linux-kernel - Re: [PATCH v2 1/3] gpio: mpsse: use rcu to ensure worker is torn down

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Message-ID: <CACRpkdZ6_YkUsCNRFfRM1v68fpvAJcdqPRtAKTGqLqHf1geJog@mail.gmail.com>
Date: Wed, 1 Oct 2025 09:15:14 +0200
From: Linus Walleij <linus.walleij@...aro.org>
To: Mary Strodl <mstrodl@....rit.edu>
Cc: linux-kernel@...r.kernel.org, brgl@...ev.pl, linux-gpio@...r.kernel.org, 
	"Paul E. McKenney" <paulmck@...nel.org>, Tzung-Bi Shih <tzungbi@...nel.org>
Subject: Re: [PATCH v2 1/3] gpio: mpsse: use rcu to ensure worker is torn down

On Tue, Sep 23, 2025 at 3:35 PM Mary Strodl <mstrodl@....rit.edu> wrote:

> When an IRQ worker is running, unplugging the device would cause a
> crash. The sealevel hardware this driver was written for was not
> hotpluggable, so I never realized it.
>
> This change uses RCU to create a list of workers, which it tears down on
> disconnect.
>
> Signed-off-by: Mary Strodl <mstrodl@....rit.edu>

Oh this RCU thing is a bit terse and a lot of code.

Can you look if you can use the new revocable resource
management API? It uses RCU underneath.
https://lwn.net/Articles/1038523/

Yours,
Linus Walleij