char *buf)
{
struct net_device *dev = queue->dev;
+ int num_tc, tc;
int index;
- int tc;
if (!netif_is_multiqueue(dev))
return -ENOENT;
+ if (!rtnl_trylock())
+ return restart_syscall();
+
index = get_netdev_queue_index(queue);
/* If queue belongs to subordinate dev use its TC mapping */
dev = netdev_get_tx_queue(dev, index)->sb_dev ? : dev;
+ num_tc = dev->num_tc;
tc = netdev_txq_to_tc(dev, index);
+
+ rtnl_unlock();
+
if (tc < 0)
return -EINVAL;
* belongs to the root device it will be reported with just the
* traffic class, so just "0" for TC 0 for example.
*/
- return dev->num_tc < 0 ? sprintf(buf, "%d%d\n", tc, dev->num_tc) :
- sprintf(buf, "%d\n", tc);
+ return num_tc < 0 ? sprintf(buf, "%d%d\n", tc, num_tc) :
+ sprintf(buf, "%d\n", tc);
}
#ifdef CONFIG_XPS