mlx4_en: Fix a kernel panic when waking tx queue

When the transmit queue gets full we enable interrupts for TX completions
There was a race that we handled the TX queue both from the interrupt context
and from the transmit function. Using "spin_trylock_irq()" ensures this
doesn't happen.

Signed-off-by: Yevgeny Petrilin <yevgenyp@mellanox.co.il>
Signed-off-by: David S. Miller <davem@davemloft.net>

diff --git a/drivers/net/mlx4/en_tx.c b/drivers/net/mlx4/en_tx.c
index ac6fc49..e5c98a9 100644 (file)
--- a/drivers/net/mlx4/en_tx.c
+++ b/drivers/net/mlx4/en_tx.c
@@ -426,7 +426,7 @@ void mlx4_en_poll_tx_cq(unsigned long data)
 
        INC_PERF_COUNTER(priv->pstats.tx_poll);
 
-       if (!spin_trylock(&ring->comp_lock)) {
+       if (!spin_trylock_irq(&ring->comp_lock)) {
                mod_timer(&cq->timer, jiffies + MLX4_EN_TX_POLL_TIMEOUT);
                return;
        }
@@ -439,7 +439,7 @@ void mlx4_en_poll_tx_cq(unsigned long data)
        if (inflight && priv->port_up)
                mod_timer(&cq->timer, jiffies + MLX4_EN_TX_POLL_TIMEOUT);
 
-       spin_unlock(&ring->comp_lock);
+       spin_unlock_irq(&ring->comp_lock);
 }
 
 static struct mlx4_en_tx_desc *mlx4_en_bounce_to_desc(struct mlx4_en_priv *priv,
@@ -482,9 +482,9 @@ static inline void mlx4_en_xmit_poll(struct mlx4_en_priv *priv, int tx_ind)
 
        /* Poll the CQ every mlx4_en_TX_MODER_POLL packets */
        if ((++ring->poll_cnt & (MLX4_EN_TX_POLL_MODER - 1)) == 0)
-               if (spin_trylock(&ring->comp_lock)) {
+               if (spin_trylock_irq(&ring->comp_lock)) {
                        mlx4_en_process_tx_cq(priv->dev, cq);
-                       spin_unlock(&ring->comp_lock);
+                       spin_unlock_irq(&ring->comp_lock);
                }
 }