xps: Add xps_queue_release function

This patch moves the xps specific parts in netdev_queue_release into
its own function which netdev_queue_release can call.  This allows
netdev_queue_release to be more generic (for adding new attributes
to tx queues).

Signed-off-by: Tom Herbert <therbert@google.com>
Acked-by: Eric Dumazet <eric.dumazet@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

diff --git a/net/core/net-sysfs.c b/net/core/net-sysfs.c
index db6c2f8..b17c14a 100644 (file)
--- a/net/core/net-sysfs.c
+++ b/net/core/net-sysfs.c
@@ -910,6 +910,52 @@ static DEFINE_MUTEX(xps_map_mutex);
 #define xmap_dereference(P)            \
        rcu_dereference_protected((P), lockdep_is_held(&xps_map_mutex))
 
+static void xps_queue_release(struct netdev_queue *queue)
+{
+       struct net_device *dev = queue->dev;
+       struct xps_dev_maps *dev_maps;
+       struct xps_map *map;
+       unsigned long index;
+       int i, pos, nonempty = 0;
+
+       index = get_netdev_queue_index(queue);
+
+       mutex_lock(&xps_map_mutex);
+       dev_maps = xmap_dereference(dev->xps_maps);
+
+       if (dev_maps) {
+               for_each_possible_cpu(i) {
+                       map = xmap_dereference(dev_maps->cpu_map[i]);
+                       if (!map)
+                               continue;
+
+                       for (pos = 0; pos < map->len; pos++)
+                               if (map->queues[pos] == index)
+                                       break;
+
+                       if (pos < map->len) {
+                               if (map->len > 1)
+                                       map->queues[pos] =
+                                           map->queues[--map->len];
+                               else {
+                                       RCU_INIT_POINTER(dev_maps->cpu_map[i],
+                                           NULL);
+                                       kfree_rcu(map, rcu);
+                                       map = NULL;
+                               }
+                       }
+                       if (map)
+                               nonempty = 1;
+               }
+
+               if (!nonempty) {
+                       RCU_INIT_POINTER(dev->xps_maps, NULL);
+                       kfree_rcu(dev_maps, rcu);
+               }
+       }
+       mutex_unlock(&xps_map_mutex);
+}
+
 static ssize_t store_xps_map(struct netdev_queue *queue,
                      struct netdev_queue_attribute *attribute,
                      const char *buf, size_t len)
@@ -1054,49 +1100,8 @@ static struct attribute *netdev_queue_default_attrs[] = {
 static void netdev_queue_release(struct kobject *kobj)
 {
        struct netdev_queue *queue = to_netdev_queue(kobj);
-       struct net_device *dev = queue->dev;
-       struct xps_dev_maps *dev_maps;
-       struct xps_map *map;
-       unsigned long index;
-       int i, pos, nonempty = 0;
-
-       index = get_netdev_queue_index(queue);
-
-       mutex_lock(&xps_map_mutex);
-       dev_maps = xmap_dereference(dev->xps_maps);
 
-       if (dev_maps) {
-               for_each_possible_cpu(i) {
-                       map = xmap_dereference(dev_maps->cpu_map[i]);
-                       if (!map)
-                               continue;
-
-                       for (pos = 0; pos < map->len; pos++)
-                               if (map->queues[pos] == index)
-                                       break;
-
-                       if (pos < map->len) {
-                               if (map->len > 1)
-                                       map->queues[pos] =
-                                           map->queues[--map->len];
-                               else {
-                                       RCU_INIT_POINTER(dev_maps->cpu_map[i],
-                                           NULL);
-                                       kfree_rcu(map, rcu);
-                                       map = NULL;
-                               }
-                       }
-                       if (map)
-                               nonempty = 1;
-               }
-
-               if (!nonempty) {
-                       RCU_INIT_POINTER(dev->xps_maps, NULL);
-                       kfree_rcu(dev_maps, rcu);
-               }
-       }
-
-       mutex_unlock(&xps_map_mutex);
+       xps_queue_release(queue);
 
        memset(kobj, 0, sizeof(*kobj));
        dev_put(queue->dev);