linux-kernel - Re: [PATCH] gpiolib: Drop cargo-culted comment

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Message-ID: <CACRpkdZvwePEaRVQLafD8KmiOENgEGFFDBXGPqS5_WLzNi2_yA@mail.gmail.com>
Date:   Sun, 26 Nov 2023 00:05:08 +0100
From:   Linus Walleij <linus.walleij@...aro.org>
To:     Kent Gibson <warthog618@...il.com>
Cc:     Bartosz Golaszewski <brgl@...ev.pl>,
        Andy Shevchenko <andy@...nel.org>, linux-gpio@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH] gpiolib: Drop cargo-culted comment

On Sat, Nov 25, 2023 at 3:40 AM Kent Gibson <warthog618@...il.com> wrote:
> On Sat, Nov 25, 2023 at 12:25:47AM +0100, Linus Walleij wrote:

> > -/* gpio_lock prevents conflicts during gpio_desc[] table updates.
> > - * While any GPIO is requested, its gpio_chip is not removable;
> > - * each GPIO's "requested" flag serves as a lock and refcount.
> > - */
>
> Perhaps provide a comment as to what the gpio_lock DOES cover?

Normally yes, but Bartosz just said he is going to replace this spinlock
with a mutex so it's better if he adds it then.

Yours,
Linus Walleij