[PATCH v3 1/2] net: netrom: nr_route: refactor code in nr_add_node

[Gustavo A. R. Silva]

Code refactoring in order to make the code easier to read and maintain.

Signed-off-by: Gustavo A. R. Silva <garsi...@embeddedor.com>
---
Changes in v2:
 Make use of the swap macro and remove inline keyword.

Changes in v3:
 Update subject.

 net/netrom/nr_route.c | 59 ++++++++++++++-------------------------------------
 1 file changed, 16 insertions(+), 43 deletions(-)

diff --git a/net/netrom/nr_route.c b/net/netrom/nr_route.c
index 0c59354..fba4b4c 100644
--- a/net/netrom/nr_route.c
+++ b/net/netrom/nr_route.c
@@ -80,6 +80,19 @@ static struct nr_neigh *nr_neigh_get_dev(ax25_address 
*callsign,
 
 static void nr_remove_neigh(struct nr_neigh *);
 
+/*      re-sort the routes in quality order.    */
+static void re_sort_routes(struct nr_node *nr_node, int x, int y)
+{
+       if (nr_node->routes[y].quality > nr_node->routes[x].quality) {
+               if (nr_node->which == x)
+                       nr_node->which = y;
+               else if (nr_node->which == y)
+                       nr_node->which = x;
+
+               swap(nr_node->routes[x], nr_node->routes[y]);
+       }
+}
+
 /*
  *     Add a new route to a node, and in the process add the node and the
  *     neighbour if it is new.
@@ -90,7 +103,6 @@ static int __must_check nr_add_node(ax25_address *nr, const 
char *mnemonic,
 {
        struct nr_node  *nr_node;
        struct nr_neigh *nr_neigh;
-       struct nr_route nr_route;
        int i, found;
        struct net_device *odev;
 
@@ -251,49 +263,10 @@ static int __must_check nr_add_node(ax25_address *nr, 
const char *mnemonic,
        /* Now re-sort the routes in quality order */
        switch (nr_node->count) {
        case 3:
-               if (nr_node->routes[1].quality > nr_node->routes[0].quality) {
-                       switch (nr_node->which) {
-                       case 0:
-                               nr_node->which = 1;
-                               break;
-                       case 1:
-                               nr_node->which = 0;
-                               break;
-                       }
-                       nr_route           = nr_node->routes[0];
-                       nr_node->routes[0] = nr_node->routes[1];
-                       nr_node->routes[1] = nr_route;
-               }
-               if (nr_node->routes[2].quality > nr_node->routes[1].quality) {
-                       switch (nr_node->which) {
-                       case 1:  nr_node->which = 2;
-                               break;
-
-                       case 2:  nr_node->which = 1;
-                               break;
-
-                       default:
-                               break;
-                       }
-                       nr_route           = nr_node->routes[1];
-                       nr_node->routes[1] = nr_node->routes[2];
-                       nr_node->routes[2] = nr_route;
-               }
+               re_sort_routes(nr_node, 0, 1);
+               re_sort_routes(nr_node, 1, 2);
        case 2:
-               if (nr_node->routes[1].quality > nr_node->routes[0].quality) {
-                       switch (nr_node->which) {
-                       case 0:  nr_node->which = 1;
-                               break;
-
-                       case 1:  nr_node->which = 0;
-                               break;
-
-                       default: break;
-                       }
-                       nr_route           = nr_node->routes[0];
-                       nr_node->routes[0] = nr_node->routes[1];
-                       nr_node->routes[1] = nr_route;
-                       }
+               re_sort_routes(nr_node, 0, 1);
        case 1:
                break;
        }
-- 
2.7.4

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