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>

1 files changed, 2 insertions, 0 deletions

diff --git a/drivers/net/qlcnic/qlcnic_init.c b/drivers/net/qlcnic/qlcnic_init.c
index 2bd00d54dd3f..058ce61501c3 100644
--- a/drivers/net/qlcnic/qlcnic_init.c
+++ b/drivers/net/qlcnic/qlcnic_init.c
@@ -181,7 +181,9 @@ skip_rds:
 
         tx_ring = adapter->tx_ring;
         vfree(tx_ring->cmd_buf_arr);
+        tx_ring->cmd_buf_arr = NULL;
         kfree(adapter->tx_ring);
+        adapter->tx_ring = NULL;
 }
 
 int qlcnic_alloc_sw_resources(struct qlcnic_adapter *adapter)