From: Arnd Bergmann Date: Wed, 10 Feb 2016 15:09:02 +0000 (+0100) Subject: bridge: mdb: avoid uninitialized variable warning X-Git-Tag: v4.9.8~2654^2~56 X-Git-Url: http://review.tizen.org/git/?a=commitdiff_plain;h=56bb7fd994f4cc163de08006bf68d959027a9f36;p=platform%2Fkernel%2Flinux-rpi3.git 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 Fixes: 9e8430f8d60d ("bridge: mdb: Passing the port-group pointer to br_mdb module") Signed-off-by: David S. Miller --- diff --git a/net/bridge/br_mdb.c b/net/bridge/br_mdb.c index 30e105f..74c278e 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; }