MBCS: Convert the semaphore dmawritelock to the mutex API

Signed-off-by: Matthias Kaehlcke <matthias.kaehlcke@gmail.com>

Index: kernel/linux-2.6/drivers/char/mbcs.h
===================================================================
--- kernel.orig/linux-2.6/drivers/char/mbcs.h	2007-10-23 17:50:50.000000000 +0200
+++ kernel/linux-2.6/drivers/char/mbcs.h	2007-10-24 17:02:12.000000000 +0200
@@ -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;
 };
Index: kernel/linux-2.6/drivers/char/mbcs.c
===================================================================
--- kernel.orig/linux-2.6/drivers/char/mbcs.c	2007-10-23 17:50:50.000000000 +0200
+++ kernel/linux-2.6/drivers/char/mbcs.c	2007-10-24 17:02:12.000000000 +0200
@@ -311,7 +311,7 @@
 {
 	int rv = 0;
 
-	if (down_interruptible(&soft->dmawritelock))
+	if (mutex_lock_interruptible(&soft->dmawritelock))
 		return -ERESTARTSYS;
 
 	atomic_set(&soft->dmawrite_done, 0);
@@ -337,7 +337,7 @@
 	*off += len;
 
 dmawrite_exit:
-	up(&soft->dmawritelock);
+	mutex_unlock(&soft->dmawritelock);
 
 	return rv;
 }
@@ -764,7 +764,7 @@
 	init_waitqueue_head(&soft->dmaread_queue);
 	init_waitqueue_head(&soft->algo_queue);
 
-	init_MUTEX(&soft->dmawritelock);
+	mutex_init(&soft->dmawritelock);
 	init_MUTEX(&soft->dmareadlock);
 	mutex_init(&soft->algolock);
 

-- 
Matthias Kaehlcke
Linux Application Developer
Barcelona

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