i40e: make PF wait reset loop reliable

Use jiffies to limit max waiting time for PF reset to succeed.
Previous wait loop was unreliable. It required unreasonably long time
to wait for PF reset after reboot when NIC was about to enter
recovery mode

Reviewed-by: Aleksandr Loktionov <aleksandr.loktionov@intel.com>
Signed-off-by: Piotr Kwapulinski <piotr.kwapulinski@intel.com>
Tested-by: Andrew Bowers <andrewx.bowers@intel.com>
Signed-off-by: Jeff Kirsher <jeffrey.t.kirsher@intel.com>

diff --git a/drivers/net/ethernet/intel/i40e/i40e_main.c b/drivers/net/ethernet/intel/i40e/i40e_main.c
index 5f7f514..3978b66 100644 (file)
--- a/drivers/net/ethernet/intel/i40e/i40e_main.c
+++ b/drivers/net/ethernet/intel/i40e/i40e_main.c
@@ -14606,25 +14606,23 @@ static bool i40e_check_recovery_mode(struct i40e_pf *pf)
  **/
 static i40e_status i40e_pf_loop_reset(struct i40e_pf *pf)
 {
-       const unsigned short MAX_CNT = 1000;
-       const unsigned short MSECS = 10;
+       /* wait max 10 seconds for PF reset to succeed */
+       const unsigned long time_end = jiffies + 10 * HZ;
+
        struct i40e_hw *hw = &pf->hw;
        i40e_status ret;
-       int cnt;
 
-       for (cnt = 0; cnt < MAX_CNT; ++cnt) {
+       ret = i40e_pf_reset(hw);
+       while (ret != I40E_SUCCESS && time_before(jiffies, time_end)) {
+               usleep_range(10000, 20000);
                ret = i40e_pf_reset(hw);
-               if (!ret)
-                       break;
-               msleep(MSECS);
        }
 
-       if (cnt == MAX_CNT) {
+       if (ret == I40E_SUCCESS)
+               pf->pfr_count++;
+       else
                dev_info(&pf->pdev->dev, "PF reset failed: %d\n", ret);
-               return ret;
-       }
 
-       pf->pfr_count++;
        return ret;
 }