialized.

Signed-off-by: Xuanqiang Luo <luoxuanqiang@xxxxxxxxxx>
---
 drivers/net/phy/phy_device.c | 23 ++++++++++++++---------
 1 file changed, 14 insertions(+), 9 deletions(-)

diff --git a/drivers/net/phy/phy_device.c b/drivers/net/phy/phy_device.c
index 0615228459ef4..f8e434daab66e 100644
--- a/drivers/net/phy/phy_device.c
+++ b/drivers/net/phy/phy_device.c
@@ -3556,6 +3556,9 @@ static int phy_setup_ports(struct phy_device *phydev)
 	return 0;
 
 out:
+	sfp_bus_del_upstream(phydev->sfp_bus);
+	phydev->sfp_bus = NULL;
+
 	phy_cleanup_ports(phydev);
 	return ret;
 }
@@ -3681,7 +3684,7 @@ static int phy_probe(struct device *dev)
 	if (phydev->drv->probe) {
 		err = phydev->drv->probe(phydev);
 		if (err)
-			goto out;
+			goto out_reset;
 	}
 
 	phy_disable_interrupts(phydev);
@@ -3702,7 +3705,7 @@ static int phy_probe(struct device *dev)
 		err = genphy_read_abilities(phydev);
 
 	if (err)
-		goto out;
+		goto out_reset;
 
 	if (!linkmode_test_bit(ETHTOOL_LINK_MODE_Autoneg_BIT,
 			       phydev->supported))
@@ -3719,7 +3722,7 @@ static int phy_probe(struct device *dev)
 
 	err = phy_setup_ports(phydev);
 	if (err)
-		goto out;
+		goto out_reset;
 
 	phy_advertise_supported(phydev);
 
@@ -3728,7 +3731,7 @@ static int phy_probe(struct device *dev)
 	 */
 	err = genphy_c45_read_eee_adv(phydev, phydev->advertising_eee);
 	if (err)
-		goto out;
+		goto out_ports;
 
 	/* Get the EEE modes we want to prohibit. */
 	of_set_phy_eee_broken(phydev);
@@ -3781,20 +3784,22 @@ static int phy_probe(struct device *dev)
 	if (IS_ENABLED(CONFIG_PHYLIB_LEDS) && !phy_driver_is_genphy(phydev)) {
 		err = of_phy_leds(phydev);
 		if (err)
-			goto out;
+			goto out_led_triggers;
 	}
 
 	return 0;
 
-out:
+out_led_triggers:
+	if (!phydev->is_on_sfp_module)
+		phy_led_triggers_unregister(phydev);
+
+out_ports:
 	sfp_bus_del_upstream(phydev->sfp_bus);
 	phydev->sfp_bus = NULL;
 
 	phy_cleanup_ports(phydev);
 
-	if (!phydev->is_on_sfp_module)
-		phy_led_triggers_unregister(phydev);
-
+out_reset:
 	/* Re-assert the reset signal on error */
 	phy_device_reset(phydev, 1);
 
-- 
2.43.0