[git patch review 5/8] IPoIB: protect child list in ipoib_ib_dev_flush

[Roland Dreier <rolandd@cisco.com>]

race condition: ipoib_ib_dev_flush is accessing child list without locks.

Signed-off-by: Michael S. Tsirkin <mst@mellanox.co.il>
Signed-off-by: Roland Dreier <rolandd@cisco.com>

---

 drivers/infiniband/ulp/ipoib/ipoib_ib.c |    4 ++++
 1 files changed, 4 insertions(+), 0 deletions(-)

applies-to: e58f418dd8e64675b1dbaa6db92d7c1e606d1506
4f71055a45a503273c039d80db8ba9b13cb17549
diff --git a/drivers/infiniband/ulp/ipoib/ipoib_ib.c b/drivers/infiniband/ulp/ipoib/ipoib_ib.c
index 54ef2fe..2388580 100644
--- a/drivers/infiniband/ulp/ipoib/ipoib_ib.c
+++ b/drivers/infiniband/ulp/ipoib/ipoib_ib.c
@@ -608,9 +608,13 @@ void ipoib_ib_dev_flush(void *_dev)
 	if (test_bit(IPOIB_FLAG_ADMIN_UP, &priv->flags))
 		ipoib_ib_dev_up(dev);
 
+	down(&priv->vlan_mutex);
+
 	/* Flush any child interfaces too */
 	list_for_each_entry(cpriv, &priv->child_intfs, list)
 		ipoib_ib_dev_flush(&cpriv->dev);
+
+	up(&priv->vlan_mutex);
 }
 
 void ipoib_ib_dev_cleanup(struct net_device *dev)
---
0.99.9k
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