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Date: Wed, 23 Nov 2016 09:46:52 -0800 From: Eric Dumazet <eric.dumazet@...il.com> To: David Miller <davem@...emloft.net> Cc: netdev <netdev@...r.kernel.org>, Tariq Toukan <tariqt@...lanox.com> Subject: [PATCH net-next] mlx4: do not use priv->stats_lock in mlx4_en_auto_moderation() From: Eric Dumazet <edumazet@...gle.com> Per RX ring packets/bytes counters are not protected by global priv->stats_lock. Better not confuse the reader, and use READ_ONCE() to show we read these counters without surrounding synchronization. Interrupt moderation is best effort, and we do not really care of ultra precise counters. Signed-off-by: Eric Dumazet <edumazet@...gle.com> --- drivers/net/ethernet/mellanox/mlx4/en_netdev.c | 6 ++---- 1 file changed, 2 insertions(+), 4 deletions(-) diff --git a/drivers/net/ethernet/mellanox/mlx4/en_netdev.c b/drivers/net/ethernet/mellanox/mlx4/en_netdev.c index 9a807e93c9fdd81e61e561208aa1480a244d0bdb..b964bdcd4ae509a7e693215e8b32f040218e252c 100644 --- a/drivers/net/ethernet/mellanox/mlx4/en_netdev.c +++ b/drivers/net/ethernet/mellanox/mlx4/en_netdev.c @@ -1391,10 +1391,8 @@ static void mlx4_en_auto_moderation(struct mlx4_en_priv *priv) return; for (ring = 0; ring < priv->rx_ring_num; ring++) { - spin_lock_bh(&priv->stats_lock); - rx_packets = priv->rx_ring[ring]->packets; - rx_bytes = priv->rx_ring[ring]->bytes; - spin_unlock_bh(&priv->stats_lock); + rx_packets = READ_ONCE(priv->rx_ring[ring]->packets); + rx_bytes = READ_ONCE(priv->rx_ring[ring]->bytes); rx_pkt_diff = ((unsigned long) (rx_packets - priv->last_moder_packets[ring]));
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