linux-kernel - Re: [PATCH v3 2/5] gpio/aspeed: Fix incorrect number of banks

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Message-ID: <CACPK8XeAohB1qZsWHaxa0zEJM5jVhvV6PSj0fKajobC5HYbMtg@mail.gmail.com>
Date:   Fri, 6 Sep 2019 19:46:18 +0000
From:   Joel Stanley <joel@....id.au>
To:     Rashmica Gupta <rashmica.g@...il.com>
Cc:     Linus Walleij <linus.walleij@...aro.org>,
        Andrew Jeffery <andrew@...id.au>,
        Bartosz Golaszewski <bgolaszewski@...libre.com>,
        "open list:GPIO SUBSYSTEM" <linux-gpio@...r.kernel.org>,
        "moderated list:ARM/ASPEED MACHINE SUPPORT" 
        <linux-arm-kernel@...ts.infradead.org>,
        "moderated list:ARM/ASPEED MACHINE SUPPORT" 
        <linux-aspeed@...ts.ozlabs.org>,
        open list <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH v3 2/5] gpio/aspeed: Fix incorrect number of banks

On Fri, 6 Sep 2019 at 06:26, Rashmica Gupta <rashmica.g@...il.com> wrote:
>
> The current calculation for the number of GPIO banks is only correct if
> the number of GPIOs is a multiple of 32 (if there were 31 GPIOs we would
> currently say there are 0 banks, which is incorrect).
>
> Fixes: 361b79119a4b7 ('gpio: Add Aspeed driver')
>
> Signed-off-by: Rashmica Gupta <rashmica.g@...il.com>
> Reviewed-by: Andrew Jeffery <andrew@...id.au>

Reviewed-by: Joel Stanley <joel@....d.au>

> ---
>  drivers/gpio/gpio-aspeed.c | 2 +-
>  1 file changed, 1 insertion(+), 1 deletion(-)
>
> diff --git a/drivers/gpio/gpio-aspeed.c b/drivers/gpio/gpio-aspeed.c
> index 9defe25d4721..b83e23aecd18 100644
> --- a/drivers/gpio/gpio-aspeed.c
> +++ b/drivers/gpio/gpio-aspeed.c
> @@ -1165,7 +1165,7 @@ static int __init aspeed_gpio_probe(struct platform_device *pdev)
>         gpio->chip.base = -1;
>
>         /* Allocate a cache of the output registers */
> -       banks = gpio->config->nr_gpios >> 5;
> +       banks = DIV_ROUND_UP(gpio->config->nr_gpios, 32);
>         gpio->dcache = devm_kcalloc(&pdev->dev,
>                                     banks, sizeof(u32), GFP_KERNEL);
>         if (!gpio->dcache)
> --
> 2.20.1
>