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V4L/DVB (8782): v4l2-dev: add video_device_release_empty

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Add a second release function: video_device_release_empty
It can be used by drivers that have statically allocated
video_device structs.

Its use usually, but not always, indicates laziness on the
part of the driver programmer.

Signed-off-by: Hans Verkuil <hverkuil@xs4all.nl>
Signed-off-by: Mauro Carvalho Chehab <mchehab@redhat.com>
This commit is contained in:
Hans Verkuil 2008-08-23 05:47:41 -03:00 committed by Mauro Carvalho Chehab
parent cb353588e1
commit f9e86b5e9d
2 changed files with 12 additions and 0 deletions
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7
drivers/media/video/v4l2-dev.c
View File

@ -73,6 +73,13 @@ void video_device_release(struct video_device *vfd)
}
EXPORT_SYMBOL(video_device_release);
void video_device_release_empty(struct video_device *vfd)
{
/* Do nothing */
/* Only valid when the video_device struct is a static. */
}
EXPORT_SYMBOL(video_device_release_empty);
static void video_release(struct device *cd)
{
struct video_device *vfd = container_of(cd, struct video_device, dev);

5
include/media/v4l2-dev.h
View File

@ -91,7 +91,12 @@ void video_unregister_device(struct video_device *);
/* helper functions to alloc / release struct video_device, the
later can be used for video_device->release() */
struct video_device *video_device_alloc(void);
/* this release function frees the vfd pointer */
void video_device_release(struct video_device *vfd);
/* this release function does nothing, use when the video_device is a
static global struct. Note that having a static video_device is
a dubious construction at best. */
void video_device_release_empty(struct video_device *vfd);
#ifdef OBSOLETE_DEVDATA /* to be removed soon */
/* helper functions to access driver private data. */