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[media] uvc: embed video_device 

Embed the video_device struct to simplify the error handling and in
order to (eventually) get rid of video_device_alloc/release.

Signed-off-by: Hans Verkuil <hans.verkuil@cisco.com>
Cc: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
Signed-off-by: Mauro Carvalho Chehab <mchehab@osg.samsung.com>
This commit is contained in:
Hans Verkuil 2015-03-09 13:34:11 -03:00 committed by Mauro Carvalho Chehab
parent d4352f3639
commit d8da7513bc
3 changed files with 6 additions and 20 deletions
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22
drivers/media/usb/uvc/uvc_driver.c
View File

@ -1669,10 +1669,6 @@ static void uvc_delete(struct uvc_device *dev)
#ifdef CONFIG_MEDIA_CONTROLLER
uvc_mc_cleanup_entity(entity);
#endif
if (entity->vdev) {
video_device_release(entity->vdev);
entity->vdev = NULL;
}
kfree(entity);
}
@ -1717,11 +1713,10 @@ static void uvc_unregister_video(struct uvc_device *dev)
atomic_inc(&dev->nstreams);
list_for_each_entry(stream, &dev->streams, list) {
if (stream->vdev == NULL)
if (!video_is_registered(&stream->vdev))
continue;
video_unregister_device(stream->vdev);
stream->vdev = NULL;
video_unregister_device(&stream->vdev);
uvc_debugfs_cleanup_stream(stream);
}
@ -1736,7 +1731,7 @@ static void uvc_unregister_video(struct uvc_device *dev)
static int uvc_register_video(struct uvc_device *dev,
struct uvc_streaming *stream)
{
struct video_device *vdev;
struct video_device *vdev = &stream->vdev;
int ret;
/* Initialize the video buffers queue. */
@ -1757,12 +1752,6 @@ static int uvc_register_video(struct uvc_device *dev,
uvc_debugfs_init_stream(stream);
/* Register the device with V4L. */
vdev = video_device_alloc();
if (vdev == NULL) {
uvc_printk(KERN_ERR, "Failed to allocate video device (%d).\n",
ret);
return -ENOMEM;
}
/* We already hold a reference to dev->udev. The video device will be
* unregistered before the reference is released, so we don't need to
@ -1780,15 +1769,12 @@ static int uvc_register_video(struct uvc_device *dev,
/* Set the driver data before calling video_register_device, otherwise
* uvc_v4l2_open might race us.
*/
stream->vdev = vdev;
video_set_drvdata(vdev, stream);
ret = video_register_device(vdev, VFL_TYPE_GRABBER, -1);
if (ret < 0) {
uvc_printk(KERN_ERR, "Failed to register video device (%d).\n",
ret);
stream->vdev = NULL;
video_device_release(vdev);
return ret;
}
@ -1827,7 +1813,7 @@ static int uvc_register_terms(struct uvc_device *dev,
if (ret < 0)
return ret;
term->vdev = stream->vdev;
term->vdev = &stream->vdev;
}
return 0;

2
drivers/media/usb/uvc/uvc_v4l2.c
View File

@ -511,7 +511,7 @@ static int uvc_v4l2_open(struct file *file)
stream->dev->users++;
mutex_unlock(&stream->dev->lock);
v4l2_fh_init(&handle->vfh, stream->vdev);
v4l2_fh_init(&handle->vfh, &stream->vdev);
v4l2_fh_add(&handle->vfh);
handle->chain = stream->chain;
handle->stream = stream;

2
drivers/media/usb/uvc/uvcvideo.h
View File

@ -443,7 +443,7 @@ struct uvc_stats_stream {
struct uvc_streaming {
struct list_head list;
struct uvc_device *dev;
struct video_device *vdev;
struct video_device vdev;
struct uvc_video_chain *chain;
atomic_t active;