media: v4l2-ctrls: prepare internal structs for request API

				      sizeof(hdl->buckets[0]),

				      GFP_KERNEL | __GFP_ZERO);

	hdl->error = hdl->buckets ? 0 : -ENOMEM;

	media_request_object_init(&hdl->req_obj);

	return hdl->error;

}

EXPORT_SYMBOL(v4l2_ctrl_handler_init_class);

#include <linux/list.h>

#include <linux/mutex.h>

#include <linux/videodev2.h>

#include <media/media-request.h>

/* forward references */

struct file;

 *		``prepare_ext_ctrls`` function at ``v4l2-ctrl.c``.

 * @from_other_dev: If true, then @ctrl was defined in another

 *		device than the &struct v4l2_ctrl_handler.

 * @p_req:	If the control handler containing this control reference

 *		is bound to a media request, then this points to the

 *		value of the control that should be applied when the request

 *		is executed, or to the value of the control at the time

 *		that the request was completed.

 *

 * Each control handler has a list of these refs. The list_head is used to

 * keep a sorted-by-control-ID list of all controls, while the next pointer

	struct v4l2_ctrl *ctrl;

	struct v4l2_ctrl_helper *helper;

	bool from_other_dev;

	union v4l2_ctrl_ptr p_req;

};

/**

 * @notify_priv: Passed as argument to the v4l2_ctrl notify callback.

 * @nr_of_buckets: Total number of buckets in the array.

 * @error:	The error code of the first failed control addition.

 * @req_obj:	The &struct media_request_object, used to link into a

 *		&struct media_request. This request object has a refcount.

 */

struct v4l2_ctrl_handler {

	struct mutex _lock;

	void *notify_priv;

	u16 nr_of_buckets;

	int error;

	struct media_request_object req_obj;

};

/**