linux-kernel - Re: [PATCH] usb: misc: remove unnecessary code

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Date:   Tue, 21 Feb 2017 23:11:28 +0100
From:   Peter Senna Tschudin <peter.senna@...il.com>
To:     "Gustavo A. R. Silva" <garsilva@...eddedor.com>
Cc:     gregkh@...uxfoundation.org, wsa-dev@...g-engineering.com,
        tj@...nel.org, bhaktipriya96@...il.com, linux-usb@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH] usb: misc: remove unnecessary code

On Mon, Feb 20, 2017 at 05:28:46PM -0600, Gustavo A. R. Silva wrote:
> 'val' is an unsigned variable, and less-than-zero comparison of an unsigned
> variable is never true.

I would add that val is set by kstrtoul() that converts a string to an
unsigned long.

> 
> Addresses-Coverity-ID: 1230257
Reviewed-by: Peter Senna Tschudin <peter.senna@...il.com>
> Signed-off-by: Gustavo A. R. Silva <garsilva@...eddedor.com>
> ---
>  drivers/usb/misc/lvstest.c | 2 +-
>  1 file changed, 1 insertion(+), 1 deletion(-)
> 
> diff --git a/drivers/usb/misc/lvstest.c b/drivers/usb/misc/lvstest.c
> index c7c2104..6f37610 100644
> --- a/drivers/usb/misc/lvstest.c
> +++ b/drivers/usb/misc/lvstest.c
> @@ -193,7 +193,7 @@ static ssize_t u2_timeout_store(struct device *dev,
>  		return ret;
>  	}
>  
> -	if (val < 0 || val > 127)
> +	if (val > 127)
>  		return -EINVAL;
>  
>  	ret = lvs_rh_set_port_feature(hdev, lvs->portnum | (val << 8),
> -- 
> 2.5.0
>