linux-kernel - Re: [PATCH v5 5/7] revocable: Add fops replacement

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Message-ID: <20251211080517.GA28411@pendragon.ideasonboard.com>
Date: Thu, 11 Dec 2025 17:05:17 +0900
From: Laurent Pinchart <laurent.pinchart@...asonboard.com>
To: Wolfram Sang <wsa+renesas@...g-engineering.com>
Cc: Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
	Jason Gunthorpe <jgg@...dia.com>,
	Tzung-Bi Shih <tzungbi@...nel.org>,
	Benson Leung <bleung@...omium.org>,
	"Rafael J . Wysocki" <rafael@...nel.org>,
	Danilo Krummrich <dakr@...nel.org>,
	Jonathan Corbet <corbet@....net>, Shuah Khan <shuah@...nel.org>,
	linux-doc@...r.kernel.org, linux-kernel@...r.kernel.org,
	chrome-platform@...ts.linux.dev, linux-kselftest@...r.kernel.org,
	Bartosz Golaszewski <brgl@...ev.pl>,
	Simona Vetter <simona.vetter@...ll.ch>,
	Dan Williams <dan.j.williams@...el.com>
Subject: Re: [PATCH v5 5/7] revocable: Add fops replacement

On Thu, Dec 11, 2025 at 12:47:16PM +0900, Wolfram Sang wrote:
> 
> > Replying late to this thread, I don't think this is right for V4L2. When
> > it comes to solving the .remove() vs. userspace race, I think the right
> > solution is at the cdev level.
> 
> Isn't there even prototype code from Dan Williams?
> 
> "[PATCH 1/3] cdev: Finish the cdev api with queued mode support"
> 
> https://lkml.org/lkml/2021/1/20/997

I mentioned that in my LPC talk in 2022 :-) I think we should merge that
(or a rebased, possibly improved version of it). I've meant to try
plumbing that series in V4L2 but couldn't find the time so far.

-- 
Regards,

Laurent Pinchart