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Message-ID: <1157542d-7088-fe70-965a-cfa128090bb3@xs4all.nl>
Date: Tue, 6 Jul 2021 16:18:37 +0200
From: Hans Verkuil <hverkuil-cisco@...all.nl>
To: Ricardo Ribalda <ribalda@...omium.org>
Cc: Hans Verkuil <hverkuil@...all.nl>,
Laurent Pinchart <laurent.pinchart@...asonboard.com>,
Mauro Carvalho Chehab <mchehab@...nel.org>,
linux-media@...r.kernel.org, tfiga@...omium.org,
Sergey Senozhatsky <sergey.senozhatsky@...il.com>,
linux-kernel@...r.kernel.org
Subject: Re: [PATCH v10 21/21] media: uvcvideo: Return -EACCES to inactive
controls
On 30/06/2021 14:51, Ricardo Ribalda wrote:
> Hi Hans
>
>
> On Wed, 30 Jun 2021 at 11:03, Hans Verkuil <hverkuil-cisco@...all.nl> wrote:
>>
>> Hi Ricardo,
>>
>> On 25/06/2021 15:55, Ricardo Ribalda wrote:
>>> Hi Hans
>>>
>>> On Fri, 25 Jun 2021 at 13:07, Hans Verkuil <hverkuil-cisco@...all.nl> wrote:
>>>>
>>>> On 25/06/2021 12:29, Ricardo Ribalda wrote:
>>>>> Hi Hans
>>>>>
>>>>> Did you have some hardware that did not work fine without this patch?
>>>>> Am I remembering correctly?
>>>>
>>>> Yes, that's correct. It's one of my webcams, but I can't remember which one
>>>> it is. You probably want me to test this v10?
>>>>
>>>> Regards,
>>>
>>> That would be awesome. Thanks!
>>
>> You can add my:
>>
>> Tested-by: Hans Verkuil <hverkuil-cisco@...all.nl>
>
> Thanks a lot for testing it!
>
> Sorry to bother you, but could I ask you to try again, but with this
> patch reverted? This is v10 1-20, without 21/21
I tried with and without this patch and I didn't see any difference. Unfortunately,
I don't remember the exact details of what I tested last time and with which hardware.
I would drop this patch, it can always be added later.
Regards,
Hans
>
>
> Thanks!
>>
>> to this series.
>>
>> I do get these warnings (depends on the webcam model, though, some do, some don't):
>>
>> Streaming ioctls:
>> test read/write: OK (Not Supported)
>> test blocking wait: OK
>> warn: v4l2-test-buffers.cpp(438): got sequence number 1, expected 0
>> test MMAP (no poll): OK
>> warn: v4l2-test-buffers.cpp(438): got sequence number 1, expected 0
>> test MMAP (select): OK
>> warn: v4l2-test-buffers.cpp(438): got sequence number 1, expected 0
>> test MMAP (epoll): OK
>> warn: v4l2-test-buffers.cpp(438): got sequence number 1, expected 0
>> test USERPTR (no poll): OK
>> warn: v4l2-test-buffers.cpp(438): got sequence number 1, expected 0
>> test USERPTR (select): OK
>> test DMABUF: Cannot test, specify --expbuf-device
>>
>> It's something to do with the Field ID, but I'm not sure if this is really correctly
>> reporting a dropped frame, or if it is a false report and the sequence counter was
>> wrongly incremented.
>>
>> This is a separate issue, though, and doesn't block this series.
>>
>> Regards,
>>
>> Hans
>>
>>>
>>>>
>>>> Hans
>>>>
>>>>>
>>>>> Thanks!
>>>>>
>>>>> On Fri, 18 Jun 2021 at 14:29, Ricardo Ribalda <ribalda@...omium.org> wrote:
>>>>>>
>>>>>> If a control is inactive return -EACCES to let the userspace know that
>>>>>> the value will not be applied automatically when the control is active
>>>>>> again.
>>>>>>
>>>>>> Also make sure that query_v4l2_ctrl doesn't return an error.
>>>>>>
>>>>>> Suggested-by: Hans Verkuil <hverkuil-cisco@...all.nl>
>>>>>> Reviewed-by: Hans Verkuil <hverkuil-cisco@...all.nl>
>>>>>> Signed-off-by: Ricardo Ribalda <ribalda@...omium.org>
>>>>>> ---
>>>>>> drivers/media/usb/uvc/uvc_ctrl.c | 73 +++++++++++++++++++++-----------
>>>>>> 1 file changed, 49 insertions(+), 24 deletions(-)
>>>>>>
>>>>>> diff --git a/drivers/media/usb/uvc/uvc_ctrl.c b/drivers/media/usb/uvc/uvc_ctrl.c
>>>>>> index da44d5c0b9ad..4f80c06d3c43 100644
>>>>>> --- a/drivers/media/usb/uvc/uvc_ctrl.c
>>>>>> +++ b/drivers/media/usb/uvc/uvc_ctrl.c
>>>>>> @@ -1104,13 +1104,36 @@ static const char *uvc_map_get_name(const struct uvc_control_mapping *map)
>>>>>> return "Unknown Control";
>>>>>> }
>>>>>>
>>>>>> +static bool uvc_ctrl_is_inactive(struct uvc_video_chain *chain,
>>>>>> + struct uvc_control *ctrl,
>>>>>> + struct uvc_control_mapping *mapping)
>>>>>> +{
>>>>>> + struct uvc_control_mapping *master_map = NULL;
>>>>>> + struct uvc_control *master_ctrl = NULL;
>>>>>> + s32 val;
>>>>>> + int ret;
>>>>>> +
>>>>>> + if (!mapping->master_id)
>>>>>> + return false;
>>>>>> +
>>>>>> + __uvc_find_control(ctrl->entity, mapping->master_id, &master_map,
>>>>>> + &master_ctrl, 0);
>>>>>> +
>>>>>> + if (!master_ctrl || !(master_ctrl->info.flags & UVC_CTRL_FLAG_GET_CUR))
>>>>>> + return false;
>>>>>> +
>>>>>> + ret = __uvc_ctrl_get(chain, master_ctrl, master_map, &val);
>>>>>> + if (ret < 0 || val == mapping->master_manual)
>>>>>> + return false;
>>>>>> +
>>>>>> + return true;
>>>>>> +}
>>>>>> +
>>>>>> static int __uvc_query_v4l2_ctrl(struct uvc_video_chain *chain,
>>>>>> struct uvc_control *ctrl,
>>>>>> struct uvc_control_mapping *mapping,
>>>>>> struct v4l2_queryctrl *v4l2_ctrl)
>>>>>> {
>>>>>> - struct uvc_control_mapping *master_map = NULL;
>>>>>> - struct uvc_control *master_ctrl = NULL;
>>>>>> const struct uvc_menu_info *menu;
>>>>>> unsigned int i;
>>>>>>
>>>>>> @@ -1126,18 +1149,8 @@ static int __uvc_query_v4l2_ctrl(struct uvc_video_chain *chain,
>>>>>> if (!(ctrl->info.flags & UVC_CTRL_FLAG_SET_CUR))
>>>>>> v4l2_ctrl->flags |= V4L2_CTRL_FLAG_READ_ONLY;
>>>>>>
>>>>>> - if (mapping->master_id)
>>>>>> - __uvc_find_control(ctrl->entity, mapping->master_id,
>>>>>> - &master_map, &master_ctrl, 0);
>>>>>> - if (master_ctrl && (master_ctrl->info.flags & UVC_CTRL_FLAG_GET_CUR)) {
>>>>>> - s32 val;
>>>>>> - int ret = __uvc_ctrl_get(chain, master_ctrl, master_map, &val);
>>>>>> - if (ret < 0)
>>>>>> - return ret;
>>>>>> -
>>>>>> - if (val != mapping->master_manual)
>>>>>> - v4l2_ctrl->flags |= V4L2_CTRL_FLAG_INACTIVE;
>>>>>> - }
>>>>>> + if (uvc_ctrl_is_inactive(chain, ctrl, mapping))
>>>>>> + v4l2_ctrl->flags |= V4L2_CTRL_FLAG_INACTIVE;
>>>>>>
>>>>>> if (!ctrl->cached) {
>>>>>> int ret = uvc_ctrl_populate_cache(chain, ctrl);
>>>>>> @@ -1660,25 +1673,37 @@ static int uvc_ctrl_commit_entity(struct uvc_device *dev,
>>>>>> return 0;
>>>>>> }
>>>>>>
>>>>>> -static int uvc_ctrl_find_ctrl_idx(struct uvc_entity *entity,
>>>>>> - struct v4l2_ext_controls *ctrls,
>>>>>> - struct uvc_control *uvc_control)
>>>>>> +static int uvc_ctrl_commit_error(struct uvc_video_chain *chain,
>>>>>> + struct uvc_entity *entity,
>>>>>> + struct v4l2_ext_controls *ctrls,
>>>>>> + struct uvc_control *err_control,
>>>>>> + int ret)
>>>>>> {
>>>>>> struct uvc_control_mapping *mapping;
>>>>>> struct uvc_control *ctrl_found;
>>>>>> unsigned int i;
>>>>>>
>>>>>> - if (!entity)
>>>>>> - return ctrls->count;
>>>>>> + if (!entity) {
>>>>>> + ctrls->error_idx = ctrls->count;
>>>>>> + return ret;
>>>>>> + }
>>>>>>
>>>>>> for (i = 0; i < ctrls->count; i++) {
>>>>>> __uvc_find_control(entity, ctrls->controls[i].id, &mapping,
>>>>>> &ctrl_found, 0);
>>>>>> - if (uvc_control == ctrl_found)
>>>>>> - return i;
>>>>>> + if (err_control == ctrl_found)
>>>>>> + break;
>>>>>> }
>>>>>> + ctrls->error_idx = i;
>>>>>> +
>>>>>> + /* We could not find the control that failed. */
>>>>>> + if (i == ctrls->count)
>>>>>> + return ret;
>>>>>> +
>>>>>> + if (uvc_ctrl_is_inactive(chain, err_control, mapping))
>>>>>> + return -EACCES;
>>>>>>
>>>>>> - return ctrls->count;
>>>>>> + return ret;
>>>>>> }
>>>>>>
>>>>>> int __uvc_ctrl_commit(struct uvc_fh *handle, int rollback,
>>>>>> @@ -1701,8 +1726,8 @@ int __uvc_ctrl_commit(struct uvc_fh *handle, int rollback,
>>>>>> uvc_ctrl_send_events(handle, ctrls->controls, ctrls->count);
>>>>>> done:
>>>>>> if (ret < 0 && ctrls)
>>>>>> - ctrls->error_idx = uvc_ctrl_find_ctrl_idx(entity, ctrls,
>>>>>> - err_ctrl);
>>>>>> + ret = uvc_ctrl_commit_error(chain, entity, ctrls, err_ctrl,
>>>>>> + ret);
>>>>>> mutex_unlock(&chain->ctrl_mutex);
>>>>>> return ret;
>>>>>> }
>>>>>> --
>>>>>> 2.32.0.288.g62a8d224e6-goog
>>>>>>
>>>>>
>>>>>
>>>>
>>>
>>>
>>
>
>
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