diff options
| author | Rajesh K Borundia <rajesh.borundia@qlogic.com> | 2010-06-17 02:56:41 +0000 |
|---|---|---|
| committer | David S. Miller <davem@davemloft.net> | 2010-06-17 08:57:56 -0700 |
| commit | ef71ff833acfd3795c3af1bb800ac186561508ef (patch) | |
| tree | fa285765677574d4aafb42c9fbbc32443a8e4597 /drivers/net/qlcnic/qlcnic_main.c | |
| parent | 8f891387aa73b85d2ea8d953e04dac224f687e52 (diff) | |
| download | linux-rt-ef71ff833acfd3795c3af1bb800ac186561508ef.tar.gz | |
qlcnic: fix race in tx stop queue
There is a race between netif_stop_queue and netif_stopped_queue
check. So check once again if buffers are available to avoid race.
With above logic we can also get rid of tx lock in process_cmd_ring.
Signed-off-by: Rajesh K Borundia <rajesh.borundia@qlogic.com>
Signed-off-by: Amit Kumar Salecha <amit.salecha@qlogic.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'drivers/net/qlcnic/qlcnic_main.c')
| -rw-r--r-- | drivers/net/qlcnic/qlcnic_main.c | 23 |
1 files changed, 10 insertions, 13 deletions
diff --git a/drivers/net/qlcnic/qlcnic_main.c b/drivers/net/qlcnic/qlcnic_main.c index 06d2dfd646fe..655bccd7f8f4 100644 --- a/drivers/net/qlcnic/qlcnic_main.c +++ b/drivers/net/qlcnic/qlcnic_main.c @@ -132,12 +132,6 @@ qlcnic_update_cmd_producer(struct qlcnic_adapter *adapter, struct qlcnic_host_tx_ring *tx_ring) { writel(tx_ring->producer, tx_ring->crb_cmd_producer); - - if (qlcnic_tx_avail(tx_ring) <= TX_STOP_THRESH) { - netif_stop_queue(adapter->netdev); - smp_mb(); - adapter->stats.xmit_off++; - } } static const u32 msi_tgt_status[8] = { @@ -1137,7 +1131,7 @@ qlcnic_setup_netdev(struct qlcnic_adapter *adapter, adapter->max_mc_count = 38; netdev->netdev_ops = &qlcnic_netdev_ops; - netdev->watchdog_timeo = 2*HZ; + netdev->watchdog_timeo = 5*HZ; qlcnic_change_mtu(netdev, netdev->mtu); @@ -1709,10 +1703,15 @@ qlcnic_xmit_frame(struct sk_buff *skb, struct net_device *netdev) /* 4 fragments per cmd des */ no_of_desc = (frag_count + 3) >> 2; - if (unlikely(no_of_desc + 2 > qlcnic_tx_avail(tx_ring))) { + if (unlikely(qlcnic_tx_avail(tx_ring) <= TX_STOP_THRESH)) { netif_stop_queue(netdev); - adapter->stats.xmit_off++; - return NETDEV_TX_BUSY; + smp_mb(); + if (qlcnic_tx_avail(tx_ring) > TX_STOP_THRESH) + netif_start_queue(netdev); + else { + adapter->stats.xmit_off++; + return NETDEV_TX_BUSY; + } } producer = tx_ring->producer; @@ -2018,14 +2017,12 @@ static int qlcnic_process_cmd_ring(struct qlcnic_adapter *adapter) smp_mb(); if (netif_queue_stopped(netdev) && netif_carrier_ok(netdev)) { - __netif_tx_lock(tx_ring->txq, smp_processor_id()); if (qlcnic_tx_avail(tx_ring) > TX_STOP_THRESH) { netif_wake_queue(netdev); - adapter->tx_timeo_cnt = 0; adapter->stats.xmit_on++; } - __netif_tx_unlock(tx_ring->txq); } + adapter->tx_timeo_cnt = 0; } /* * If everything is freed up to consumer then check if the ring is full |