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Commit f135a8a2 authored by Hans Verkuil's avatar Hans Verkuil Committed by Mauro Carvalho Chehab
Browse files

[media] sh_vou: remove V4L2_FL_LOCK_ALL_FOPS 



Add proper locking to the file operations, allowing for the removal
of the V4L2_FL_LOCK_ALL_FOPS flag.

Signed-off-by: default avatarHans Verkuil <hans.verkuil@cisco.com>
Signed-off-by: default avatarMauro Carvalho Chehab <mchehab@redhat.com>
parent 954f5bcb

drivers/media/video/sh_vou.c

+19 −6
Original line number Diff line number Diff line
@@ -1171,6 +1171,8 @@ static int sh_vou_open(struct file *file) 


	file->private_data = vou_file;



	if (mutex_lock_interruptible(&vou_dev->fop_lock))

		return -ERESTARTSYS;

	if (atomic_inc_return(&vou_dev->use_count) == 1) {

		int ret;

		/* First open */
@@ -1181,6 +1183,7 @@ static int sh_vou_open(struct file *file) 
			atomic_dec(&vou_dev->use_count);

			pm_runtime_put(vdev->v4l2_dev->dev);

			vou_dev->status = SH_VOU_IDLE;

			mutex_unlock(&vou_dev->fop_lock);

			return ret;

		}

	}
@@ -1191,6 +1194,7 @@ static int sh_vou_open(struct file *file) 
				       V4L2_FIELD_NONE,

				       sizeof(struct videobuf_buffer), vdev,

				       &vou_dev->fop_lock);

	mutex_unlock(&vou_dev->fop_lock);



	return 0;

}
@@ -1204,10 +1208,12 @@ static int sh_vou_release(struct file *file) 
	dev_dbg(vou_file->vbq.dev, "%s()\n", __func__);



	if (!atomic_dec_return(&vou_dev->use_count)) {

		mutex_lock(&vou_dev->fop_lock);

		/* Last close */

		vou_dev->status = SH_VOU_IDLE;

		sh_vou_reg_a_set(vou_dev, VOUER, 0, 0x101);

		pm_runtime_put(vdev->v4l2_dev->dev);

		mutex_unlock(&vou_dev->fop_lock);

	}



	file->private_data = NULL;
@@ -1218,20 +1224,31 @@ static int sh_vou_release(struct file *file) 


static int sh_vou_mmap(struct file *file, struct vm_area_struct *vma)

{

	struct sh_vou_device *vou_dev = video_get_drvdata(vdev);

	struct sh_vou_file *vou_file = file->private_data;

	int ret;



	dev_dbg(vou_file->vbq.dev, "%s()\n", __func__);



	return videobuf_mmap_mapper(&vou_file->vbq, vma);

	if (mutex_lock_interruptible(&vou_dev->fop_lock))

		return -ERESTARTSYS;

	ret = videobuf_mmap_mapper(&vou_file->vbq, vma);

	mutex_unlock(&vou_dev->fop_lock);

	return ret;

}



static unsigned int sh_vou_poll(struct file *file, poll_table *wait)

{

	struct sh_vou_device *vou_dev = video_get_drvdata(vdev);

	struct sh_vou_file *vou_file = file->private_data;

	unsigned int res;



	dev_dbg(vou_file->vbq.dev, "%s()\n", __func__);



	return videobuf_poll_stream(file, &vou_file->vbq, wait);

	mutex_lock(&vou_dev->fop_lock);

	res = videobuf_poll_stream(file, &vou_file->vbq, wait);

	mutex_unlock(&vou_dev->fop_lock);

	return res;

}



static int sh_vou_g_chip_ident(struct file *file, void *fh,
@@ -1390,10 +1407,6 @@ static int __devinit sh_vou_probe(struct platform_device *pdev) 
	vdev->v4l2_dev = &vou_dev->v4l2_dev;

	vdev->release = video_device_release;

	vdev->lock = &vou_dev->fop_lock;

	/* Locking in file operations other than ioctl should be done

	   by the driver, not the V4L2 core.

	   This driver needs auditing so that this flag can be removed. */

	set_bit(V4L2_FL_LOCK_ALL_FOPS, &vdev->flags);



	vou_dev->vdev = vdev;

	video_set_drvdata(vdev, vou_dev);