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media: videobuf2-core: add request helper functions 

Add a new helper function to tell if a request object is a buffer.

Add a new helper function that returns true if a media_request
contains at least one buffer.

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 04:54:51 -04:00 committed by Mauro Carvalho Chehab
parent 394dc58880
commit c07aa48ec5
2 changed files with 39 additions and 0 deletions
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24
drivers/media/common/videobuf2/videobuf2-core.c
View File

@ -1362,6 +1362,30 @@ static const struct media_request_object_ops vb2_core_req_ops = {
.release = vb2_req_release,
};
bool vb2_request_object_is_buffer(struct media_request_object *obj)
{
return obj->ops == &vb2_core_req_ops;
}
EXPORT_SYMBOL_GPL(vb2_request_object_is_buffer);
bool vb2_request_has_buffers(struct media_request *req)
{
struct media_request_object *obj;
unsigned long flags;
bool has_buffers = false;
spin_lock_irqsave(&req->lock, flags);
list_for_each_entry(obj, &req->objects, list) {
if (vb2_request_object_is_buffer(obj)) {
has_buffers = true;
break;
}
}
spin_unlock_irqrestore(&req->lock, flags);
return has_buffers;
}
EXPORT_SYMBOL_GPL(vb2_request_has_buffers);
int vb2_core_prepare_buf(struct vb2_queue *q, unsigned int index, void *pb)
{
struct vb2_buffer *vb;

15
include/media/videobuf2-core.h
View File

@ -1172,4 +1172,19 @@ bool vb2_buffer_in_use(struct vb2_queue *q, struct vb2_buffer *vb);
*/
int vb2_verify_memory_type(struct vb2_queue *q,
enum vb2_memory memory, unsigned int type);
/**
* vb2_request_object_is_buffer() - return true if the object is a buffer
*
* @obj: the request object.
*/
bool vb2_request_object_is_buffer(struct media_request_object *obj);
/**
* vb2_request_has_buffers() - return true if the request contains buffers
*
* @req: the request.
*/
bool vb2_request_has_buffers(struct media_request *req);
#endif /* _MEDIA_VIDEOBUF2_CORE_H */