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[media] fsl-viu: remove V4L2_FL_LOCK_ALL_FOPS

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

Signed-off-by: Hans Verkuil <hans.verkuil@cisco.com>
Signed-off-by: Mauro Carvalho Chehab <mchehab@redhat.com>
This commit is contained in:
Hans Verkuil 2012-06-23 08:46:43 -03:00 committed by Mauro Carvalho Chehab
parent a2e10b5aee
commit 87cb0278c9
1 changed files with 22 additions and 5 deletions
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27
drivers/media/video/fsl-viu.c
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@ -1279,10 +1279,16 @@ static int viu_open(struct file *file)
dprintk(1, "open minor=%d type=%s users=%d\n", minor,
v4l2_type_names[V4L2_BUF_TYPE_VIDEO_CAPTURE], dev->users);
if (mutex_lock_interruptible(&dev->lock)) {
dev->users--;
return -ERESTARTSYS;
}
/* allocate and initialize per filehandle data */
fh = kzalloc(sizeof(*fh), GFP_KERNEL);
if (!fh) {
dev->users--;
mutex_unlock(&dev->lock);
return -ENOMEM;
}
@ -1325,6 +1331,7 @@ static int viu_open(struct file *file)
fh->type, V4L2_FIELD_INTERLACED,
sizeof(struct viu_buf), fh,
&fh->dev->lock);
mutex_unlock(&dev->lock);
return 0;
}
@ -1340,9 +1347,12 @@ static ssize_t viu_read(struct file *file, char __user *data, size_t count,
dev->ovenable = 0;
if (fh->type == V4L2_BUF_TYPE_VIDEO_CAPTURE) {
if (mutex_lock_interruptible(&dev->lock))
return -ERESTARTSYS;
viu_start_dma(dev);
ret = videobuf_read_stream(&fh->vb_vidq, data, count,
ppos, 0, file->f_flags & O_NONBLOCK);
mutex_unlock(&dev->lock);
return ret;
}
return 0;
@ -1352,11 +1362,16 @@ static unsigned int viu_poll(struct file *file, struct poll_table_struct *wait)
{
struct viu_fh *fh = file->private_data;
struct videobuf_queue *q = &fh->vb_vidq;
struct viu_dev *dev = fh->dev;
unsigned int res;
if (V4L2_BUF_TYPE_VIDEO_CAPTURE != fh->type)
return POLLERR;
return videobuf_poll_stream(file, q, wait);
mutex_lock(&dev->lock);
res = videobuf_poll_stream(file, q, wait);
mutex_unlock(&dev->lock);
return res;
}
static int viu_release(struct file *file)
@ -1365,9 +1380,11 @@ static int viu_release(struct file *file)
struct viu_dev *dev = fh->dev;
int minor = video_devdata(file)->minor;
mutex_lock(&dev->lock);
viu_stop_dma(dev);
videobuf_stop(&fh->vb_vidq);
videobuf_mmap_free(&fh->vb_vidq);
mutex_unlock(&dev->lock);
kfree(fh);
@ -1394,11 +1411,15 @@ void viu_reset(struct viu_reg *reg)
static int viu_mmap(struct file *file, struct vm_area_struct *vma)
{
struct viu_fh *fh = file->private_data;
struct viu_dev *dev = fh->dev;
int ret;
dprintk(1, "mmap called, vma=0x%08lx\n", (unsigned long)vma);
if (mutex_lock_interruptible(&dev->lock))
return -ERESTARTSYS;
ret = videobuf_mmap_mapper(&fh->vb_vidq, vma);
mutex_unlock(&dev->lock);
dprintk(1, "vma start=0x%08lx, size=%ld, ret=%d\n",
(unsigned long)vma->vm_start,
@ -1544,10 +1565,6 @@ static int __devinit viu_of_probe(struct platform_device *op)
/* initialize locks */
mutex_init(&viu_dev->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, &viu_dev->vdev->flags);
viu_dev->vdev->lock = &viu_dev->lock;
spin_lock_init(&viu_dev->slock);