netdev - [PATCH net] net/mlx4_en: Free netdev resources under state lock

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Message-Id: <1479824439-27353-1-git-send-email-tariqt@mellanox.com>
Date:   Tue, 22 Nov 2016 16:20:39 +0200
From:   Tariq Toukan <tariqt@...lanox.com>
To:     "David S. Miller" <davem@...emloft.net>
Cc:     netdev@...r.kernel.org, Eran Ben Elisha <eranbe@...lanox.com>,
        Saeed Mahameed <saeedm@...lanox.com>,
        Sagi Grimberg <sagi@...mberg.me>,
        Tariq Toukan <tariqt@...lanox.com>,
        Brenden Blanco <bblanco@...mgrid.com>
Subject: [PATCH net] net/mlx4_en: Free netdev resources under state lock

Make sure mlx4_en_free_resources is called under the netdev state lock.
This is needed since RCU dereference of XDP prog should be protected.

Fixes: 326fe02d1ed6 ("net/mlx4_en: protect ring->xdp_prog with rcu_read_lock")
Signed-off-by: Tariq Toukan <tariqt@...lanox.com>
Reported-by: Sagi Grimberg <sagi@...mberg.me>
CC: Brenden Blanco <bblanco@...mgrid.com>
---
 drivers/net/ethernet/mellanox/mlx4/en_netdev.c | 5 ++++-
 1 file changed, 4 insertions(+), 1 deletion(-)

diff --git a/drivers/net/ethernet/mellanox/mlx4/en_netdev.c b/drivers/net/ethernet/mellanox/mlx4/en_netdev.c
index 3a47e83d3e07..a60f635da78b 100644
--- a/drivers/net/ethernet/mellanox/mlx4/en_netdev.c
+++ b/drivers/net/ethernet/mellanox/mlx4/en_netdev.c
@@ -129,6 +129,9 @@ static enum mlx4_net_trans_rule_id mlx4_ip_proto_to_trans_rule_id(u8 ip_proto)
 	}
 };
 
+/* Must not acquire state_lock, as its corresponding work_sync
+ * is done under it.
+ */
 static void mlx4_en_filter_work(struct work_struct *work)
 {
 	struct mlx4_en_filter *filter = container_of(work,
@@ -2189,13 +2192,13 @@ void mlx4_en_destroy_netdev(struct net_device *dev)
 	mutex_lock(&mdev->state_lock);
 	mdev->pndev[priv->port] = NULL;
 	mdev->upper[priv->port] = NULL;
-	mutex_unlock(&mdev->state_lock);
 
 #ifdef CONFIG_RFS_ACCEL
 	mlx4_en_cleanup_filters(priv);
 #endif
 
 	mlx4_en_free_resources(priv);
+	mutex_unlock(&mdev->state_lock);
 
 	kfree(priv->tx_ring);
 	kfree(priv->tx_cq);
-- 
1.8.3.1