be2net: Bug fix to avoid disabling bottom half during firmware upgrade.

Certain firmware commands/operations to upgrade firmware could take several
seconds to complete. The code presently disables bottom half during these
operations which could lead to unpredictable behaviour in certain cases. This
patch now does all firmware upgrade operations asynchronously using a
completion variable.

Signed-off-by: Sarveshwar Bandi <sarveshwarb@serverengines.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

3 files changed, 20 insertions, 2 deletions

diff --git a/drivers/net/benet/be.h b/drivers/net/benet/be.h
index 373c1a563474..b46be490cd2a 100644
--- a/drivers/net/benet/be.h
+++ b/drivers/net/benet/be.h
@@ -283,6 +283,8 @@ struct be_adapter {
         u8 port_type;
         u8 transceiver;
         u8 generation;          /* BladeEngine ASIC generation */
+        u32 flash_status;
+        struct completion flash_compl;
 
         bool sriov_enabled;
         u32 vf_if_handle[BE_MAX_VF];
diff --git a/drivers/net/benet/be_cmds.c b/drivers/net/benet/be_cmds.c
index e79bf8b9af3b..c911bfb55b19 100644
--- a/drivers/net/benet/be_cmds.c
+++ b/drivers/net/benet/be_cmds.c
@@ -59,6 +59,13 @@ static int be_mcc_compl_process(struct be_adapter *adapter,
 
         compl_status = (compl->status >> CQE_STATUS_COMPL_SHIFT) &
                                 CQE_STATUS_COMPL_MASK;
+
+        if ((compl->tag0 == OPCODE_COMMON_WRITE_FLASHROM) &&
+                (compl->tag1 == CMD_SUBSYSTEM_COMMON)) {
+                adapter->flash_status = compl_status;
+                complete(&adapter->flash_compl);
+        }
+
         if (compl_status == MCC_STATUS_SUCCESS) {
                 if (compl->tag0 == OPCODE_ETH_GET_STATISTICS) {
                         struct be_cmd_resp_get_stats *resp =
@@ -1417,6 +1424,7 @@ int be_cmd_write_flashrom(struct be_adapter *adapter, struct be_dma_mem *cmd,
         int status;
 
         spin_lock_bh(&adapter->mcc_lock);
+        adapter->flash_status = 0;
 
         wrb = wrb_from_mccq(adapter);
         if (!wrb) {
@@ -1428,6 +1436,7 @@ int be_cmd_write_flashrom(struct be_adapter *adapter, struct be_dma_mem *cmd,
 
         be_wrb_hdr_prepare(wrb, cmd->size, false, 1,
                         OPCODE_COMMON_WRITE_FLASHROM);
+        wrb->tag1 = CMD_SUBSYSTEM_COMMON;
 
         be_cmd_hdr_prepare(&req->hdr, CMD_SUBSYSTEM_COMMON,
                 OPCODE_COMMON_WRITE_FLASHROM, cmd->size);
@@ -1439,10 +1448,16 @@ int be_cmd_write_flashrom(struct be_adapter *adapter, struct be_dma_mem *cmd,
         req->params.op_code = cpu_to_le32(flash_opcode);
         req->params.data_buf_size = cpu_to_le32(buf_size);
 
-        status = be_mcc_notify_wait(adapter);
+        be_mcc_notify(adapter);
+        spin_unlock_bh(&adapter->mcc_lock);
+
+        if (!wait_for_completion_timeout(&adapter->flash_compl,
+                        msecs_to_jiffies(12000)))
+                status = -1;
+        else
+                status = adapter->flash_status;
 
 err:
-        spin_unlock_bh(&adapter->mcc_lock);
         return status;
 }
 
diff --git a/drivers/net/benet/be_main.c b/drivers/net/benet/be_main.c
index 1c79c2009e40..aa065c71ddd8 100644
--- a/drivers/net/benet/be_main.c
+++ b/drivers/net/benet/be_main.c
@@ -2319,6 +2319,7 @@ static int be_ctrl_init(struct be_adapter *adapter)
         spin_lock_init(&adapter->mcc_lock);
         spin_lock_init(&adapter->mcc_cq_lock);
 
+        init_completion(&adapter->flash_compl);
         pci_save_state(adapter->pdev);
         return 0;