linux-kernel - Re: [PATCH] dax: fix default return code of range

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Message-ID: <b685493f-98f5-9717-f88a-308e96440dcd@oracle.com>
Date:   Wed, 10 Feb 2021 18:18:35 +0000
From:   Joao Martins <joao.m.martins@...cle.com>
To:     Shiyang Ruan <ruansy.fnst@...fujitsu.com>
Cc:     linux-kernel@...r.kernel.org, linux-nvdimm@...ts.01.org,
        dan.j.williams@...el.com, vishal.l.verma@...el.com,
        dave.jiang@...el.com
Subject: Re: [PATCH] dax: fix default return code of range_parse()

On 1/26/21 2:13 AM, Shiyang Ruan wrote:
> The return value of range_parse() indicates the size when it is
> positive.  The error code should be negative.
> 
> Signed-off-by: Shiyang Ruan <ruansy.fnst@...fujitsu.com>

Reviewed-by: Joao Martins <joao.m.martins@...cle.com>

Although, FWIW, there was another patch exactly like this a couple
months ago, albeit it didn't get pulled for some reason:

https://lore.kernel.org/linux-nvdimm/20201026110425.136629-1-zhangqilong3@huawei.com/

> ---
>  drivers/dax/bus.c | 2 +-
>  1 file changed, 1 insertion(+), 1 deletion(-)
> 
> diff --git a/drivers/dax/bus.c b/drivers/dax/bus.c
> index 737b207c9e30..3003558c1a8b 100644
> --- a/drivers/dax/bus.c
> +++ b/drivers/dax/bus.c
> @@ -1038,7 +1038,7 @@ static ssize_t range_parse(const char *opt, size_t len, struct range *range)
>  {
>  	unsigned long long addr = 0;
>  	char *start, *end, *str;
> -	ssize_t rc = EINVAL;
> +	ssize_t rc = -EINVAL;
>  
>  	str = kstrdup(opt, GFP_KERNEL);
>  	if (!str)
>