netdev - [PATCH net] net: phylink: move phy_device_free() to correctly release phy device

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Date:   Tue, 31 Jan 2023 11:02:42 +0100
From:   Clément Léger <clement.leger@...tlin.com>
To:     Russell King <linux@...linux.org.uk>, Andrew Lunn <andrew@...n.ch>,
        Heiner Kallweit <hkallweit1@...il.com>,
        "David S. Miller" <davem@...emloft.net>,
        Eric Dumazet <edumazet@...gle.com>,
        Jakub Kicinski <kuba@...nel.org>,
        Paolo Abeni <pabeni@...hat.com>,
        Grant Likely <grant.likely@....com>,
        Calvin Johnson <calvin.johnson@....nxp.com>,
        Ioana Ciornei <ioana.ciornei@....com>
Cc:     Clément Léger <clement.leger@...tlin.com>,
        netdev@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: [PATCH net] net: phylink: move phy_device_free() to correctly release phy device

After calling fwnode_phy_find_device(), the phy device refcount is
incremented. Then, when the phy device is attached to a netdev with
phy_attach_direct(), the refcount is also incremented but only
decremented in the caller if phy_attach_direct() fails. Move
phy_device_free() before the "if" to always release it correctly.
Indeed, either phy_attach_direct() failed and we don't want to keep a
reference to the phydev or it succeeded and a reference has been taken
internally.

Fixes: 25396f680dd6 ("net: phylink: introduce phylink_fwnode_phy_connect()")
Signed-off-by: Clément Léger <clement.leger@...tlin.com>
---
 drivers/net/phy/phylink.c | 5 ++---
 1 file changed, 2 insertions(+), 3 deletions(-)

diff --git a/drivers/net/phy/phylink.c b/drivers/net/phy/phylink.c
index 09cc65c0da93..4d2519cdb801 100644
--- a/drivers/net/phy/phylink.c
+++ b/drivers/net/phy/phylink.c
@@ -1812,10 +1812,9 @@ int phylink_fwnode_phy_connect(struct phylink *pl,
 
 	ret = phy_attach_direct(pl->netdev, phy_dev, flags,
 				pl->link_interface);
-	if (ret) {
-		phy_device_free(phy_dev);
+	phy_device_free(phy_dev);
+	if (ret)
 		return ret;
-	}
 
 	ret = phylink_bringup_phy(pl, phy_dev, pl->link_config.interface);
 	if (ret)
-- 
2.39.0