1 files changed, 16 insertions, 1 deletions

diff --git a/drivers/net/phy/dp83640.c b/drivers/net/phy/dp83640.c
index 7a068d99ea46..e570036275e2 100644
--- a/drivers/net/phy/dp83640.c
+++ b/drivers/net/phy/dp83640.c
@@ -496,7 +496,9 @@ static int ptp_dp83640_enable(struct ptp_clock_info *ptp,
                         else
                                 evnt |= EVNT_RISE;
                 }
+                mutex_lock(&clock->extreg_lock);
                 ext_write(0, phydev, PAGE5, PTP_EVNT, evnt);
+                mutex_unlock(&clock->extreg_lock);
                 return 0;
 
         case PTP_CLK_REQ_PEROUT:
@@ -532,6 +534,8 @@ static u8 status_frame_src[6] = { 0x08, 0x00, 0x17, 0x0B, 0x6B, 0x0F };
 
 static void enable_status_frames(struct phy_device *phydev, bool on)
 {
+        struct dp83640_private *dp83640 = phydev->priv;
+        struct dp83640_clock *clock = dp83640->clock;
         u16 cfg0 = 0, ver;
 
         if (on)
@@ -539,9 +543,13 @@ static void enable_status_frames(struct phy_device *phydev, bool on)
 
         ver = (PSF_PTPVER & VERSIONPTP_MASK) << VERSIONPTP_SHIFT;
 
+        mutex_lock(&clock->extreg_lock);
+
         ext_write(0, phydev, PAGE5, PSF_CFG0, cfg0);
         ext_write(0, phydev, PAGE6, PSF_CFG1, ver);
 
+        mutex_unlock(&clock->extreg_lock);
+
         if (!phydev->attached_dev) {
                 pr_warn("expected to find an attached netdevice\n");
                 return;
@@ -1173,11 +1181,18 @@ static int dp83640_config_init(struct phy_device *phydev)
 
         if (clock->chosen && !list_empty(&clock->phylist))
                 recalibrate(clock);
-        else
+        else {
+                mutex_lock(&clock->extreg_lock);
                 enable_broadcast(phydev, clock->page, 1);
+                mutex_unlock(&clock->extreg_lock);
+        }
 
         enable_status_frames(phydev, true);
+
+        mutex_lock(&clock->extreg_lock);
         ext_write(0, phydev, PAGE4, PTP_CTL, PTP_ENABLE);
+        mutex_unlock(&clock->extreg_lock);
+
         return 0;
 }