Commit 8d2cae06 authored by Roland Dreier's avatar Roland Dreier
Browse files

[PATCH] IPoIB: Don't flush workqueue from within workqueue



ipoib_mcast_restart_task() is always called from within the
single-threaded IPoIB workqueue, so flushing the workqueue from within
the function can lead to a recursion overflow.  But since we're
running in a single-threaded workqueue, we're already synchronized
against other items in the workqueue, so just get rid of the flush in
ipoib_mcast_restart_task().

Signed-off-by: default avatarRoland Dreier <rolandd@cisco.com>
parent eff4c654
......@@ -257,7 +257,7 @@ void ipoib_mcast_send(struct net_device *dev, union ib_gid *mgid,
void ipoib_mcast_restart_task(void *dev_ptr);
int ipoib_mcast_start_thread(struct net_device *dev);
int ipoib_mcast_stop_thread(struct net_device *dev);
int ipoib_mcast_stop_thread(struct net_device *dev, int flush);
void ipoib_mcast_dev_down(struct net_device *dev);
void ipoib_mcast_dev_flush(struct net_device *dev);
......
......@@ -432,7 +432,7 @@ int ipoib_ib_dev_down(struct net_device *dev)
flush_workqueue(ipoib_workqueue);
}
ipoib_mcast_stop_thread(dev);
ipoib_mcast_stop_thread(dev, 1);
/*
* Flush the multicast groups first so we stop any multicast joins. The
......@@ -599,7 +599,7 @@ void ipoib_ib_dev_cleanup(struct net_device *dev)
ipoib_dbg(priv, "cleaning up ib_dev\n");
ipoib_mcast_stop_thread(dev);
ipoib_mcast_stop_thread(dev, 1);
/* Delete the broadcast address and the local address */
ipoib_mcast_dev_down(dev);
......
......@@ -598,7 +598,7 @@ int ipoib_mcast_start_thread(struct net_device *dev)
return 0;
}
int ipoib_mcast_stop_thread(struct net_device *dev)
int ipoib_mcast_stop_thread(struct net_device *dev, int flush)
{
struct ipoib_dev_priv *priv = netdev_priv(dev);
struct ipoib_mcast *mcast;
......@@ -610,7 +610,8 @@ int ipoib_mcast_stop_thread(struct net_device *dev)
cancel_delayed_work(&priv->mcast_task);
up(&mcast_mutex);
flush_workqueue(ipoib_workqueue);
if (flush)
flush_workqueue(ipoib_workqueue);
if (priv->broadcast && priv->broadcast->query) {
ib_sa_cancel_query(priv->broadcast->query_id, priv->broadcast->query);
......@@ -832,7 +833,7 @@ void ipoib_mcast_restart_task(void *dev_ptr)
ipoib_dbg_mcast(priv, "restarting multicast task\n");
ipoib_mcast_stop_thread(dev);
ipoib_mcast_stop_thread(dev, 0);
spin_lock_irqsave(&priv->lock, flags);
......
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