[PATCH 1/2][SRU Xenial] igb: implement igb_ptp_suspend

[AceLan Kao]

From: Jacob Keller <jacob.e.keller at intel.com>

BugLink: http://bugs.launchpad.net/bugs/1662763

Make igb_ptp_stop take advantage of this new function to reduce code
duplication.

Signed-off-by: Jacob Keller <jacob.e.keller at intel.com>
Tested-by: Aaron Brown <aaron.f.brown at intel.com>
Signed-off-by: Jeff Kirsher <jeffrey.t.kirsher at intel.com>
(cherry picked from commit e3f2350de829eb0c3349f416feed81c0a3ac0732)
Signed-off-by: AceLan Kao <acelan.kao at canonical.com>
---
 drivers/net/ethernet/intel/igb/igb.h     |  1 +
 drivers/net/ethernet/intel/igb/igb_ptp.c | 22 +++++++++++++++++-----
 2 files changed, 18 insertions(+), 5 deletions(-)

diff --git a/drivers/net/ethernet/intel/igb/igb.h b/drivers/net/ethernet/intel/igb/igb.h
index 707ae5c..5077c4d 100644
--- a/drivers/net/ethernet/intel/igb/igb.h
+++ b/drivers/net/ethernet/intel/igb/igb.h
@@ -536,6 +536,7 @@ void igb_set_fw_version(struct igb_adapter *);
 void igb_ptp_init(struct igb_adapter *adapter);
 void igb_ptp_stop(struct igb_adapter *adapter);
 void igb_ptp_reset(struct igb_adapter *adapter);
+void igb_ptp_suspend(struct igb_adapter *adapter);
 void igb_ptp_rx_hang(struct igb_adapter *adapter);
 void igb_ptp_rx_rgtstamp(struct igb_q_vector *q_vector, struct sk_buff *skb);
 void igb_ptp_rx_pktstamp(struct igb_q_vector *q_vector, unsigned char *va,
diff --git a/drivers/net/ethernet/intel/igb/igb_ptp.c b/drivers/net/ethernet/intel/igb/igb_ptp.c
index c44df87..5314f9f 100644
--- a/drivers/net/ethernet/intel/igb/igb_ptp.c
+++ b/drivers/net/ethernet/intel/igb/igb_ptp.c
@@ -1124,12 +1124,13 @@ void igb_ptp_init(struct igb_adapter *adapter)
 }
 
 /**
- * igb_ptp_stop - Disable PTP device and stop the overflow check.
- * @adapter: Board private structure.
+ * igb_ptp_suspend - Disable PTP work items and prepare for suspend
+ * @adapter: Board private structure
  *
- * This function stops the PTP support and cancels the delayed work.
- **/
-void igb_ptp_stop(struct igb_adapter *adapter)
+ * This function stops the overflow check work and PTP Tx timestamp work, and
+ * will prepare the device for OS suspend.
+ */
+void igb_ptp_suspend(struct igb_adapter *adapter)
 {
 	switch (adapter->hw.mac.type) {
 	case e1000_82576:
@@ -1152,6 +1153,17 @@ void igb_ptp_stop(struct igb_adapter *adapter)
 		adapter->ptp_tx_skb = NULL;
 		clear_bit_unlock(__IGB_PTP_TX_IN_PROGRESS, &adapter->state);
 	}
+}
+
+/**
+ * igb_ptp_stop - Disable PTP device and stop the overflow check.
+ * @adapter: Board private structure.
+ *
+ * This function stops the PTP support and cancels the delayed work.
+ **/
+void igb_ptp_stop(struct igb_adapter *adapter)
+{
+	igb_ptp_suspend(adapter);
 
 	if (adapter->ptp_clock) {
 		ptp_clock_unregister(adapter->ptp_clock);
-- 
2.7.4