linux-kernel - Re: [PATCH] staging: rtl8723bs: remove redundant comparisons of unsigned ints with >= 0

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Date:   Fri, 14 Apr 2017 14:15:22 +0200
From:   Hans de Goede <hdegoede@...hat.com>
To:     Colin King <colin.king@...onical.com>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Larry Finger <Larry.Finger@...inger.net>,
        devel@...verdev.osuosl.org
Cc:     kernel-janitors@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] staging: rtl8723bs: remove redundant comparisons of
 unsigned ints with >= 0

Hi,

On 13-04-17 16:13, Colin King wrote:
> From: Colin Ian King <colin.king@...onical.com>
>
> The comparison of mode >= 0 is redundant as mode is a u32 and this
> is always true.  Remove this redundant code.
>
> Detected with CoverityScan ("Unsigned compared against 0")
>
> Signed-off-by: Colin Ian King <colin.king@...onical.com>

Patch looks good to me:

Reviewed-by: Hans de Goede <hdegoede@...hat.com>

Regards,

Hans


> ---
>  drivers/staging/rtl8723bs/core/rtw_debug.c | 6 +++---
>  1 file changed, 3 insertions(+), 3 deletions(-)
>
> diff --git a/drivers/staging/rtl8723bs/core/rtw_debug.c b/drivers/staging/rtl8723bs/core/rtw_debug.c
> index 51cef55d3f76..fc6b94d59c37 100644
> --- a/drivers/staging/rtl8723bs/core/rtw_debug.c
> +++ b/drivers/staging/rtl8723bs/core/rtw_debug.c
> @@ -1031,7 +1031,7 @@ ssize_t proc_set_ht_enable(struct file *file, const char __user *buffer, size_t
>  	if (buffer && !copy_from_user(tmp, buffer, sizeof(tmp))) {
>  		sscanf(tmp, "%d ", &mode);
>
> -		if (pregpriv && mode >= 0 && mode < 2) {
> +		if (pregpriv && mode < 2) {
>  			pregpriv->ht_enable = mode;
>  			printk("ht_enable =%d\n", pregpriv->ht_enable);
>  		}
> @@ -1150,7 +1150,7 @@ ssize_t proc_set_rx_ampdu(struct file *file, const char __user *buffer, size_t c
>
>  		sscanf(tmp, "%d ", &mode);
>
> -		if (pregpriv && mode >= 0 && mode < 2) {
> +		if (pregpriv && mode < 2) {
>  			pmlmeinfo->bAcceptAddbaReq = mode;
>  			DBG_871X("pmlmeinfo->bAcceptAddbaReq =%d\n", pmlmeinfo->bAcceptAddbaReq);
>  			if (mode == 0) {
> @@ -1191,7 +1191,7 @@ ssize_t proc_set_en_fwps(struct file *file, const char __user *buffer, size_t co
>  	if (buffer && !copy_from_user(tmp, buffer, sizeof(tmp))) {
>  		sscanf(tmp, "%d ", &mode);
>
> -		if (pregpriv && mode >= 0 && mode < 2) {
> +		if (pregpriv && mode < 2) {
>  			pregpriv->check_fw_ps = mode;
>  			DBG_871X("pregpriv->check_fw_ps =%d\n", pregpriv->check_fw_ps);
>  		}
>