i40e/i40evf: Update check for AQ aliveness

Update the i40e_check_asq_alive check to ensure that the len register
offset is non-zero, indicating that SW has initialized the AQ.

Change-ID: I9c2e804788b4775bef9c7e80954ab004e6bdb306
Signed-off-by: Kevin Scott <kevin.c.scott@intel.com>
Tested-by: Kavindya Deegala <kavindya.s.deegala@intel.com>
Signed-off-by: Jeff Kirsher <jeffrey.t.kirsher@intel.com>

drivers/net/ethernet/intel/i40e/i40e_common.c

@@ -133,7 +133,11 @@ void i40e_debug_aq(struct i40e_hw *hw, enum i40e_debug_mask mask, void *desc,
  **/
 bool i40e_check_asq_alive(struct i40e_hw *hw)
 {
-	return !!(rd32(hw, hw->aq.asq.len) & I40E_PF_ATQLEN_ATQENABLE_MASK);
+	if (hw->aq.asq.len)
+		return !!(rd32(hw, hw->aq.asq.len) &
+			  I40E_PF_ATQLEN_ATQENABLE_MASK);
+	else
+		return false;
 }
 
 /**

drivers/net/ethernet/intel/i40evf/i40e_common.c

@@ -133,7 +133,11 @@ void i40evf_debug_aq(struct i40e_hw *hw, enum i40e_debug_mask mask, void *desc,
  **/
 bool i40evf_check_asq_alive(struct i40e_hw *hw)
 {
-	return !!(rd32(hw, hw->aq.asq.len) & I40E_PF_ATQLEN_ATQENABLE_MASK);
+	if (hw->aq.asq.len)
+		return !!(rd32(hw, hw->aq.asq.len) &
+			  I40E_PF_ATQLEN_ATQENABLE_MASK);
+	else
+		return false;
 }
 
 /**