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ipc: sem_putref() does not need the semaphore lock any more 

ipc_rcu_putref() uses atomics for the refcount, and the games to lock
and unlock the semaphore just to try to keep the reference counting
working are no longer useful.

Acked-by: Davidlohr Bueso <davidlohr.bueso@hp.com>
Cc: Rik van Riel <riel@redhat.com>
Cc: Al Viro <viro@zeniv.linux.org.uk>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
This commit is contained in:
Linus Torvalds 2013-05-03 15:22:00 -07:00
parent 6d49dab8ae
commit 73b29505c3
1 changed files with 1 additions and 3 deletions
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4
ipc/sem.c
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@ -329,9 +329,7 @@ static inline void sem_lock_and_putref(struct sem_array *sma)
static inline void sem_putref(struct sem_array *sma)
{
sem_lock_and_putref(sma);
sem_unlock(sma, -1);
rcu_read_unlock();
ipc_rcu_putref(sma);
}
static inline void sem_rmid(struct ipc_namespace *ns, struct sem_array *s)