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net/mlx4_en: Fix panic on xmit while port is down

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When port is down, tx drop counter update is not needed.
Updating the counter in this case can cause a kernel
panic as when the port is down, ring can be NULL.

Fixes: 63a664b7e9 ("net/mlx4_en: fix tx_dropped bug")
Signed-off-by: Moshe Shemesh <moshe@mellanox.com>
Signed-off-by: Tariq Toukan <tariqt@mellanox.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Moshe Shemesh 2016-09-11 10:56:20 +03:00 committed by David S. Miller
parent 564ed9b187
commit 7a61fc86af
1 changed files with 7 additions and 5 deletions
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12
drivers/net/ethernet/mellanox/mlx4/en_tx.c
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@ -818,7 +818,7 @@ netdev_tx_t mlx4_en_xmit(struct sk_buff *skb, struct net_device *dev)
real_size = get_real_size(skb, shinfo, dev, &lso_header_size,
&inline_ok, &fragptr);
if (unlikely(!real_size))
goto tx_drop;
goto tx_drop_count;
/* Align descriptor to TXBB size */
desc_size = ALIGN(real_size, TXBB_SIZE);
@ -826,7 +826,7 @@ netdev_tx_t mlx4_en_xmit(struct sk_buff *skb, struct net_device *dev)
if (unlikely(nr_txbb > MAX_DESC_TXBBS)) {
if (netif_msg_tx_err(priv))
en_warn(priv, "Oversized header or SG list\n");
goto tx_drop;
goto tx_drop_count;
}
bf_ok = ring->bf_enabled;
@ -1071,9 +1071,10 @@ netdev_tx_t mlx4_en_xmit(struct sk_buff *skb, struct net_device *dev)
PCI_DMA_TODEVICE);
}
tx_drop_count:
ring->tx_dropped++;
tx_drop:
dev_kfree_skb_any(skb);
ring->tx_dropped++;
return NETDEV_TX_OK;
}
@ -1106,7 +1107,7 @@ netdev_tx_t mlx4_en_xmit_frame(struct mlx4_en_rx_alloc *frame,
goto tx_drop;
if (mlx4_en_is_tx_ring_full(ring))
goto tx_drop;
goto tx_drop_count;
/* fetch ring->cons far ahead before needing it to avoid stall */
ring_cons = READ_ONCE(ring->cons);
@ -1176,7 +1177,8 @@ netdev_tx_t mlx4_en_xmit_frame(struct mlx4_en_rx_alloc *frame,
return NETDEV_TX_OK;
tx_drop:
tx_drop_count:
ring->tx_dropped++;
tx_drop:
return NETDEV_TX_BUSY;
}