[IPV4]: Unify assignment of fi to fib_result

Signed-off-by: Denis V. Lunev <den@openvz.org>
Acked-by: Alexey Kuznetsov <kuznet@ms2.inr.ac.ru>
Signed-off-by: David S. Miller <davem@davemloft.net>

net/ipv4/fib_hash.c

@@ -315,10 +315,7 @@ fn_hash_select_default(struct fib_table *tb, const struct flowi *flp, struct fib
 					break;
 			} else if (!fib_detect_death(fi, order, &last_resort,
 						     &last_idx, fn_hash_last_dflt)) {
-				if (res->fi)
-					fib_info_put(res->fi);
-				res->fi = fi;
-				atomic_inc(&fi->fib_clntref);
+				fib_result_assign(res, fi);
 				fn_hash_last_dflt = order;
 				goto out;
 			}
@@ -333,21 +330,13 @@ fn_hash_select_default(struct fib_table *tb, const struct flowi *flp, struct fib
 	}
 
 	if (!fib_detect_death(fi, order, &last_resort, &last_idx, fn_hash_last_dflt)) {
-		if (res->fi)
-			fib_info_put(res->fi);
-		res->fi = fi;
-		atomic_inc(&fi->fib_clntref);
+		fib_result_assign(res, fi);
 		fn_hash_last_dflt = order;
 		goto out;
 	}
 
-	if (last_idx >= 0) {
-		if (res->fi)
-			fib_info_put(res->fi);
-		res->fi = last_resort;
-		if (last_resort)
-			atomic_inc(&last_resort->fib_clntref);
-	}
+	if (last_idx >= 0)
+		fib_result_assign(res, last_resort);
 	fn_hash_last_dflt = last_idx;
 out:
 	read_unlock(&fib_hash_lock);

net/ipv4/fib_lookup.h

@@ -38,4 +38,14 @@ extern int fib_detect_death(struct fib_info *fi, int order,
 			    struct fib_info **last_resort,
 			    int *last_idx, int dflt);
 
+static inline void fib_result_assign(struct fib_result *res,
+				     struct fib_info *fi)
+{
+	if (res->fi != NULL)
+		fib_info_put(res->fi);
+	res->fi = fi;
+	if (fi != NULL)
+		atomic_inc(&fi->fib_clntref);
+}
+
 #endif /* _FIB_LOOKUP_H */

net/ipv4/fib_trie.c

@@ -1831,10 +1831,7 @@ fn_trie_select_default(struct fib_table *tb, const struct flowi *flp, struct fib
 				break;
 		} else if (!fib_detect_death(fi, order, &last_resort,
 					     &last_idx, trie_last_dflt)) {
-			if (res->fi)
-				fib_info_put(res->fi);
-			res->fi = fi;
-			atomic_inc(&fi->fib_clntref);
+			fib_result_assign(res, fi);
 			trie_last_dflt = order;
 			goto out;
 		}
@@ -1847,20 +1844,12 @@ fn_trie_select_default(struct fib_table *tb, const struct flowi *flp, struct fib
 	}
 
 	if (!fib_detect_death(fi, order, &last_resort, &last_idx, trie_last_dflt)) {
-		if (res->fi)
-			fib_info_put(res->fi);
-		res->fi = fi;
-		atomic_inc(&fi->fib_clntref);
+		fib_result_assign(res, fi);
 		trie_last_dflt = order;
 		goto out;
 	}
-	if (last_idx >= 0) {
-		if (res->fi)
-			fib_info_put(res->fi);
-		res->fi = last_resort;
-		if (last_resort)
-			atomic_inc(&last_resort->fib_clntref);
-	}
+	if (last_idx >= 0)
+		fib_result_assign(res, last_resort);
 	trie_last_dflt = last_idx;
  out:;
 	rcu_read_unlock();