MBCS: convert dmawritelock to mutex

MBCS: Convert the semaphore dmawritelock to the mutex API

Signed-off-by: Matthias Kaehlcke <matthias.kaehlcke@gmail.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
diff --git a/drivers/char/mbcs.h b/drivers/char/mbcs.h
index d4d97ab..b054351 100644
--- a/drivers/char/mbcs.h
+++ b/drivers/char/mbcs.h
@@ -537,7 +537,7 @@
 	atomic_t dmawrite_done;
 	atomic_t dmaread_done;
 	atomic_t algo_done;
-	struct semaphore dmawritelock;
+	struct mutex dmawritelock;
 	struct semaphore dmareadlock;
 	struct mutex algolock;
 };