MBCS: Convert the semaphore dmareadlock to the mutex API

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

--- kernel.orig/linux-2.6/drivers/char/mbcs.c	2007-10-23 17:43:36.000000000 +0200
+++ kernel/linux-2.6/drivers/char/mbcs.c	2007-10-23 17:44:11.000000000 +0200
@@ -348,7 +348,7 @@
 {
 	int rv = 0;
 
-	if (down_interruptible(&soft->dmareadlock))
+	if (mutex_lock_interruptible(&soft->dmareadlock))
 		return -ERESTARTSYS;
 
 	atomic_set(&soft->dmawrite_done, 0);
@@ -373,7 +373,7 @@
 	*off += len;
 
 dmaread_exit:
-	up(&soft->dmareadlock);
+	mutex_unlock(&soft->dmareadlock);
 
 	return rv;
 }
@@ -765,7 +765,7 @@
 	init_waitqueue_head(&soft->algo_queue);
 
 	mutex_init(&soft->dmawritelock);
-	init_MUTEX(&soft->dmareadlock);
+	mutex_init(&soft->dmareadlock);
 	mutex_init(&soft->algolock);
 
 	mbcs_getdma_init(&soft->getdma);
Index: kernel/linux-2.6/drivers/char/mbcs.h
===================================================================
--- kernel.orig/linux-2.6/drivers/char/mbcs.h	2007-10-23 17:43:38.000000000 +0200
+++ kernel/linux-2.6/drivers/char/mbcs.h	2007-10-23 17:44:33.000000000 +0200
@@ -538,7 +538,7 @@
 	atomic_t dmaread_done;
 	atomic_t algo_done;
 	struct mutex dmawritelock;
-	struct semaphore dmareadlock;
+	struct mutex dmareadlock;
 	struct mutex algolock;
 };
 

-- 
Matthias Kaehlcke
Linux Application Developer
Barcelona

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