netdev - [PATCH 1/2] batman-adv: count_real_packets() in batman-adv assumes char is signed

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Date:	Wed, 15 Jun 2011 00:51:32 +0100
From:	David Howells <dhowells@...hat.com>
To:	unlisted-recipients:; (no To-header on input)
Cc:	David Howells <dhowells@...hat.com>,
	Marek Lindner <lindner_marek@...oo.de>,
	Simon Wunderlich <siwu@....tu-chemnitz.de>,
	Sven Eckelmann <sven@...fation.org>,
	b.a.t.m.a.n@...ts.open-mesh.org, netdev@...r.kernel.org
Subject: [PATCH 1/2] batman-adv: count_real_packets() in batman-adv assumes
 char is signed

count_real_packets() in batman-adv assumes char is signed, and returns -1
through it:

net/batman-adv/routing.c: In function 'receive_bat_packet':
net/batman-adv/routing.c:739: warning: comparison is always false due to limited range of data type

Use int instead.

This is also looks a bit weird as (presumably signed) is_duplicate is
constructed by OR'ding together the unsigned results of get_bit_status()
(though the latter only returns 0 or 1).

Signed-off-by: David Howells <dhowells@...hat.com>
cc: Marek Lindner <lindner_marek@...oo.de>
cc: Simon Wunderlich <siwu@....tu-chemnitz.de>
cc: Sven Eckelmann <sven@...fation.org>
cc: b.a.t.m.a.n@...ts.open-mesh.org
cc: netdev@...r.kernel.org
---

 net/batman-adv/routing.c |   10 +++++-----
 1 files changed, 5 insertions(+), 5 deletions(-)

diff --git a/net/batman-adv/routing.c b/net/batman-adv/routing.c
index bb1c3ec..3075fcb 100644
--- a/net/batman-adv/routing.c
+++ b/net/batman-adv/routing.c
@@ -531,15 +531,15 @@ static int window_protected(struct bat_priv *bat_priv,
  *  -1 the packet is old and has been received while the seqno window
  *     was protected. Caller should drop it.
  */
-static char count_real_packets(struct ethhdr *ethhdr,
-			       struct batman_packet *batman_packet,
-			       struct hard_iface *if_incoming)
+static int count_real_packets(struct ethhdr *ethhdr,
+			      struct batman_packet *batman_packet,
+			      struct hard_iface *if_incoming)
 {
 	struct bat_priv *bat_priv = netdev_priv(if_incoming->soft_iface);
 	struct orig_node *orig_node;
 	struct neigh_node *tmp_neigh_node;
 	struct hlist_node *node;
-	char is_duplicate = 0;
+	uint8_t is_duplicate = 0;
 	int32_t seq_diff;
 	int need_update = 0;
 	int set_mark, ret = -1;
@@ -608,7 +608,7 @@ void receive_bat_packet(struct ethhdr *ethhdr,
 	char has_directlink_flag;
 	char is_my_addr = 0, is_my_orig = 0, is_my_oldorig = 0;
 	char is_broadcast = 0, is_bidirectional, is_single_hop_neigh;
-	char is_duplicate;
+	int is_duplicate;
 	uint32_t if_incoming_seqno;
 
 	/* Silently drop when the batman packet is actually not a

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