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authorMichael S. Tsirkin <mst@mellanox.co.il>2006-03-02 11:07:47 -0800
committerRoland Dreier <rolandd@cisco.com>2006-03-20 10:08:20 -0800
commit9acf6a8570dcfc9f55724b8b71099fc8768e8c26 (patch)
tree5b265bf0474f321722d2690b5b5dc57cde80690e /drivers/infiniband
parent54d07e2a1ead2f093ce054cda2e0f5ec163c650c (diff)
downloadop-kernel-dev-9acf6a8570dcfc9f55724b8b71099fc8768e8c26.zip
op-kernel-dev-9acf6a8570dcfc9f55724b8b71099fc8768e8c26.tar.gz
IPoIB: Fix multicast race between canceling and completing
ipoib_mcast_stop_thread currently tests mcast->query and if it is NULL, does not perform wait_for_completion on the mcast and frees the mcast object directly. However, since both operations are done without locking, it is possible that ipoib_mcast_join_complete is in progress on this mcast object and has set mcast->query to NULL already. Solve this by: - taking priv->lock before we change mcast->query in ipoib_mcast_join_complete, and keeping it until we no longer need the mcast object - taking priv->lock around mcast->query test in ipoib_mcast_stop_thread Signed-off-by: Michael S. Tsirkin <mst@mellanox.co.il> Signed-off-by: Roland Dreier <rolandd@cisco.com>
Diffstat (limited to 'drivers/infiniband')
-rw-r--r--drivers/infiniband/ulp/ipoib/ipoib_multicast.c15
1 files changed, 12 insertions, 3 deletions
diff --git a/drivers/infiniband/ulp/ipoib/ipoib_multicast.c b/drivers/infiniband/ulp/ipoib/ipoib_multicast.c
index e5dc2a0..fde442a 100644
--- a/drivers/infiniband/ulp/ipoib/ipoib_multicast.c
+++ b/drivers/infiniband/ulp/ipoib/ipoib_multicast.c
@@ -437,9 +437,11 @@ static void ipoib_mcast_join_complete(int status,
if (mcast->backoff > IPOIB_MAX_BACKOFF_SECONDS)
mcast->backoff = IPOIB_MAX_BACKOFF_SECONDS;
+ mutex_lock(&mcast_mutex);
+
+ spin_lock_irq(&priv->lock);
mcast->query = NULL;
- mutex_lock(&mcast_mutex);
if (test_bit(IPOIB_MCAST_RUN, &priv->flags)) {
if (status == -ETIMEDOUT)
queue_work(ipoib_workqueue, &priv->mcast_task);
@@ -448,6 +450,7 @@ static void ipoib_mcast_join_complete(int status,
mcast->backoff * HZ);
} else
complete(&mcast->done);
+ spin_unlock_irq(&priv->lock);
mutex_unlock(&mcast_mutex);
return;
@@ -635,21 +638,27 @@ int ipoib_mcast_stop_thread(struct net_device *dev, int flush)
if (flush)
flush_workqueue(ipoib_workqueue);
+ spin_lock_irq(&priv->lock);
if (priv->broadcast && priv->broadcast->query) {
ib_sa_cancel_query(priv->broadcast->query_id, priv->broadcast->query);
priv->broadcast->query = NULL;
+ spin_unlock_irq(&priv->lock);
ipoib_dbg_mcast(priv, "waiting for bcast\n");
wait_for_completion(&priv->broadcast->done);
- }
+ } else
+ spin_unlock_irq(&priv->lock);
list_for_each_entry(mcast, &priv->multicast_list, list) {
+ spin_lock_irq(&priv->lock);
if (mcast->query) {
ib_sa_cancel_query(mcast->query_id, mcast->query);
mcast->query = NULL;
+ spin_unlock_irq(&priv->lock);
ipoib_dbg_mcast(priv, "waiting for MGID " IPOIB_GID_FMT "\n",
IPOIB_GID_ARG(mcast->mcmember.mgid));
wait_for_completion(&mcast->done);
- }
+ } else
+ spin_unlock_irq(&priv->lock);
}
return 0;
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