net/mlx4_en: Remove BUG_ON assert when checking if ring is full
authorIdo Shamay <idos@mellanox.com>
Wed, 22 Jul 2015 13:53:49 +0000 (16:53 +0300)
committerDavid S. Miller <davem@davemloft.net>
Sun, 26 Jul 2015 23:29:26 +0000 (16:29 -0700)
In mlx4_en_is_ring_empty we check if ring surpassed its size.
Since the prod and cons indicators are u32, there might be a state where
prod wrapped around and cons, making this assert false, although no
actual bug exists (other code segment can cope with this state).

Signed-off-by: Ido Shamay <idos@mellanox.com>
Signed-off-by: Eugenia Emantayev <eugenia@mellanox.com>
Signed-off-by: Or Gerlitz <ogerlitz@mellanox.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
drivers/net/ethernet/mellanox/mlx4/en_rx.c

index 7a4f20bb7fcb4c2640ad8111f5a98ff95088075c..9c145dddd7175fffda22c71a8f31d4d27d807ceb 100644 (file)
@@ -246,7 +246,6 @@ static int mlx4_en_prepare_rx_desc(struct mlx4_en_priv *priv,
 
 static inline bool mlx4_en_is_ring_empty(struct mlx4_en_rx_ring *ring)
 {
-       BUG_ON((u32)(ring->prod - ring->cons) > ring->actual_size);
        return ring->prod == ring->cons;
 }