diff options
| author | Dhananjay Phadke <dhananjay@netxen.com> | 2009-05-05 19:05:06 +0000 |
|---|---|---|
| committer | David S. Miller <davem@davemloft.net> | 2009-05-06 15:33:35 -0700 |
| commit | 22527864ed7ee6c50f3c4d4b03c83c963caf5c0b (patch) | |
| tree | 074c3dce3fe61b54aec6c7d8a829c4fa7592a6c0 /drivers/net/netxen | |
| parent | 78a658d9720ce1b3dd71af3ee6d207ca751a48f5 (diff) | |
| download | blackbird-op-linux-22527864ed7ee6c50f3c4d4b03c83c963caf5c0b.tar.gz blackbird-op-linux-22527864ed7ee6c50f3c4d4b03c83c963caf5c0b.zip | |
netxen: fix race in tx ring acccess
Fix the distance check between tx ring producer and consumer that
could lead to tx ring wrap around.
Signed-off-by: Dhananjay Phadke <dhananjay@netxen.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'drivers/net/netxen')
| -rw-r--r-- | drivers/net/netxen/netxen_nic_hw.c | 4 | ||||
| -rw-r--r-- | drivers/net/netxen/netxen_nic_init.c | 8 | ||||
| -rw-r--r-- | drivers/net/netxen/netxen_nic_main.c | 3 |
3 files changed, 8 insertions, 7 deletions
diff --git a/drivers/net/netxen/netxen_nic_hw.c b/drivers/net/netxen/netxen_nic_hw.c index 9f5ced3eaf9d..23c974a7e0e4 100644 --- a/drivers/net/netxen/netxen_nic_hw.c +++ b/drivers/net/netxen/netxen_nic_hw.c @@ -526,7 +526,7 @@ netxen_send_cmd_descs(struct netxen_adapter *adapter, producer = tx_ring->producer; consumer = tx_ring->sw_consumer; - if (nr_desc > find_diff_among(producer, consumer, tx_ring->num_desc)) { + if (nr_desc >= find_diff_among(producer, consumer, tx_ring->num_desc)) { netif_tx_unlock_bh(adapter->netdev); return -EBUSY; } @@ -752,7 +752,7 @@ int netxen_linkevent_request(struct netxen_adapter *adapter, int enable) word = NX_NIC_H2C_OPCODE_GET_LINKEVENT | ((u64)adapter->portnum << 16); req.req_hdr = cpu_to_le64(word); - req.words[0] = cpu_to_le64(enable); + req.words[0] = cpu_to_le64(enable | (enable << 8)); rv = netxen_send_cmd_descs(adapter, (struct cmd_desc_type0 *)&req, 1); if (rv != 0) { diff --git a/drivers/net/netxen/netxen_nic_init.c b/drivers/net/netxen/netxen_nic_init.c index d18216779a09..de9ebbd841b7 100644 --- a/drivers/net/netxen/netxen_nic_init.c +++ b/drivers/net/netxen/netxen_nic_init.c @@ -1319,10 +1319,11 @@ int netxen_process_cmd_ring(struct netxen_adapter *adapter) break; } - if (count) { - tx_ring->sw_consumer = sw_consumer; + tx_ring->sw_consumer = sw_consumer; + + if (count && netif_running(netdev)) { smp_mb(); - if (netif_queue_stopped(netdev) && netif_running(netdev)) { + if (netif_queue_stopped(netdev) && netif_carrier_ok(netdev)) { netif_tx_lock(netdev); netif_wake_queue(netdev); smp_mb(); @@ -1450,7 +1451,6 @@ netxen_post_rx_buffers_nodb(struct netxen_adapter *adapter, rds_ring->producer = producer; NXWR32(adapter, rds_ring->crb_rcv_producer, (producer - 1) & (rds_ring->num_desc - 1)); - wmb(); } spin_unlock(&rds_ring->lock); } diff --git a/drivers/net/netxen/netxen_nic_main.c b/drivers/net/netxen/netxen_nic_main.c index 5d79c19a6ec0..6a496b1909eb 100644 --- a/drivers/net/netxen/netxen_nic_main.c +++ b/drivers/net/netxen/netxen_nic_main.c @@ -809,6 +809,7 @@ netxen_nic_down(struct netxen_adapter *adapter, struct net_device *netdev) { netif_carrier_off(netdev); netif_stop_queue(netdev); + smp_mb(); netxen_napi_disable(adapter); if (adapter->stop_port) @@ -1340,7 +1341,7 @@ netxen_nic_xmit_frame(struct sk_buff *skb, struct net_device *netdev) producer = tx_ring->producer; smp_mb(); consumer = tx_ring->sw_consumer; - if ((no_of_desc+2) > find_diff_among(producer, consumer, num_txd)) { + if ((no_of_desc+2) >= find_diff_among(producer, consumer, num_txd)) { netif_stop_queue(netdev); smp_mb(); return NETDEV_TX_BUSY; |
