linux-kernel - Re: [PATCH v2 1/4] gpio/aspeed: Fix incorrect number of banks

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Message-Id: <5f3ec58f-d83b-41f9-80ed-35a5434bb985@www.fastmail.com>
Date:   Thu, 05 Sep 2019 13:17:33 +0930
From:   "Andrew Jeffery" <andrew@...id.au>
To:     "Rashmica Gupta" <rashmica.g@...il.com>,
        "Linus Walleij" <linus.walleij@...aro.org>
Cc:     "Bartosz Golaszewski" <bgolaszewski@...libre.com>,
        "Joel Stanley" <joel@....id.au>, linux-gpio@...r.kernel.org,
        linux-arm-kernel@...ts.infradead.org,
        linux-aspeed@...ts.ozlabs.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH v2 1/4] gpio/aspeed: Fix incorrect number of banks



On Thu, 5 Sep 2019, at 10:46, Rashmica Gupta 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>

> ---
>  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
> 
>