tree ff6a8d6cd476a830610a83a558861d05b4026fff
parent 60a596dab7c82bdfa5ee7abcee8e0ce385d4ef21
author Sean Hefty <sean.hefty@intel.com> 1174343496 -0800
committer Roland Dreier <rolandd@cisco.com> 1174599129 -0700

IPoIB: Fix race in detaching from mcast group before attaching

There's a race between ipoib_mcast_leave() and ipoib_mcast_join_finish()
where we can try to detach from a multicast group before we've
attached to it.  Fix this by reordering the code in ipoib_mcast_leave
to free the multicast group first, which waits for the multicast
callback thread (which calls ipoib_mcast_join_finish()) to complete
before detaching from the group.

Signed-off-by: Sean Hefty <sean.hefty@intel.com>
Signed-off-by: Roland Dreier <rolandd@cisco.com>