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Subject[PATCH] fix theoretical ccids_{read,write}_lock() race
Make sure that spin_unlock_wait() is properly ordered wrt atomic_inc().

Signed-off-by: Oleg Nesterov <oleg@tv-sign.ru>

--- t/net/dccp/ccid.c~ccid 2006-12-18 18:17:31.000000000 +0300
+++ t/net/dccp/ccid.c 2007-07-21 18:29:21.000000000 +0400
@@ -40,6 +40,7 @@ static inline void ccids_write_unlock(vo
static inline void ccids_read_lock(void)
{
atomic_inc(&ccids_lockct);
+ smp_mb__after_atomic_inc();
spin_unlock_wait(&ccids_lock);
}

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