diff options
| author | Rajesh K Borundia <rajesh.borundia@qlogic.com> | 2010-06-17 06:56:41 +0400 |
|---|---|---|
| committer | David S. Miller <davem@davemloft.net> | 2010-06-17 19:57:56 +0400 |
| commit | ef71ff833acfd3795c3af1bb800ac186561508ef (patch) | |
| tree | fa285765677574d4aafb42c9fbbc32443a8e4597 /drivers/net/qlcnic/qlcnic_hw.c | |
| parent | 8f891387aa73b85d2ea8d953e04dac224f687e52 (diff) | |
| download | linux-ef71ff833acfd3795c3af1bb800ac186561508ef.tar.xz | |
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_hw.c')
| -rw-r--r-- | drivers/net/qlcnic/qlcnic_hw.c | 12 |
1 files changed, 9 insertions, 3 deletions
diff --git a/drivers/net/qlcnic/qlcnic_hw.c b/drivers/net/qlcnic/qlcnic_hw.c index f776956d2d6c..d9becb96d403 100644 --- a/drivers/net/qlcnic/qlcnic_hw.c +++ b/drivers/net/qlcnic/qlcnic_hw.c @@ -338,9 +338,15 @@ qlcnic_send_cmd_descs(struct qlcnic_adapter *adapter, if (nr_desc >= qlcnic_tx_avail(tx_ring)) { netif_tx_stop_queue(tx_ring->txq); - __netif_tx_unlock_bh(tx_ring->txq); - adapter->stats.xmit_off++; - return -EBUSY; + smp_mb(); + if (qlcnic_tx_avail(tx_ring) > nr_desc) { + if (qlcnic_tx_avail(tx_ring) > TX_STOP_THRESH) + netif_tx_wake_queue(tx_ring->txq); + } else { + adapter->stats.xmit_off++; + __netif_tx_unlock_bh(tx_ring->txq); + return -EBUSY; + } } do { |