Re: [PATCH 02/22] gpio: of: assign and read the hog pointer atomically

[Linus Walleij <linus.walleij@xxxxxxxxxx>]

On Tue, Jan 30, 2024 at 1:48 PM Bartosz Golaszewski <brgl@xxxxxxxx> wrote:

> From: Bartosz Golaszewski <bartosz.golaszewski@xxxxxxxxxx>
>
> The device nodes representing GPIO hogs cannot be deleted without
> unregistering the GPIO chip so there's no need to serialize their access.
> However we must ensure that users can get the right address so write and
> read it atomically.
>
> Signed-off-by: Bartosz Golaszewski <bartosz.golaszewski@xxxxxxxxxx>

So this would give barriers around desc->hog, so we are talking
SMP where the same hogs are added and removed on different
CPUs here I suppose? Seems a bit theoretical but OK.
Reviewed-by: Linus Walleij <linus.walleij@xxxxxxxxxx>

Yours,
Linus Walleij