From: Davidlohr Bueso <dave@stgolabs.net>
Date: Wed, 29 Jan 2020 18:10:41 +0000 (-0800)
Subject: Bluetooth: optimize barrier usage for Rmw atomics
X-Git-Url: http://git.maquefel.me/?a=commitdiff_plain;h=fe66483156050f4eb63c4a1988f3b439e6c9ff2a;p=linux.git

Bluetooth: optimize barrier usage for Rmw atomics

Use smp_mb__before_atomic() instead of smp_mb() and avoid the
unnecessary barrier for non LL/SC architectures, such as x86.

Signed-off-by: Davidlohr Bueso <dbueso@suse.de>
Signed-off-by: Marcel Holtmann <marcel@holtmann.org>
---

diff --git a/net/bluetooth/hidp/core.c b/net/bluetooth/hidp/core.c
index bef84b95e2c47..3b4fa27a44e64 100644
--- a/net/bluetooth/hidp/core.c
+++ b/net/bluetooth/hidp/core.c
@@ -1279,7 +1279,7 @@ static int hidp_session_thread(void *arg)
 	add_wait_queue(sk_sleep(session->intr_sock->sk), &intr_wait);
 	/* This memory barrier is paired with wq_has_sleeper(). See
 	 * sock_poll_wait() for more information why this is needed. */
-	smp_mb();
+	smp_mb__before_atomic();
 
 	/* notify synchronous startup that we're ready */
 	atomic_inc(&session->state);