net: mscc: ocelot: fix mutex_lock not released

If err is true, the function will be returned, but mutex_lock isn't
released.

Reported-by: Zeal Robot <zealci@zte.com.cn>
Signed-off-by: Lv Ruyi <lv.ruyi@zte.com.cn>
Signed-off-by: David S. Miller <davem@davemloft.net>

diff --git a/drivers/net/ethernet/mscc/ocelot.c b/drivers/net/ethernet/mscc/ocelot.c
index fe8abb3..b1856d8 100644 (file)
--- a/drivers/net/ethernet/mscc/ocelot.c
+++ b/drivers/net/ethernet/mscc/ocelot.c
@@ -1651,8 +1651,10 @@ int ocelot_hwstamp_set(struct ocelot *ocelot, int port, struct ifreq *ifr)
        }
 
        err = ocelot_setup_ptp_traps(ocelot, port, l2, l4);
-       if (err)
+       if (err) {
+               mutex_unlock(&ocelot->ptp_lock);
                return err;
+       }
 
        if (l2 && l4)
                cfg.rx_filter = HWTSTAMP_FILTER_PTP_V2_EVENT;