From: Erez Shitrit <erezsh@xxxxxxxxxxxx>
The neigh_reap_task is self restarting, but so long as we call
cancel_delayed_work_sync() it will be guaranteed to not be running and
never start again. Thus we don't need to have the racy
IPOIB_STOP_NEIGH_GC bit, or the confusing mismatch of places sometimes
calling flush_workqueue after the cancel.
This fixes a situation where the GC work could have been left running
in some rare situations.
Signed-off-by: Erez Shitrit <erezsh@xxxxxxxxxxxx>
Signed-off-by: Leon Romanovsky <leonro@xxxxxxxxxxxx>
---
drivers/infiniband/ulp/ipoib/ipoib_main.c | 8 ++++----
1 file changed, 4 insertions(+), 4 deletions(-)
diff --git a/drivers/infiniband/ulp/ipoib/ipoib_main.c b/drivers/infiniband/ulp/ipoib/ipoib_main.c
index 7ca9013bf05c..7cd42619deb2 100644
--- a/drivers/infiniband/ulp/ipoib/ipoib_main.c
+++ b/drivers/infiniband/ulp/ipoib/ipoib_main.c
@@ -1661,7 +1661,7 @@ static void ipoib_neigh_hash_uninit(struct net_device *dev)
/* Stop GC if called at init fail need to cancel work */
stopped = test_and_set_bit(IPOIB_STOP_NEIGH_GC, &priv->flags);
if (!stopped)
- cancel_delayed_work(&priv->neigh_reap_task);
+ cancel_delayed_work_sync(&priv->neigh_reap_task);
ipoib_flush_neighs(priv);
@@ -1837,7 +1837,7 @@ void ipoib_dev_cleanup(struct net_device *dev)
list_for_each_entry_safe(cpriv, tcpriv, &priv->child_intfs, list) {
/* Stop GC on child */
set_bit(IPOIB_STOP_NEIGH_GC, &cpriv->flags);
- cancel_delayed_work(&cpriv->neigh_reap_task);
+ cancel_delayed_work_sync(&cpriv->neigh_reap_task);
unregister_netdevice_queue(cpriv->dev, &head);
}
unregister_netdevice_many(&head);
@@ -2346,7 +2346,7 @@ static struct net_device *ipoib_add_port(const char *format,
flush_workqueue(ipoib_workqueue);
/* Stop GC if started before flush */
set_bit(IPOIB_STOP_NEIGH_GC, &priv->flags);
- cancel_delayed_work(&priv->neigh_reap_task);
+ cancel_delayed_work_sync(&priv->neigh_reap_task);
flush_workqueue(priv->wq);
ipoib_dev_cleanup(priv->dev);
@@ -2412,7 +2412,7 @@ static void ipoib_remove_one(struct ib_device *device, void *client_data)
/* Stop GC */
set_bit(IPOIB_STOP_NEIGH_GC, &priv->flags);
- cancel_delayed_work(&priv->neigh_reap_task);
+ cancel_delayed_work_sync(&priv->neigh_reap_task);
flush_workqueue(priv->wq);
/* Wrap rtnl_lock/unlock with mutex to protect sysfs calls */
--
2.14.4
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