Commit fe664831 authored by Davidlohr Bueso's avatar Davidlohr Bueso Committed by Marcel Holtmann
Browse files

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: default avatarDavidlohr Bueso <dbueso@suse.de>
Signed-off-by: default avatarMarcel Holtmann <marcel@holtmann.org>
parent 6c08fc89

net/bluetooth/hidp/core.c

+1 −1
Original line number Diff line number Diff line
@@ -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);

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