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>

1 files changed, 2 insertions, 12 deletions

diff --git a/drivers/usb/gadget/f_phonet.c b/drivers/usb/gadget/f_phonet.c
index d17f1082df96..f4eff7ca0d36 100644
--- 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 = {