linux-kernel - Re: [PATCH v6 0/5] media: uvcvideo: Two +1 fixes for async controls

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Message-ID: <f0e267be-70ab-4323-8c67-8f28201a1696@redhat.com>
Date: Thu, 19 Dec 2024 10:27:10 +0100
From: Hans de Goede <hdegoede@...hat.com>
To: Laurent Pinchart <laurent.pinchart@...asonboard.com>
Cc: Ricardo Ribalda <ribalda@...omium.org>,
 Mauro Carvalho Chehab <mchehab@...nel.org>,
 Guennadi Liakhovetski <guennadi.liakhovetski@...el.com>,
 Hans Verkuil <hverkuil@...all.nl>,
 Mauro Carvalho Chehab <mchehab+samsung@...nel.org>,
 linux-media@...r.kernel.org, linux-kernel@...r.kernel.org,
 stable@...r.kernel.org
Subject: Re: [PATCH v6 0/5] media: uvcvideo: Two +1 fixes for async controls

Hi,

On 19-Dec-24 1:37 AM, Laurent Pinchart wrote:
> On Mon, Dec 09, 2024 at 12:01:16PM +0100, Hans de Goede wrote:
>> Hi,
>>
>> On 3-Dec-24 10:20 PM, Ricardo Ribalda wrote:
>>> This patchset fixes two +1 bugs with the async controls for the uvc driver.
>>>
>>> They were found while implementing the granular PM, but I am sending
>>> them as a separate patches, so they can be reviewed sooner. They fix
>>> real issues in the driver that need to be taken care.
>>>
>>> Signed-off-by: Ricardo Ribalda <ribalda@...omium.org>
>>
>> Ricardo, Thank you for your patches.
>>
>> I have merged patches 1-4 into:
>>
>> https://gitlab.freedesktop.org/linux-media/users/uvc/-/commits/next/
> 
> At least patch 5/5 was applied incorrectly. Does that result from a
> merge conflict ? Or did you apply v5 by mistake ? There doesn't seem to
> be any other issue.

I think I applied v5 by mistake, sorry about that.

> I've rebased the uvc/next branch to fix this. Once CI passes, I'll send
> a pull request.

Great, thank you.

Regards,

Hans



>>> ---
>>> Changes in v6:
>>> - Swap order of patches
>>> - Use uvc_ctrl_set_handle again
>>> - Move loaded=0 to uvc_ctrl_status_event()
>>> - Link to v5: https://lore.kernel.org/r/20241202-uvc-fix-async-v5-0-6658c1fe312b@chromium.org
>>>
>>> Changes in v5:
>>> - Move set handle to the entity_commit
>>> - Replace uvc_ctrl_set_handle with get/put_handle.
>>> - Add a patch to flush the cache of async controls.
>>> - Link to v4: https://lore.kernel.org/r/20241129-uvc-fix-async-v4-0-f23784dba80f@chromium.org
>>>
>>> Changes in v4:
>>> - Fix implementation of uvc_ctrl_set_handle.
>>> - Link to v3: https://lore.kernel.org/r/20241129-uvc-fix-async-v3-0-ab675ce66db7@chromium.org
>>>
>>> Changes in v3:
>>> - change again! order of patches.
>>> - Introduce uvc_ctrl_set_handle.
>>> - Do not change ctrl->handle if it is not NULL.
>>>
>>> Changes in v2:
>>> - Annotate lockdep
>>> - ctrl->handle != handle
>>> - Change order of patches
>>> - Move documentation of mutex
>>> - Link to v1: https://lore.kernel.org/r/20241127-uvc-fix-async-v1-0-eb8722531b8c@chromium.org
>>>
>>> ---
>>> Ricardo Ribalda (5):
>>>       media: uvcvideo: Only save async fh if success
>>>       media: uvcvideo: Remove redundant NULL assignment
>>>       media: uvcvideo: Remove dangling pointers
>>>       media: uvcvideo: Annotate lock requirements for uvc_ctrl_set
>>>       media: uvcvideo: Flush the control cache when we get an event
>>>
>>>  drivers/media/usb/uvc/uvc_ctrl.c | 83 ++++++++++++++++++++++++++++++++++------
>>>  drivers/media/usb/uvc/uvc_v4l2.c |  2 +
>>>  drivers/media/usb/uvc/uvcvideo.h |  9 ++++-
>>>  3 files changed, 82 insertions(+), 12 deletions(-)
>>> ---
>>> base-commit: 291a8d98186f0a704cb954855d2ae3233971f07d
>>> change-id: 20241127-uvc-fix-async-2c9d40413ad8
>