linux-kernel - Re: [PATCH 3/7] staging: ks7010: Remove unnecessary limit checks

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Message-ID: <20180514131736.ysftvs3nk552kjnx@mwanda>
Date:   Mon, 14 May 2018 16:17:36 +0300
From:   Dan Carpenter <dan.carpenter@...cle.com>
To:     Nathan Chancellor <natechancellor@...il.com>
Cc:     devel@...verdev.osuosl.org,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH 3/7] staging: ks7010: Remove unnecessary limit checks

On Sun, May 06, 2018 at 03:03:00PM -0700, Nathan Chancellor wrote:
> uwrq is an unsigned 32-bit integer, it cannot be less than zero.
> 
> Signed-off-by: Nathan Chancellor <natechancellor@...il.com>
> ---
>  drivers/staging/ks7010/ks_wlan_net.c | 6 +++---
>  1 file changed, 3 insertions(+), 3 deletions(-)
> 
> diff --git a/drivers/staging/ks7010/ks_wlan_net.c b/drivers/staging/ks7010/ks_wlan_net.c
> index e96477937f65..0c83d6fe270f 100644
> --- a/drivers/staging/ks7010/ks_wlan_net.c
> +++ b/drivers/staging/ks7010/ks_wlan_net.c
> @@ -1928,7 +1928,7 @@ static int ks_wlan_set_beacon_lost(struct net_device *dev,
>  	if (priv->sleep_mode == SLP_SLEEP)
>  		return -EPERM;
>  	/* for SLEEP MODE */
> -	if (*uwrq < BEACON_LOST_COUNT_MIN || *uwrq > BEACON_LOST_COUNT_MAX)
> +	if (*uwrq > BEACON_LOST_COUNT_MAX)

I believe Smatch is supposed to ignore this sort of code because
comparing "if (foo < 0 || foo > max) " is pretty readable and idiomatic.

Presumably this was so we could redefine BEACON_LOST_COUNT_MIN, but it's
fine to unused code.  The define isn't needed at all, so you can
delete that as well.

regards,
dan carpenter