MBCS: convert algolock to mutex

MBCS: Convert the semaphore algolock 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.c b/drivers/char/mbcs.c
index 3c5802a..035575c 100644 (file)
--- a/drivers/char/mbcs.c
+++ b/drivers/char/mbcs.c
@@ -23,6 +23,7 @@
 #include <linux/device.h>
 #include <linux/mm.h>
 #include <linux/uio.h>
+#include <linux/mutex.h>
 #include <asm/io.h>
 #include <asm/uaccess.h>
 #include <asm/system.h>
@@ -281,7 +282,7 @@ static inline int mbcs_algo_start(struct mbcs_soft *soft)
        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);
@@ -298,7 +299,7 @@ static inline int mbcs_algo_start(struct mbcs_soft *soft)
        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;
 }
@@ -764,7 +765,7 @@ static int mbcs_probe(struct cx_dev *dev, const struct cx_device_id *id)
 
        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);

diff --git a/drivers/char/mbcs.h b/drivers/char/mbcs.h
index c9905a3..d4d97ab 100644 (file)
--- a/drivers/char/mbcs.h
+++ b/drivers/char/mbcs.h
@@ -539,7 +539,7 @@ struct mbcs_soft {
        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);