i40e: use pf data structure directly in i40e_ptp_rx_hang

There's no reason to pass a *vsi pointer if we already have the *pf
pointer in the only location where we call this function. Lets update
the signature and directly pass the *pf data structure pointer.
Signed-off-by: NJacob Keller <jacob.e.keller@intel.com>
Signed-off-by: NJeff Kirsher <jeffrey.t.kirsher@intel.com>

drivers/net/ethernet/intel/i40e/i40e.h

@@ -956,7 +956,7 @@ bool i40e_dcb_need_reconfig(struct i40e_pf *pf,
 			    struct i40e_dcbx_config *old_cfg,
 			    struct i40e_dcbx_config *new_cfg);
 #endif /* CONFIG_I40E_DCB */
-void i40e_ptp_rx_hang(struct i40e_vsi *vsi);
+void i40e_ptp_rx_hang(struct i40e_pf *pf);
 void i40e_ptp_tx_hwtstamp(struct i40e_pf *pf);
 void i40e_ptp_rx_hwtstamp(struct i40e_pf *pf, struct sk_buff *skb, u8 index);
 void i40e_ptp_set_increment(struct i40e_pf *pf);

drivers/net/ethernet/intel/i40e/i40e_main.c

@@ -6372,7 +6372,7 @@ static void i40e_watchdog_subtask(struct i40e_pf *pf)
 				i40e_update_veb_stats(pf->veb[i]);
 	}
 
-	i40e_ptp_rx_hang(pf->vsi[pf->lan_vsi]);
+	i40e_ptp_rx_hang(pf);
 }
 
 /**

drivers/net/ethernet/intel/i40e/i40e_ptp.c

@@ -269,6 +269,7 @@ static u32 i40e_ptp_get_rx_events(struct i40e_pf *pf)
 
 /**
  * i40e_ptp_rx_hang - Detect error case when Rx timestamp registers are hung
+ * @pf: The PF private data structure
  * @vsi: The VSI with the rings relevant to 1588
  *
  * This watchdog task is scheduled to detect error case where hardware has
@@ -276,9 +277,8 @@ static u32 i40e_ptp_get_rx_events(struct i40e_pf *pf)
  * particular error is rare but leaves the device in a state unable to timestamp
  * any future packets.
  **/
-void i40e_ptp_rx_hang(struct i40e_vsi *vsi)
+void i40e_ptp_rx_hang(struct i40e_pf *pf)
 {
-	struct i40e_pf *pf = vsi->back;
 	struct i40e_hw *hw = &pf->hw;
 	unsigned int i, cleared = 0;