MBCS: Convert the semaphore algolock 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 17:37:56.000000000 +0200
+++ kernel/linux-2.6/drivers/char/mbcs.c	2007-10-23 17:40:16.000000000 +0200
@@ -24,6 +24,7 @@
 #include <linux/mm.h>
 #include <linux/fs.h>
 #include <linux/uio.h>
+#include <linux/mutex.h>
 #include <asm/io.h>
 #include <asm/uaccess.h>
 #include <asm/system.h>
@@ -282,7 +283,7 @@
 	void *mmr_base = soft->mmr_base;
 	union cm_control cm_control;
 
-	if (down_interruptible(&soft->algolock))
+	if (mutex_lock_interruptible(&soft->algolock))
 		return -ERESTARTSYS;
 
 	atomic_set(&soft->algo_done, 0);
@@ -299,7 +300,7 @@
 	cm_control.alg_go = 1;
 	MBCS_MMR_SET(mmr_base, MBCS_CM_CONTROL, cm_control.cm_control_reg);
 
-	up(&soft->algolock);
+	mutex_unlock(&soft->algolock);
 
 	return 0;
 }
@@ -765,7 +766,7 @@
 
 	init_MUTEX(&soft->dmawritelock);
 	init_MUTEX(&soft->dmareadlock);
-	init_MUTEX(&soft->algolock);
+	mutex_init(&soft->algolock);
 
 	mbcs_getdma_init(&soft->getdma);
 	mbcs_putdma_init(&soft->putdma);
Index: kernel/linux-2.6/drivers/char/mbcs.h
===================================================================
--- kernel.orig/linux-2.6/drivers/char/mbcs.h	2007-10-23 17:38:55.000000000 +0200
+++ kernel/linux-2.6/drivers/char/mbcs.h	2007-10-23 17:39:51.000000000 +0200
@@ -539,7 +539,7 @@
 	atomic_t algo_done;
 	struct semaphore dmawritelock;
 	struct semaphore dmareadlock;
-	struct semaphore algolock;
+	struct mutex algolock;
 };
 
 static int mbcs_open(struct inode *ip, struct file *fp);

-- 
Matthias Kaehlcke
Linux Application Developer
Barcelona

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