linux-kernel - Re: [PATCH] ipw2200: Fix permissions setted by DEVICE

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Message-ID: <Yj4aCUlGY12VvuI/@lunn.ch>
Date:   Fri, 25 Mar 2022 20:37:45 +0100
From:   Andrew Lunn <andrew@...n.ch>
To:     Meng Tang <tangmeng@...ontech.com>
Cc:     stas.yakovlev@...il.com, kvalo@...nel.org, kuba@...nel.org,
        pabeni@...hat.com, linux-wireless@...r.kernel.org,
        netdev@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] ipw2200: Fix permissions setted by DEVICE_ATTR

On Fri, Mar 25, 2022 at 03:41:41PM +0800, Meng Tang wrote:
> Because xcode_version and rtc only implement the show function
> and do not provide the store function, so ucode_version and rtc
> only need the read permission, not need the write permission more.
> 
> So, remove the write permission from xcode_version and rtc.
> 
> Signed-off-by: Meng Tang <tangmeng@...ontech.com>
> ---
>  drivers/net/wireless/intel/ipw2x00/ipw2200.c | 4 ++--
>  1 file changed, 2 insertions(+), 2 deletions(-)
> 
> diff --git a/drivers/net/wireless/intel/ipw2x00/ipw2200.c b/drivers/net/wireless/intel/ipw2x00/ipw2200.c
> index 6830e88c4ed6..fa4f38d54d0a 100644
> --- a/drivers/net/wireless/intel/ipw2x00/ipw2200.c
> +++ b/drivers/net/wireless/intel/ipw2x00/ipw2200.c
> @@ -1578,7 +1578,7 @@ static ssize_t show_ucode_version(struct device *d,
>  	return sprintf(buf, "0x%08x\n", tmp);
>  }
>  
> -static DEVICE_ATTR(ucode_version, 0644, show_ucode_version, NULL);
> +static DEVICE_ATTR(ucode_version, 0444, show_ucode_version, NULL);

DEVICE_ATTR_RO() exists to make this more obvious. But it looks like
you would need to rename the show_ucode_version() to
ucode_version_show() in order to use it.

     Andrew