igc: handle the IGC_PTP_ENABLED flag correctly

All functions in igc_ptp.c called from igc_main.c should check the
IGC_PTP_ENABLED flag. Adding check for this flag to stop and reset
functions.

Fixes: 5f29580 ("igc: Add basic skeleton for PTP")
Signed-off-by: Christopher S M Hall <[email protected]>
Reviewed-by: Corinna Vinschen <[email protected]>
Signed-off-by: Jacob Keller <[email protected]>
Tested-by: Mor Bar-Gabay <[email protected]>
Acked-by: Vinicius Costa Gomes <[email protected]>
Signed-off-by: Tony Nguyen <[email protected]>

Author: christopher-s-hall

drivers/net/ethernet/intel/igc/igc_ptp.c

@@ -1244,8 +1244,12 @@ void igc_ptp_suspend(struct igc_adapter *adapter)
  **/
 void igc_ptp_stop(struct igc_adapter *adapter)
 {
+	if (!(adapter->ptp_flags & IGC_PTP_ENABLED))
+		return;
+
 	igc_ptp_suspend(adapter);
 
+	adapter->ptp_flags &= ~IGC_PTP_ENABLED;
 	if (adapter->ptp_clock) {
 		ptp_clock_unregister(adapter->ptp_clock);
 		netdev_info(adapter->netdev, "PHC removed\n");
@@ -1266,6 +1270,9 @@ void igc_ptp_reset(struct igc_adapter *adapter)
 	unsigned long flags;
 	u32 timadj;
 
+	if (!(adapter->ptp_flags & IGC_PTP_ENABLED))
+		return;
+
 	/* reset the tstamp_config */
 	igc_ptp_set_timestamp_mode(adapter, &adapter->tstamp_config);