linux-kernel - Re: [PATCH RESEND] gpio: regmap: use new regmap_might

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [day] [month] [year] [list]

Message-ID: <CAMRc=McEin9uXOFEeB1=oDKmUTu+hvKoaUGjCx-7Prc7RXubJw@mail.gmail.com>
Date:   Fri, 6 Jan 2023 14:14:26 +0100
From:   Bartosz Golaszewski <brgl@...ev.pl>
To:     Michael Walle <michael@...le.cc>
Cc:     Linus Walleij <linus.walleij@...aro.org>,
        linux-gpio@...r.kernel.org, linux-kernel@...r.kernel.org,
        William Breathitt Gray <william.gray@...aro.org>
Subject: Re: [PATCH RESEND] gpio: regmap: use new regmap_might_sleep()

On Thu, Jan 5, 2023 at 4:06 PM Michael Walle <michael@...le.cc> wrote:
>
> Now that the regmap can be queried whether it might sleep, we can get
> rid of the conservative setting "can_sleep = true". New drivers which
> want to use gpio-regmap and can access the registers memory-mapped won't
> have the restriction that their consumers have to use the
> gpiod_*cansleep() variants anymore.
>
> Signed-off-by: Michael Walle <michael@...le.cc>
> ---
>  drivers/gpio/gpio-regmap.c | 10 +---------
>  1 file changed, 1 insertion(+), 9 deletions(-)
>
> diff --git a/drivers/gpio/gpio-regmap.c b/drivers/gpio/gpio-regmap.c
> index f907c9c19fce..fca17d478984 100644
> --- a/drivers/gpio/gpio-regmap.c
> +++ b/drivers/gpio/gpio-regmap.c
> @@ -254,15 +254,7 @@ struct gpio_regmap *gpio_regmap_register(const struct gpio_regmap_config *config
>         chip->ngpio = config->ngpio;
>         chip->names = config->names;
>         chip->label = config->label ?: dev_name(config->parent);
> -
> -       /*
> -        * If our regmap is fast_io we should probably set can_sleep to false.
> -        * Right now, the regmap doesn't save this property, nor is there any
> -        * access function for it.
> -        * The only regmap type which uses fast_io is regmap-mmio. For now,
> -        * assume a safe default of true here.
> -        */
> -       chip->can_sleep = true;
> +       chip->can_sleep = regmap_might_sleep(config->regmap);
>
>         chip->get = gpio_regmap_get;
>         if (gpio->reg_set_base && gpio->reg_clr_base)
> --
> 2.30.2
>

Applied, thanks!

Bart