IB/ipoib: Fix for potential no-carrier state

From: Alex Estrin <[email protected]>

On reboot SM can program port pkey table before ipoib registered its event handler, which could result in missing pkey event and leave root interface with initial pkey value from index 0.

Since OPA port starts with invalid pkey in index 0, root interface will fail to initialize and stay down with no-carrier flag.

For IB ipoib interface may end up with pkey different from value opensm put in pkey table idx 0, resulting in connectivity issues (different mcast groups, for example).

Close the window by calling event handler after registration to make sure ipoib pkey is in sync with port pkey table.

---
 drivers/infiniband/ulp/ipoib/ipoib_main.c |    3 +++
 1 files changed, 3 insertions(+), 0 deletions(-)

index 5930c7d..161ba8c 100644
@@ -2306,6 +2306,9 @@ void ipoib_set_dev_features(struct ipoib_dev_priv *priv, struct ib_device *hca)
 			      priv->ca, ipoib_event);
 	ib_register_event_handler(&priv->event_handler);
 
+	/* call event handler to ensure pkey in sync */
+	queue_work(ipoib_workqueue, &priv->flush_heavy);
+
 	result = register_netdev(priv->dev);
 	if (result) {
 		pr_warn("%s: couldn't register ipoib port %d; error %d\n",

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Seemed liked Doug was Ok with the explanation, so applied to for-next

Jason
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