[net-next 04/14] i40e: Handle admin Q timeout when releasing NVM

[Jeff Kirsher]

From: Paul M Stillwell Jr <paul.m.stillwell...@intel.com>

There are some rare cases where the release resource call will return an
admin Q timeout. In these cases the code needs to try to release the
resource again until it succeeds or it times out.

Signed-off-by: Paul M Stillwell Jr <paul.m.stillwell...@intel.com>
Tested-by: Andrew Bowers <andrewx.bow...@intel.com>
Signed-off-by: Jeff Kirsher <jeffrey.t.kirs...@intel.com>
---
 drivers/net/ethernet/intel/i40e/i40e_nvm.c | 21 +++++++++++++++++++--
 1 file changed, 19 insertions(+), 2 deletions(-)

diff --git a/drivers/net/ethernet/intel/i40e/i40e_nvm.c 
b/drivers/net/ethernet/intel/i40e/i40e_nvm.c
index 800bd55d0159..17607a2c0a65 100644
--- a/drivers/net/ethernet/intel/i40e/i40e_nvm.c
+++ b/drivers/net/ethernet/intel/i40e/i40e_nvm.c
@@ -134,8 +134,25 @@ i40e_status i40e_acquire_nvm(struct i40e_hw *hw,
  **/
 void i40e_release_nvm(struct i40e_hw *hw)
 {
-       if (!hw->nvm.blank_nvm_mode)
-               i40e_aq_release_resource(hw, I40E_NVM_RESOURCE_ID, 0, NULL);
+       i40e_status ret_code = I40E_SUCCESS;
+       u32 total_delay = 0;
+
+       if (hw->nvm.blank_nvm_mode)
+               return;
+
+       ret_code = i40e_aq_release_resource(hw, I40E_NVM_RESOURCE_ID, 0, NULL);
+
+       /* there are some rare cases when trying to release the resource
+        * results in an admin Q timeout, so handle them correctly
+        */
+       while ((ret_code == I40E_ERR_ADMIN_QUEUE_TIMEOUT) &&
+              (total_delay < hw->aq.asq_cmd_timeout)) {
+               usleep_range(1000, 2000);
+               ret_code = i40e_aq_release_resource(hw,
+                                                   I40E_NVM_RESOURCE_ID,
+                                                   0, NULL);
+               total_delay++;
+       }
 }
 
 /**
-- 
2.13.3