linux-kernel - [PATCH 3.16 057/294] IB/ipoib: Set IPOIB_NEIGH_TBL_FLUSH after flushed completion initialization

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Message-ID: <lsq.1510009382.182086240@decadent.org.uk>
Date:   Mon, 06 Nov 2017 23:03:02 +0000
From:   Ben Hutchings <ben@...adent.org.uk>
To:     linux-kernel@...r.kernel.org, stable@...r.kernel.org
CC:     akpm@...ux-foundation.org, "Feras Daoud" <ferasda@...lanox.com>,
        "Alex Vesker" <valex@...lanox.com>,
        "Leon Romanovsky" <leon@...nel.org>
Subject: [PATCH 3.16 057/294] IB/ipoib: Set IPOIB_NEIGH_TBL_FLUSH after
 flushed completion initialization

3.16.50-rc1 review patch.  If anyone has any objections, please let me know.

------------------

From: Feras Daoud <ferasda@...lanox.com>

commit d2e46fccc3e3d73a741efe433f00960331280696 upstream.

Set IPOIB_NEIGH_TBL_FLUSH bit after initializing the neighbor
flushed completion, otherwise the garbage collector may signal
a completion while it is not initialized yet.

Fixes: b63b70d87741 ("IPoIB: Use a private hash table for path lookup in xmit path")
Signed-off-by: Feras Daoud <ferasda@...lanox.com>
Signed-off-by: Alex Vesker <valex@...lanox.com>
Signed-off-by: Leon Romanovsky <leon@...nel.org>
Signed-off-by: Ben Hutchings <ben@...adent.org.uk>
---
 drivers/infiniband/ulp/ipoib/ipoib_main.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

--- a/drivers/infiniband/ulp/ipoib/ipoib_main.c
+++ b/drivers/infiniband/ulp/ipoib/ipoib_main.c
@@ -1235,6 +1235,7 @@ static void ipoib_flush_neighs(struct ip
 	int i, wait_flushed = 0;
 
 	init_completion(&priv->ntbl.flushed);
+	set_bit(IPOIB_NEIGH_TBL_FLUSH, &priv->flags);
 
 	spin_lock_irqsave(&priv->lock, flags);
 
@@ -1279,7 +1280,6 @@ static void ipoib_neigh_hash_uninit(stru
 
 	ipoib_dbg(priv, "ipoib_neigh_hash_uninit\n");
 	init_completion(&priv->ntbl.deleted);
-	set_bit(IPOIB_NEIGH_TBL_FLUSH, &priv->flags);
 
 	/* Stop GC if called at init fail need to cancel work */
 	stopped = test_and_set_bit(IPOIB_STOP_NEIGH_GC, &priv->flags);