linux-kernel - Re: [PATCH v2] net: dsa: use DEVICE_ATTR_RW to declare temp1

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Message-ID: <20150417194006.GA9538@roeck-us.net>
Date:	Fri, 17 Apr 2015 12:40:06 -0700
From:	Guenter Roeck <linux@...ck-us.net>
To:	Vivien Didelot <vivien.didelot@...oirfairelinux.com>
Cc:	netdev@...r.kernel.org, "David S. Miller" <davem@...emloft.net>,
	linux-kernel@...r.kernel.org, kernel@...oirfairelinux.com
Subject: Re: [PATCH v2] net: dsa: use DEVICE_ATTR_RW to declare temp1_max

On Fri, Apr 17, 2015 at 03:12:25PM -0400, Vivien Didelot wrote:
> Since commit da4759c (sysfs: Use only return value from is_visible for
> the file mode), it is possible to reduce the permissions of a file.
> 
> So declare temp1_max with the DEVICE_ATTR_RW macro and remove the write
> permission in dsa_hwmon_attrs_visible if set_temp_limit isn't provided.
> 
> Signed-off-by: Vivien Didelot <vivien.didelot@...oirfairelinux.com>

Looks good.

Reviewed-by: Guenter Roeck <linux@...ck-us.net>

> ---
>  net/dsa/dsa.c | 6 +++---
>  1 file changed, 3 insertions(+), 3 deletions(-)
> 
> diff --git a/net/dsa/dsa.c b/net/dsa/dsa.c
> index 5eaadab..079a224 100644
> --- a/net/dsa/dsa.c
> +++ b/net/dsa/dsa.c
> @@ -124,7 +124,7 @@ static ssize_t temp1_max_store(struct device *dev,
>  
>  	return count;
>  }
> -static DEVICE_ATTR(temp1_max, S_IRUGO, temp1_max_show, temp1_max_store);
> +static DEVICE_ATTR_RW(temp1_max);
>  
>  static ssize_t temp1_max_alarm_show(struct device *dev,
>  				    struct device_attribute *attr, char *buf)
> @@ -159,8 +159,8 @@ static umode_t dsa_hwmon_attrs_visible(struct kobject *kobj,
>  	if (index == 1) {
>  		if (!drv->get_temp_limit)
>  			mode = 0;
> -		else if (drv->set_temp_limit)
> -			mode |= S_IWUSR;
> +		else if (!drv->set_temp_limit)
> +			mode &= ~S_IWUSR;
>  	} else if (index == 2 && !drv->get_temp_alarm) {
>  		mode = 0;
>  	}
> -- 
> 2.3.5
> 
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