struct device_attribute *attr, char *buf)
{
struct net_device *netdev = to_net_dev(dev);
+ int ret = -EINVAL;
+
+ if (!rtnl_trylock())
+ return restart_syscall();
if (netif_running(netdev)) {
/* Synchronize carrier state with link watch,
*/
linkwatch_sync_dev(netdev);
- return sysfs_emit(buf, fmt_dec, !!netif_carrier_ok(netdev));
+ ret = sysfs_emit(buf, fmt_dec, !!netif_carrier_ok(netdev));
}
+ rtnl_unlock();
- return -EINVAL;
+ return ret;
}
static DEVICE_ATTR_RW(carrier);