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V4L/DVB (5811): Use mutex instead of semaphore in Virtual Video driver

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The Virtual Video driver uses a semaphore as mutex. Use the mutex API
instead of the (binary) semaphore.

Signed-off-by: Matthias Kaehlcke <matthias.kaehlcke@gmail.com>
Signed-off-by: Mauro Carvalho Chehab <mchehab@infradead.org>
This commit is contained in:
Matthias Kaehlcke 2007-07-02 10:19:38 -03:00 committed by Mauro Carvalho Chehab
parent b9378fdbc3
commit 51b540292a
1 changed files with 8 additions and 7 deletions
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15
drivers/media/video/vivi.c
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@ -25,6 +25,7 @@
#include <linux/pci.h>
#include <linux/random.h>
#include <linux/version.h>
#include <linux/mutex.h>
#include <linux/videodev2.h>
#include <linux/dma-mapping.h>
#ifdef CONFIG_VIDEO_V4L1_COMPAT
@ -165,7 +166,7 @@ static LIST_HEAD(vivi_devlist);
struct vivi_dev {
struct list_head vivi_devlist;
struct semaphore lock;
struct mutex lock;
int users;
@ -738,16 +739,16 @@ static struct videobuf_queue_ops vivi_video_qops = {
static int res_get(struct vivi_dev *dev, struct vivi_fh *fh)
{
/* is it free? */
down(&dev->lock);
mutex_lock(&dev->lock);
if (dev->resources) {
/* no, someone else uses it */
up(&dev->lock);
mutex_unlock(&dev->lock);
return 0;
}
/* it's free, grab it */
dev->resources =1;
dprintk(1,"res: get\n");
up(&dev->lock);
mutex_unlock(&dev->lock);
return 1;
}
@ -758,10 +759,10 @@ static int res_locked(struct vivi_dev *dev)
static void res_free(struct vivi_dev *dev, struct vivi_fh *fh)
{
down(&dev->lock);
mutex_lock(&dev->lock);
dev->resources = 0;
dprintk(1,"res: put\n");
up(&dev->lock);
mutex_lock(&dev->lock);
}
/* ------------------------------------------------------------------
@ -1260,7 +1261,7 @@ static int __init vivi_init(void)
init_waitqueue_head(&dev->vidq.wq);
/* initialize locks */
init_MUTEX(&dev->lock);
mutex_init(&dev->lock);
dev->vidq.timeout.function = vivi_vid_timeout;
dev->vidq.timeout.data = (unsigned long)dev;