[B.A.T.M.A.N.] [PATCH v2 3/4] batman-adv: Fix possible side-effects in _batadv_dbg

Sven Eckelmann
2017-02-22T16:16:41Z

An argument of a macro should not be evaluated multiple times. Otherwise
embedded operations in these arguments will be executed multiple times.

Signed-off-by: Sven Eckelmann <sven@narfation.org>
---
v2:
- remove BATADV_PRINT_VID part

net/batman-adv/log.h | 5 +++--
1 file changed, 3 insertions(+), 2 deletions(-)

diff --git a/net/batman-adv/log.h b/net/batman-adv/log.h
index 7a2b9f4..65ce97e 100644
--- a/net/batman-adv/log.h
+++ b/net/batman-adv/log.h
@@ -73,9 +73,10 @@ __printf(2, 3);
/* possibly ratelimited debug output */
#define _batadv_dbg(type, bat_priv, ratelimited, fmt, arg...) \
do { \
- if (atomic_read(&(bat_priv)->log_level) & (type) && \
+ struct batadv_priv *__batpriv = (bat_priv); \
+ if (atomic_read(&__batpriv->log_level) & (type) && \
(!(ratelimited) || net_ratelimit())) \
- batadv_debug_log(bat_priv, fmt, ## arg); \
+ batadv_debug_log(__batpriv, fmt, ## arg); \
} \
while (0)
#else /* !CONFIG_BATMAN_ADV_DEBUG */
--
2.11.0