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netxen: fix race in tx ring acccess

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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>
This commit is contained in:
Dhananjay Phadke
2009-05-05 19:05:06 +00:00
committed by David S. Miller
parent 78a658d972
commit 22527864ed
3 changed files with 8 additions and 7 deletions
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4
drivers/net/netxen/netxen_nic_hw.c
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@@ -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) {