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authorVladimir Oltean <vladimir.oltean@nxp.com>2021-09-14 16:43:31 +0300
committerJakub Kicinski <kuba@kernel.org>2021-09-16 01:03:36 +0300
commit6a52e73368038f47f6618623d75061dc263b26ae (patch)
treeac6a10ada0817a9c9f979350a31efcbca7a84f1f /net
parent7366c23ff492ad260776a3ee1aaabba9fc773a8b (diff)
downloadlinux-6a52e73368038f47f6618623d75061dc263b26ae.tar.xz
net: dsa: destroy the phylink instance on any error in dsa_slave_phy_setup
DSA supports connecting to a phy-handle, and has a fallback to a non-OF based method of connecting to an internal PHY on the switch's own MDIO bus, if no phy-handle and no fixed-link nodes were present. The -ENODEV error code from the first attempt (phylink_of_phy_connect) is what triggers the second attempt (phylink_connect_phy). However, when the first attempt returns a different error code than -ENODEV, this results in an unbalance of calls to phylink_create and phylink_destroy by the time we exit the function. The phylink instance has leaked. There are many other error codes that can be returned by phylink_of_phy_connect. For example, phylink_validate returns -EINVAL. So this is a practical issue too. Fixes: aab9c4067d23 ("net: dsa: Plug in PHYLINK support") Signed-off-by: Vladimir Oltean <vladimir.oltean@nxp.com> Reviewed-by: Florian Fainelli <f.fainelli@gmail.com> Reviewed-by: Russell King (Oracle) <rmk+kernel@armlinux.org.uk> Link: https://lore.kernel.org/r/20210914134331.2303380-1-vladimir.oltean@nxp.com Signed-off-by: Jakub Kicinski <kuba@kernel.org>
Diffstat (limited to 'net')
-rw-r--r--net/dsa/slave.c12
1 files changed, 5 insertions, 7 deletions
diff --git a/net/dsa/slave.c b/net/dsa/slave.c
index 662ff531d4e2..a2bf2d8ac65b 100644
--- a/net/dsa/slave.c
+++ b/net/dsa/slave.c
@@ -1854,13 +1854,11 @@ static int dsa_slave_phy_setup(struct net_device *slave_dev)
* use the switch internal MDIO bus instead
*/
ret = dsa_slave_phy_connect(slave_dev, dp->index, phy_flags);
- if (ret) {
- netdev_err(slave_dev,
- "failed to connect to port %d: %d\n",
- dp->index, ret);
- phylink_destroy(dp->pl);
- return ret;
- }
+ }
+ if (ret) {
+ netdev_err(slave_dev, "failed to connect to PHY: %pe\n",
+ ERR_PTR(ret));
+ phylink_destroy(dp->pl);
}
return ret;