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

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Message-ID: <20241219003708.GK5518@pendragon.ideasonboard.com>
Date: Thu, 19 Dec 2024 02:37:08 +0200
From: Laurent Pinchart <laurent.pinchart@...asonboard.com>
To: Hans de Goede <hdegoede@...hat.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

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

> > ---
> > 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

-- 
Regards,

Laurent Pinchart