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authorOleg Nesterov <oleg@tv-sign.ru>2007-08-10 15:21:17 -0700
committerDavid S. Miller <davem@sunset.davemloft.net>2007-08-13 22:52:09 -0700
commitd725fdc8027a4cd961f58d92917fbb91b171abfa (patch)
tree5e437314aa2f2c6e59705c4deb45e50959317099 /net/dccp
parentb5890d8ba47741425fe3c0d753e1b57bc0561b7b (diff)
[DCCP]: fix theoretical ccids_{read,write}_lock() race
Make sure that spin_unlock_wait() is properly ordered wrt atomic_inc(). (akpm: can't we convert this code to use rwlocks?) Signed-off-by: Oleg Nesterov <oleg@tv-sign.ru> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'net/dccp')
-rw-r--r--net/dccp/ccid.c1
1 files changed, 1 insertions, 0 deletions
diff --git a/net/dccp/ccid.c b/net/dccp/ccid.c
index ccbf72c793b6..c45088b5e6fb 100644
--- a/net/dccp/ccid.c
+++ b/net/dccp/ccid.c
@@ -40,6 +40,7 @@ static inline void ccids_write_unlock(void)
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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