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authorSean Hefty <sean.hefty@intel.com>2007-03-19 14:31:36 -0800
committerRoland Dreier <rolandd@cisco.com>2007-03-22 14:32:09 -0700
commite07832b66285124038a96b25a2056e91a55d8b1e (patch)
treeff6a8d6cd476a830610a83a558861d05b4026fff /drivers/infiniband
parent60a596dab7c82bdfa5ee7abcee8e0ce385d4ef21 (diff)
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>
Diffstat (limited to 'drivers/infiniband')
-rw-r--r--drivers/infiniband/ulp/ipoib/ipoib_multicast.c6
1 files changed, 3 insertions, 3 deletions
diff --git a/drivers/infiniband/ulp/ipoib/ipoib_multicast.c b/drivers/infiniband/ulp/ipoib/ipoib_multicast.c
index 56c87a81bb6..54fbead4de0 100644
--- a/drivers/infiniband/ulp/ipoib/ipoib_multicast.c
+++ b/drivers/infiniband/ulp/ipoib/ipoib_multicast.c
@@ -644,6 +644,9 @@ static int ipoib_mcast_leave(struct net_device *dev, struct ipoib_mcast *mcast)
struct ipoib_dev_priv *priv = netdev_priv(dev);
int ret = 0;
+ if (test_and_clear_bit(IPOIB_MCAST_FLAG_BUSY, &mcast->flags))
+ ib_sa_free_multicast(mcast->mc);
+
if (test_and_clear_bit(IPOIB_MCAST_FLAG_ATTACHED, &mcast->flags)) {
ipoib_dbg_mcast(priv, "leaving MGID " IPOIB_GID_FMT "\n",
IPOIB_GID_ARG(mcast->mcmember.mgid));
@@ -655,9 +658,6 @@ static int ipoib_mcast_leave(struct net_device *dev, struct ipoib_mcast *mcast)
ipoib_warn(priv, "ipoib_mcast_detach failed (result = %d)\n", ret);
}
- if (test_and_clear_bit(IPOIB_MCAST_FLAG_BUSY, &mcast->flags))
- ib_sa_free_multicast(mcast->mc);
-
return 0;
}