netdev - [PATCH] mlx4: decreasing ref count when removing mac

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Message-ID: <4E3A7CE8.4080407@mellanox.co.il>
Date:	Thu, 4 Aug 2011 14:05:12 +0300
From:	Yevgeny Petrilin <yevgenyp@...lanox.co.il>
To:	<roland@...nel.org>
CC:	<davem@...emloft.net>, <linux-rdma@...r.kernel.org>,
	<netdev@...r.kernel.org>, <yevgenyp@...lanox.co.il>
Subject: [PATCH] mlx4: decreasing ref count when removing mac


For older FW versions, when a Mac address removed from Mac table,
we should set 0 for reference count for the corresponding Mac index.
Fixes a bug where removing Mac from the table still left that entry as
invalid.

Signed-off-by: Yevgeny Petrilin <yevgenyp@...lanox.co.il>
---
 drivers/net/mlx4/port.c |    9 ++++++---
 1 files changed, 6 insertions(+), 3 deletions(-)

diff --git a/drivers/net/mlx4/port.c b/drivers/net/mlx4/port.c
index 1f95afd..609e0ec 100644
--- a/drivers/net/mlx4/port.c
+++ b/drivers/net/mlx4/port.c
@@ -258,9 +258,12 @@ void mlx4_unregister_mac(struct mlx4_dev *dev, u8 port, int qpn)
 	if (validate_index(dev, table, index))
 		goto out;
 
-	table->entries[index] = 0;
-	mlx4_set_port_mac_table(dev, port, table->entries);
-	--table->total;
+	/* Check whether this address has reference count */
+	if (!(--table->refs[index])) {
+		table->entries[index] = 0;
+		mlx4_set_port_mac_table(dev, port, table->entries);
+		--table->total;
+	}
 out:
 	mutex_unlock(&table->mutex);
 }
-- 
1.6.0.2

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