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batman-adv: Fix possible side-effects in _batadv_dbg

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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>
Signed-off-by: Simon Wunderlich <sw@simonwunderlich.de>
This commit is contained in:
Sven Eckelmann 2017-02-22 17:16:41 +01:00 committed by Simon Wunderlich
parent 1fda4c0ac0
commit a09c94d07b
1 changed files with 3 additions and 2 deletions
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5
net/batman-adv/log.h
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@ -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 */