net: dp83640: reinforce locking rules.

Callers of the ext_write function are supposed to hold a mutex that
protects the state of the dialed page, but one caller was missing the
lock from the very start, and over time the code has been changed
without following the rule.  This patch cleans up the call sites in
violation of the rule.

Signed-off-by: Richard Cochran <richardcochran@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

diff --git a/drivers/net/phy/dp83640.c b/drivers/net/phy/dp83640.c
index 7a068d99ea46cebeb957fd098b3e099342eace47..e570036275e26aa6ff7ad60762b69ec95ecf3153 100644 (file)
--- 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;
 }