[09/16] batman-adv: Only increase refcounter once for alternate router

Submitted by Antonio Quartulli on Oct. 28, 2012, 11:17 a.m.

Details

Message ID 1351423037-5292-10-git-send-email-ordex@autistici.org
State Changes Requested
Delegated to: David Miller
Headers show

Commit Message

Antonio Quartulli Oct. 28, 2012, 11:17 a.m.
From: Sven Eckelmann <sven@narfation.org>

The test whether we can use a router for alternating bonding should only be
done once because it is already known that it is still usable and will not be
deleted from the list soon.

This patch addresses Coverity #712285: Unchecked return value

Signed-off-by: Sven Eckelmann <sven@narfation.org>
Signed-off-by: Antonio Quartulli <ordex@autistici.org>
---
 net/batman-adv/routing.c | 23 ++++++++---------------
 1 file changed, 8 insertions(+), 15 deletions(-)

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diff --git a/net/batman-adv/routing.c b/net/batman-adv/routing.c
index 8bdafc8..1ac072d 100644
--- a/net/batman-adv/routing.c
+++ b/net/batman-adv/routing.c
@@ -549,25 +549,18 @@  batadv_find_ifalter_router(struct batadv_orig_node *primary_orig,
 		if (tmp_neigh_node->if_incoming == recv_if)
 			continue;
 
+		if (router && tmp_neigh_node->tq_avg <= router->tq_avg)
+			continue;
+
 		if (!atomic_inc_not_zero(&tmp_neigh_node->refcount))
 			continue;
 
-		/* if we don't have a router yet
-		 * or this one is better, choose it.
-		 */
-		if ((!router) ||
-		    (tmp_neigh_node->tq_avg > router->tq_avg)) {
-			/* decrement refcount of
-			 * previously selected router
-			 */
-			if (router)
-				batadv_neigh_node_free_ref(router);
+		/* decrement refcount of previously selected router */
+		if (router)
+			batadv_neigh_node_free_ref(router);
 
-			router = tmp_neigh_node;
-			atomic_inc_not_zero(&router->refcount);
-		}
-
-		batadv_neigh_node_free_ref(tmp_neigh_node);
+		/* we found a better router (or at least one valid router) */
+		router = tmp_neigh_node;
 	}
 
 	/* use the first candidate if nothing was found. */