From: Linus Torvalds <torvalds@linux-foundation.org>
Date: Fri, 3 May 2013 22:22:00 +0000 (-0700)
Subject: ipc: sem_putref() does not need the semaphore lock any more
X-Git-Tag: firefly_0821_release~3680^2~575^2~5
X-Git-Url: http://demsky.eecs.uci.edu/git/?a=commitdiff_plain;h=73b29505c36eeb4751eccad41f6aad78562521f8;p=firefly-linux-kernel-4.4.55.git

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>
---

diff --git a/ipc/sem.c b/ipc/sem.c
index 4b4139f6ad5c..5cf7b4c093b3 100644
--- a/ipc/sem.c
+++ b/ipc/sem.c
@@ -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)