f_phonet: lock-less MTU change

With the current driver, the MTU is purely indicative, so there is no
need to synchronize with the receive path.

Signed-off-by: Rémi Denis-Courmont <remi.denis-courmont@nokia.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

diff --git a/drivers/usb/gadget/f_phonet.c b/drivers/usb/gadget/f_phonet.c
index d17f108..f4eff7c 100644 (file)
--- a/drivers/usb/gadget/f_phonet.c
+++ b/drivers/usb/gadget/f_phonet.c
@@ -261,20 +261,10 @@ out:
 
 static int pn_net_mtu(struct net_device *dev, int new_mtu)
 {
-       struct phonet_port *port = netdev_priv(dev);
-       unsigned long flags;
-       int err = -EBUSY;
-
        if ((new_mtu < PHONET_MIN_MTU) || (new_mtu > PHONET_MAX_MTU))
                return -EINVAL;
-
-       spin_lock_irqsave(&port->lock, flags);
-       if (!netif_carrier_ok(dev)) {
-               dev->mtu = new_mtu;
-               err = 0;
-       }
-       spin_unlock_irqrestore(&port->lock, flags);
-       return err;
+       dev->mtu = new_mtu;
+       return 0;
 }
 
 static const struct net_device_ops pn_netdev_ops = {