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authorArnd Bergmann <arnd@arndb.de>2016-02-10 16:09:02 +0100
committerDavid S. Miller <davem@davemloft.net>2016-02-16 15:37:28 -0500
commit56bb7fd994f4cc163de08006bf68d959027a9f36 (patch)
tree8f6591932bb158fc845e119a0560b8827eff2e8d /net
parentb5e4d0bcf77e56362252a7ced4dbb476425e1655 (diff)
bridge: mdb: avoid uninitialized variable warning
A recent change to the mdb code confused the compiler to the point where it did not realize that the port-group returned from br_mdb_add_group() is always valid when the function returns a nonzero return value, so we get a spurious warning: net/bridge/br_mdb.c: In function 'br_mdb_add': net/bridge/br_mdb.c:542:4: error: 'pg' may be used uninitialized in this function [-Werror=maybe-uninitialized] __br_mdb_notify(dev, entry, RTM_NEWMDB, pg); Slightly rearranging the code in br_mdb_add_group() makes the problem go away, as gcc is clever enough to see that both functions check for 'ret != 0'. Signed-off-by: Arnd Bergmann <arnd@arndb.de> Fixes: 9e8430f8d60d ("bridge: mdb: Passing the port-group pointer to br_mdb module") Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'net')
-rw-r--r--net/bridge/br_mdb.c4
1 files changed, 2 insertions, 2 deletions
diff --git a/net/bridge/br_mdb.c b/net/bridge/br_mdb.c
index 30e105f57f0d..74c278e00225 100644
--- a/net/bridge/br_mdb.c
+++ b/net/bridge/br_mdb.c
@@ -425,8 +425,8 @@ static int br_mdb_add_group(struct net_bridge *br, struct net_bridge_port *port,
mp = br_mdb_ip_get(mdb, group);
if (!mp) {
mp = br_multicast_new_group(br, port, group);
- err = PTR_ERR(mp);
- if (IS_ERR(mp))
+ err = PTR_ERR_OR_ZERO(mp);
+ if (err)
return err;
}