diff --git a/drivers/net/ethernet/intel/i40e/i40e.h b/drivers/net/ethernet/intel/i40e/i40e.h
index 60dbb5b90e1a84e5957dab4d3a75dfcdf79d2905..21f2bb321cb40fb2778e8b30b0ce97999b475a2b 100644
--- a/drivers/net/ethernet/intel/i40e/i40e.h
+++ b/drivers/net/ethernet/intel/i40e/i40e.h
@@ -430,7 +430,7 @@ struct i40e_pf {
 	struct sk_buff *ptp_tx_skb;
 	struct hwtstamp_config tstamp_config;
 	unsigned long last_rx_ptp_check;
-	spinlock_t tmreg_lock; /* Used to protect the device time registers. */
+	struct mutex tmreg_lock; /* Used to protect the SYSTIME registers. */
 	u64 ptp_base_adj;
 	u32 tx_hwtstamp_timeouts;
 	u32 rx_hwtstamp_cleared;
diff --git a/drivers/net/ethernet/intel/i40e/i40e_ptp.c b/drivers/net/ethernet/intel/i40e/i40e_ptp.c
index f1feceab758a5235237df685f2b8666a5a9c0ffd..177b7fb606af6d6ed168c405802b8f5091ed0595 100644
--- a/drivers/net/ethernet/intel/i40e/i40e_ptp.c
+++ b/drivers/net/ethernet/intel/i40e/i40e_ptp.c
@@ -159,16 +159,15 @@ static int i40e_ptp_adjtime(struct ptp_clock_info *ptp, s64 delta)
 {
 	struct i40e_pf *pf = container_of(ptp, struct i40e_pf, ptp_caps);
 	struct timespec64 now, then;
-	unsigned long flags;
 
 	then = ns_to_timespec64(delta);
-	spin_lock_irqsave(&pf->tmreg_lock, flags);
+	mutex_lock(&pf->tmreg_lock);
 
 	i40e_ptp_read(pf, &now);
 	now = timespec64_add(now, then);
 	i40e_ptp_write(pf, (const struct timespec64 *)&now);
 
-	spin_unlock_irqrestore(&pf->tmreg_lock, flags);
+	mutex_unlock(&pf->tmreg_lock);
 
 	return 0;
 }
@@ -184,11 +183,10 @@ static int i40e_ptp_adjtime(struct ptp_clock_info *ptp, s64 delta)
 static int i40e_ptp_gettime(struct ptp_clock_info *ptp, struct timespec64 *ts)
 {
 	struct i40e_pf *pf = container_of(ptp, struct i40e_pf, ptp_caps);
-	unsigned long flags;
 
-	spin_lock_irqsave(&pf->tmreg_lock, flags);
+	mutex_lock(&pf->tmreg_lock);
 	i40e_ptp_read(pf, ts);
-	spin_unlock_irqrestore(&pf->tmreg_lock, flags);
+	mutex_unlock(&pf->tmreg_lock);
 
 	return 0;
 }
@@ -205,11 +203,10 @@ static int i40e_ptp_settime(struct ptp_clock_info *ptp,
 			    const struct timespec64 *ts)
 {
 	struct i40e_pf *pf = container_of(ptp, struct i40e_pf, ptp_caps);
-	unsigned long flags;
 
-	spin_lock_irqsave(&pf->tmreg_lock, flags);
+	mutex_lock(&pf->tmreg_lock);
 	i40e_ptp_write(pf, ts);
-	spin_unlock_irqrestore(&pf->tmreg_lock, flags);
+	mutex_unlock(&pf->tmreg_lock);
 
 	return 0;
 }
@@ -658,10 +655,7 @@ void i40e_ptp_init(struct i40e_pf *pf)
 		return;
 	}
 
-	/* we have to initialize the lock first, since we can't control
-	 * when the user will enter the PHC device entry points
-	 */
-	spin_lock_init(&pf->tmreg_lock);
+	mutex_init(&pf->tmreg_lock);
 
 	/* ensure we have a clock device */
 	err = i40e_ptp_create_clock(pf);