On 08/09/2018 10:16 PM, Mauro Carvalho Chehab wrote:
> Em Sat, 4 Aug 2018 14:45:03 +0200
> Hans Verkuil <hverk...@xs4all.nl> escreveu:
>
>> From: Hans Verkuil <hans.verk...@cisco.com>
>>
>> Embed and initialize a media_request_object in struct v4l2_ctrl_handler.
>>
>> Add a p_req field to struct v4l2_ctrl_ref that will store the
>> request value.
>>
>> Signed-off-by: Hans Verkuil <hans.verk...@cisco.com>
>> Signed-off-by: Alexandre Courbot <acour...@chromium.org>
>
> Reviewed-by: Mauro Carvalho Chehab <mchehab+sams...@kernel.org>
>
>> ---
>> drivers/media/v4l2-core/v4l2-ctrls.c | 1 +
>> include/media/v4l2-ctrls.h | 10 ++++++++++
>> 2 files changed, 11 insertions(+)
>>
>> diff --git a/drivers/media/v4l2-core/v4l2-ctrls.c
>> b/drivers/media/v4l2-core/v4l2-ctrls.c
>> index 404291f00715..b33a8bee82b0 100644
>> --- a/drivers/media/v4l2-core/v4l2-ctrls.c
>> +++ b/drivers/media/v4l2-core/v4l2-ctrls.c
>> @@ -1901,6 +1901,7 @@ int v4l2_ctrl_handler_init_class(struct
>> v4l2_ctrl_handler *hdl,
>> sizeof(hdl->buckets[0]),
>> GFP_KERNEL | __GFP_ZERO);
>> hdl->error = hdl->buckets ? 0 : -ENOMEM;
>> + media_request_object_init(&hdl->req_obj);
>
> I don't like very much the idea of initializing it even when the
> request API won't work, e. g. :
>
> if (!mdev->ops || !mdev->ops->req_validate || !mdev->ops->req_queue)
>
> but I guess it would be too early to check it here, right?
Correct.
Regards,
Hans
>
>> return hdl->error;
>> }
>> EXPORT_SYMBOL(v4l2_ctrl_handler_init_class);
>> diff --git a/include/media/v4l2-ctrls.h b/include/media/v4l2-ctrls.h
>> index 192e31c21faf..3f4e062d4e3d 100644
>> --- a/include/media/v4l2-ctrls.h
>> +++ b/include/media/v4l2-ctrls.h
>> @@ -20,6 +20,7 @@
>> #include <linux/list.h>
>> #include <linux/mutex.h>
>> #include <linux/videodev2.h>
>> +#include <media/media-request.h>
>>
>> /* forward references */
>> struct file;
>> @@ -249,6 +250,11 @@ struct v4l2_ctrl {
>> * ``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
>> @@ -260,6 +266,7 @@ struct v4l2_ctrl_ref {
>> struct v4l2_ctrl *ctrl;
>> struct v4l2_ctrl_helper *helper;
>> bool from_other_dev;
>> + union v4l2_ctrl_ptr p_req;
>> };
>>
>> /**
>> @@ -283,6 +290,8 @@ struct v4l2_ctrl_ref {
>> * @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;
>> @@ -295,6 +304,7 @@ struct v4l2_ctrl_handler {
>> void *notify_priv;
>> u16 nr_of_buckets;
>> int error;
>> + struct media_request_object req_obj;
>> };
>>
>> /**
>
>
>
> Thanks,
> Mauro
>
