linux-kernel - [ 043/133] batman-adv: make batadv_test

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Date:	Thu, 11 Oct 2012 07:51:09 +0900
From:	Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:	linux-kernel@...r.kernel.org, stable@...r.kernel.org
Cc:	Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
	alan@...rguk.ukuu.org.uk,
	Linus Lüssing <linus.luessing@....de>,
	Sven Eckelmann <sven@...fation.org>,
	Antonio Quartulli <ordex@...istici.org>,
	"David S. Miller" <davem@...emloft.net>
Subject: [ 043/133] batman-adv: make batadv_test_bit() return 0 or 1 only

3.5-stable review patch.  If anyone has any objections, please let me know.

------------------


From: Linus Lüssing <linus.luessing@....de>

[ Upstream commit dbd6b11e15a2f96030da17dbeda943a8a98ee990 ]

On some architectures test_bit() can return other values than 0 or 1:

With a generic x86 OpenWrt image in a kvm setup (batadv_)test_bit()
frequently returns -1 for me, leading to batadv_iv_ogm_update_seqnos()
wrongly signaling a protected seqno window.

This patch tries to fix this issue by making batadv_test_bit() return 0
or 1 only.

Signed-off-by: Linus Lüssing <linus.luessing@....de>
Acked-by: Sven Eckelmann <sven@...fation.org>
Signed-off-by: Antonio Quartulli <ordex@...istici.org>
Signed-off-by: David S. Miller <davem@...emloft.net>
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
---
 net/batman-adv/bitarray.h |    7 ++++---
 1 file changed, 4 insertions(+), 3 deletions(-)

--- a/net/batman-adv/bitarray.h
+++ b/net/batman-adv/bitarray.h
@@ -22,8 +22,9 @@
 #ifndef _NET_BATMAN_ADV_BITARRAY_H_
 #define _NET_BATMAN_ADV_BITARRAY_H_
 
-/* returns true if the corresponding bit in the given seq_bits indicates true
- * and curr_seqno is within range of last_seqno */
+/* Returns 1 if the corresponding bit in the given seq_bits indicates true
+ * and curr_seqno is within range of last_seqno. Otherwise returns 0.
+ */
 static inline int bat_test_bit(const unsigned long *seq_bits,
 			       uint32_t last_seqno, uint32_t curr_seqno)
 {
@@ -33,7 +34,7 @@ static inline int bat_test_bit(const uns
 	if (diff < 0 || diff >= TQ_LOCAL_WINDOW_SIZE)
 		return 0;
 	else
-		return  test_bit(diff, seq_bits);
+		return test_bit(diff, seq_bits) != 0;
 }
 
 /* turn corresponding bit on, so we can remember that we got the packet */


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