net: use lists as arguments instead of bool upper

Currently we make use of bool upper when we want to specify if we want to
work with upper/lower list. It's, however, harder to read, debug and
occupies a lot more code.

Fix this by just passing the correct upper/lower_dev_list list_head pointer
instead of bool upper, and work internally with it.

CC: "David S. Miller" <davem@davemloft.net>
CC: Eric Dumazet <edumazet@google.com>
CC: Jiri Pirko <jiri@resnulli.us>
CC: Alexander Duyck <alexander.h.duyck@intel.com>
CC: Cong Wang <amwang@redhat.com>
Signed-off-by: Veaceslav Falico <vfalico@redhat.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

diff --git a/net/core/dev.c b/net/core/dev.c
index 5c713f2..9be7937 100644 (file)
--- a/net/core/dev.c
+++ b/net/core/dev.c
@@ -4385,12 +4385,9 @@ struct netdev_adjacent {
 
 static struct netdev_adjacent *__netdev_find_adj(struct net_device *dev,
                                                 struct net_device *adj_dev,
-                                                bool upper)
+                                                struct list_head *dev_list)
 {
        struct netdev_adjacent *adj;
-       struct list_head *dev_list;
-
-       dev_list = upper ? &dev->upper_dev_list : &dev->lower_dev_list;
 
        list_for_each_entry(adj, dev_list, list) {
                if (adj->dev == adj_dev)
@@ -4402,13 +4399,13 @@ static struct netdev_adjacent *__netdev_find_adj(struct net_device *dev,
 static inline struct netdev_adjacent *__netdev_find_upper(struct net_device *dev,
                                                          struct net_device *udev)
 {
-       return __netdev_find_adj(dev, udev, true);
+       return __netdev_find_adj(dev, udev, &dev->upper_dev_list);
 }
 
 static inline struct netdev_adjacent *__netdev_find_lower(struct net_device *dev,
                                                          struct net_device *ldev)
 {
-       return __netdev_find_adj(dev, ldev, false);
+       return __netdev_find_adj(dev, ldev, &dev->lower_dev_list);
 }
 
 /**
@@ -4514,12 +4511,12 @@ EXPORT_SYMBOL(netdev_master_upper_dev_get_rcu);
 
 static int __netdev_adjacent_dev_insert(struct net_device *dev,
                                        struct net_device *adj_dev,
-                                       bool neighbour, bool master,
-                                       bool upper)
+                                       struct list_head *dev_list,
+                                       bool neighbour, bool master)
 {
        struct netdev_adjacent *adj;
 
-       adj = __netdev_find_adj(dev, adj_dev, upper);
+       adj = __netdev_find_adj(dev, adj_dev, dev_list);
 
        if (adj) {
                BUG_ON(neighbour);
@@ -4538,19 +4535,14 @@ static int __netdev_adjacent_dev_insert(struct net_device *dev,
 
        dev_hold(adj_dev);
        pr_debug("dev_hold for %s, because of %s link added from %s to %s\n",
-                adj_dev->name, upper ? "upper" : "lower", dev->name,
-                adj_dev->name);
+                adj_dev->name, dev_list == &dev->upper_dev_list ?
+                "upper" : "lower", dev->name, adj_dev->name);
 
-       if (!upper) {
-               list_add_tail_rcu(&adj->list, &dev->lower_dev_list);
-               return 0;
-       }
-
-       /* Ensure that master upper link is always the first item in list. */
+       /* Ensure that master link is always the first item in list. */
        if (master)
-               list_add_rcu(&adj->list, &dev->upper_dev_list);
+               list_add_rcu(&adj->list, dev_list);
        else
-               list_add_tail_rcu(&adj->list, &dev->upper_dev_list);
+               list_add_tail_rcu(&adj->list, dev_list);
 
        return 0;
 }
@@ -4559,27 +4551,25 @@ static inline int __netdev_upper_dev_insert(struct net_device *dev,
                                            struct net_device *udev,
                                            bool master, bool neighbour)
 {
-       return __netdev_adjacent_dev_insert(dev, udev, neighbour, master,
-                                           true);
+       return __netdev_adjacent_dev_insert(dev, udev, &dev->upper_dev_list,
+                                           neighbour, master);
 }
 
 static inline int __netdev_lower_dev_insert(struct net_device *dev,
                                            struct net_device *ldev,
                                            bool neighbour)
 {
-       return __netdev_adjacent_dev_insert(dev, ldev, neighbour, false,
-                                           false);
+       return __netdev_adjacent_dev_insert(dev, ldev, &dev->lower_dev_list,
+                                           neighbour, false);
 }
 
 void __netdev_adjacent_dev_remove(struct net_device *dev,
-                                 struct net_device *adj_dev, bool upper)
+                                 struct net_device *adj_dev,
+                                 struct list_head *dev_list)
 {
        struct netdev_adjacent *adj;
 
-       if (upper)
-               adj = __netdev_find_upper(dev, adj_dev);
-       else
-               adj = __netdev_find_lower(dev, adj_dev);
+       adj = __netdev_find_adj(dev, adj_dev, dev_list);
 
        if (!adj)
                BUG();
@@ -4591,8 +4581,8 @@ void __netdev_adjacent_dev_remove(struct net_device *dev,
 
        list_del_rcu(&adj->list);
        pr_debug("dev_put for %s, because of %s link removed from %s to %s\n",
-                adj_dev->name, upper ? "upper" : "lower", dev->name,
-                adj_dev->name);
+                adj_dev->name, dev_list == &dev->upper_dev_list ?
+                "upper" : "lower", dev->name, adj_dev->name);
        dev_put(adj_dev);
        kfree_rcu(adj, rcu);
 }
@@ -4600,13 +4590,13 @@ void __netdev_adjacent_dev_remove(struct net_device *dev,
 static inline void __netdev_upper_dev_remove(struct net_device *dev,
                                             struct net_device *udev)
 {
-       return __netdev_adjacent_dev_remove(dev, udev, true);
+       return __netdev_adjacent_dev_remove(dev, udev, &dev->upper_dev_list);
 }
 
 static inline void __netdev_lower_dev_remove(struct net_device *dev,
                                             struct net_device *ldev)
 {
-       return __netdev_adjacent_dev_remove(dev, ldev, false);
+       return __netdev_adjacent_dev_remove(dev, ldev, &dev->lower_dev_list);
 }
 
 int __netdev_adjacent_dev_insert_link(struct net_device *dev,