be2net: fix to avoid sending get_stats request if one is already being processed.

GET_STATS request uses the same memory region as the response.
If a new request for get stats is fired before the response for
the previous get_stats request is received, the response will
corrupt the new request, causing the f/w to misbehave.

Signed-off-by: Somnath K <somnathk@serverengines.com>
Signed-off-by: Ajit Khaparde <ajitk@serverengines.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

3 files changed, 5 insertions, 1 deletions

diff --git a/drivers/net/benet/be.h b/drivers/net/benet/be.h
index 5e6f581c49d4..99197bd54da5 100644
--- a/drivers/net/benet/be.h
+++ b/drivers/net/benet/be.h
@@ -289,6 +289,7 @@ struct be_adapter {
         u32 rx_fc;              /* Rx flow control */
         u32 tx_fc;              /* Tx flow control */
         bool ue_detected;
+        bool stats_ioctl_sent;
         int link_speed;
         u8 port_type;
         u8 transceiver;
diff --git a/drivers/net/benet/be_cmds.c b/drivers/net/benet/be_cmds.c
index 7fd860dcbc80..3d305494a606 100644
--- a/drivers/net/benet/be_cmds.c
+++ b/drivers/net/benet/be_cmds.c
@@ -75,6 +75,7 @@ static int be_mcc_compl_process(struct be_adapter *adapter,
                         be_dws_le_to_cpu(&resp->hw_stats,
                                                 sizeof(resp->hw_stats));
                         netdev_stats_update(adapter);
+                        adapter->stats_ioctl_sent = false;
                 }
         } else if ((compl_status != MCC_STATUS_NOT_SUPPORTED) &&
                    (compl->tag0 != OPCODE_COMMON_NTWK_MAC_QUERY)) {
@@ -951,6 +952,7 @@ int be_cmd_get_stats(struct be_adapter *adapter, struct be_dma_mem *nonemb_cmd)
         sge->len = cpu_to_le32(nonemb_cmd->size);
 
         be_mcc_notify(adapter);
+        adapter->stats_ioctl_sent = true;
 
 err:
         spin_unlock_bh(&adapter->mcc_lock);
diff --git a/drivers/net/benet/be_main.c b/drivers/net/benet/be_main.c
index e4a8ae3a1c8d..74e146f470c6 100644
--- a/drivers/net/benet/be_main.c
+++ b/drivers/net/benet/be_main.c
@@ -1801,7 +1801,8 @@ static void be_worker(struct work_struct *work)
         struct be_adapter *adapter =
                 container_of(work, struct be_adapter, work.work);
 
-        be_cmd_get_stats(adapter, &adapter->stats.cmd);
+        if (!adapter->stats_ioctl_sent)
+                be_cmd_get_stats(adapter, &adapter->stats.cmd);
 
         /* Set EQ delay */
         be_rx_eqd_update(adapter);