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media: videobuf2-v4l2: add vb2_request_queue/validate helpers

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The generic vb2_request_validate helper function checks if
there are buffers in the request and if so, prepares (validates)
all objects in the request.

The generic vb2_request_queue helper function queues all buffer
objects in the validated request.

Signed-off-by: Hans Verkuil <hans.verkuil@cisco.com>
Reviewed-by: Mauro Carvalho Chehab <mchehab+samsung@kernel.org>
Signed-off-by: Mauro Carvalho Chehab <mchehab+samsung@kernel.org>
This commit is contained in:
Hans Verkuil 2018-05-21 04:54:52 -04:00 committed by Mauro Carvalho Chehab
parent c07aa48ec5
commit 86f6bd3cf1
2 changed files with 55 additions and 0 deletions
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51
drivers/media/common/videobuf2/videobuf2-v4l2.c
View file

@ -1100,6 +1100,57 @@ void vb2_ops_wait_finish(struct vb2_queue *vq)
}
EXPORT_SYMBOL_GPL(vb2_ops_wait_finish);
/*
* Note that this function is called during validation time and
* thus the req_queue_mutex is held to ensure no request objects
* can be added or deleted while validating. So there is no need
* to protect the objects list.
*/
int vb2_request_validate(struct media_request *req)
{
struct media_request_object *obj;
int ret = 0;
if (!vb2_request_has_buffers(req))
return -ENOENT;
list_for_each_entry(obj, &req->objects, list) {
if (!obj->ops->prepare)
continue;
ret = obj->ops->prepare(obj);
if (ret)
break;
}
if (ret) {
list_for_each_entry_continue_reverse(obj, &req->objects, list)
if (obj->ops->unprepare)
obj->ops->unprepare(obj);
return ret;
}
return 0;
}
EXPORT_SYMBOL_GPL(vb2_request_validate);
void vb2_request_queue(struct media_request *req)
{
struct media_request_object *obj, *obj_safe;
/*
* Queue all objects. Note that buffer objects are at the end of the
* objects list, after all other object types. Once buffer objects
* are queued, the driver might delete them immediately (if the driver
* processes the buffer at once), so we have to use
* list_for_each_entry_safe() to handle the case where the object we
* queue is deleted.
*/
list_for_each_entry_safe(obj, obj_safe, &req->objects, list)
if (obj->ops->queue)
obj->ops->queue(obj);
}
EXPORT_SYMBOL_GPL(vb2_request_queue);
MODULE_DESCRIPTION("Driver helper framework for Video for Linux 2");
MODULE_AUTHOR("Pawel Osciak <pawel@osciak.com>, Marek Szyprowski");
MODULE_LICENSE("GPL");

4
include/media/videobuf2-v4l2.h
View file

@ -303,4 +303,8 @@ void vb2_ops_wait_prepare(struct vb2_queue *vq);
*/
void vb2_ops_wait_finish(struct vb2_queue *vq);
struct media_request;
int vb2_request_validate(struct media_request *req);
void vb2_request_queue(struct media_request *req);
#endif /* _MEDIA_VIDEOBUF2_V4L2_H */