From mboxrd@z Thu Jan  1 00:00:00 1970
From: Henrik Rydberg <rydberg@bitmath.org>
Subject: Re: [PATCH] Introduce buflock, a one-to-many circular buffer mechanism
 (rev2)
Date: Sun, 20 Jun 2010 22:13:11 +0200
Message-ID: <4C1E7657.9070606@bitmath.org>
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To: Dmitry Torokhov <dmitry.torokhov@gmail.com>
Cc: linux-input@vger.kernel.org, linux-kernel@vger.kernel.org, Andrew Morton <akpm@linux-foundation.org>, Oleg Nesterov <oleg@redhat.com>, Jiri Kosina <jkosina@suse.cz>, Jonathan Cameron <jic23@cam.ac.uk>

...

diff --git a/include/linux/buflock.h b/include/linux/buflock.h
index 3d5df22..05996d5 100644
--- a/include/linux/buflock.h
+++ b/include/linux/buflock.h
@@ -125,8 +125,8 @@ static inline unsigned int bufwrite_at(const struct buflock_
writer *bw)
  */
 static inline void bufwrite_unlock(struct buflock_writer *bw)
 {
-	++bw->head;
 	smp_wmb();
+	++bw->head;
 }