Re: [Outreachy kernel] [PATCH] staging: rtl8723bs: Remove comparisons to NULL in conditionals

[Julia Lawall <julia.lawall@inria.fr>]

On Mon, 23 Mar 2020, Simran Singhal wrote:

> Remove comparisons to NULL in conditionals in
> drivers/staging/rtl8723bs/core/rtw_ap.c
> Issues reported by checkpatch.pl as:
> CHECK: Comparison to NULL could be written

The patch also drops some parentheses that are completely unrelated to the
change described here.  These changes should not be done in this patch.

There is no need to give the name of the file in the log message.  One can
see that directly in the patch.  Likewise, it is not necessary to give the
complete message from checkpatch.  Saying that checkpatch identified the
problem is good enough.

A good commit log message should say what you have done and why.  The
message above is missing the "why" part.  Why is it a good idea to remove
the NULL comparisons, beyond that checkpatch said that it was something to
check?

julia

>
> Signed-off-by: Simran Singhal <singhalsimran0@gmail.com>
> ---
>  drivers/staging/rtl8723bs/core/rtw_ap.c | 30 ++++++++++++-------------
>  1 file changed, 15 insertions(+), 15 deletions(-)
>
> diff --git a/drivers/staging/rtl8723bs/core/rtw_ap.c b/drivers/staging/rtl8723bs/core/rtw_ap.c
> index a76e81330756..82b977c07205 100644
> --- a/drivers/staging/rtl8723bs/core/rtw_ap.c
> +++ b/drivers/staging/rtl8723bs/core/rtw_ap.c
> @@ -79,7 +79,7 @@ static void update_BCNTIM(struct adapter *padapter)
>  			&tim_ielen,
>  			pnetwork_mlmeext->IELength - _FIXED_IE_LENGTH_
>  		);
> -		if (p != NULL && tim_ielen > 0) {
> +		if (p && tim_ielen > 0) {
>  			tim_ielen += 2;
>
>  			premainder_ie = p + tim_ielen;
> @@ -103,7 +103,7 @@ static void update_BCNTIM(struct adapter *padapter)
>  				&tmp_len,
>  				(pnetwork_mlmeext->IELength - _BEACON_IE_OFFSET_)
>  			);
> -			if (p != NULL)
> +			if (p)
>  				offset += tmp_len + 2;
>
>  			/*  get supported rates len */
> @@ -112,7 +112,7 @@ static void update_BCNTIM(struct adapter *padapter)
>  				_SUPPORTEDRATES_IE_, &tmp_len,
>  				(pnetwork_mlmeext->IELength - _BEACON_IE_OFFSET_)
>  			);
> -			if (p !=  NULL)
> +			if (p)
>  				offset += tmp_len + 2;
>
>  			/* DS Parameter Set IE, len =3 */
> @@ -1036,7 +1036,7 @@ int rtw_check_beacon_data(struct adapter *padapter, u8 *pbuf,  int len)
>  		&ie_len,
>  		(pbss_network->IELength - _BEACON_IE_OFFSET_)
>  	);
> -	if (p !=  NULL) {
> +	if (p) {
>  		memcpy(supportRate, p + 2, ie_len);
>  		supportRateNum = ie_len;
>  	}
> @@ -1048,7 +1048,7 @@ int rtw_check_beacon_data(struct adapter *padapter, u8 *pbuf,  int len)
>  		&ie_len,
>  		pbss_network->IELength - _BEACON_IE_OFFSET_
>  	);
> -	if (p !=  NULL) {
> +	if (p) {
>  		memcpy(supportRate + supportRateNum, p + 2, ie_len);
>  		supportRateNum += ie_len;
>  	}
> @@ -1136,8 +1136,8 @@ int rtw_check_beacon_data(struct adapter *padapter, u8 *pbuf,  int len)
>  			break;
>  		}
>
> -		if ((p == NULL) || (ie_len == 0))
> -				break;
> +		if (!p || ie_len == 0)
> +			break;
>  	}
>
>  	/* wmm */
> @@ -1165,7 +1165,7 @@ int rtw_check_beacon_data(struct adapter *padapter, u8 *pbuf,  int len)
>  				break;
>  			}
>
> -			if ((p == NULL) || (ie_len == 0))
> +			if (!p || ie_len == 0)
>  				break;
>  		}
>  	}
> @@ -1296,7 +1296,7 @@ int rtw_check_beacon_data(struct adapter *padapter, u8 *pbuf,  int len)
>  	psta = rtw_get_stainfo(&padapter->stapriv, pbss_network->MacAddress);
>  	if (!psta) {
>  		psta = rtw_alloc_stainfo(&padapter->stapriv, pbss_network->MacAddress);
> -		if (psta == NULL)
> +		if (!psta)
>  			return _FAIL;
>  	}
>
> @@ -1453,7 +1453,7 @@ u8 rtw_ap_set_pairwise_key(struct adapter *padapter, struct sta_info *psta)
>  	}
>
>  	psetstakey_para = rtw_zmalloc(sizeof(struct set_stakey_parm));
> -	if (psetstakey_para == NULL) {
> +	if (!psetstakey_para) {
>  		kfree(ph2c);
>  		res = _FAIL;
>  		goto exit;
> @@ -1491,12 +1491,12 @@ static int rtw_ap_set_key(
>  	/* DBG_871X("%s\n", __func__); */
>
>  	pcmd = rtw_zmalloc(sizeof(struct cmd_obj));
> -	if (pcmd == NULL) {
> +	if (!pcmd) {
>  		res = _FAIL;
>  		goto exit;
>  	}
>  	psetkeyparm = rtw_zmalloc(sizeof(struct setkey_parm));
> -	if (psetkeyparm == NULL) {
> +	if (!psetkeyparm) {
>  		kfree(pcmd);
>  		res = _FAIL;
>  		goto exit;
> @@ -1668,11 +1668,11 @@ static void update_bcn_wps_ie(struct adapter *padapter)
>  		&wps_ielen
>  	);
>
> -	if (pwps_ie == NULL || wps_ielen == 0)
> +	if (!pwps_ie || wps_ielen == 0)
>  		return;
>
>  	pwps_ie_src = pmlmepriv->wps_beacon_ie;
> -	if (pwps_ie_src == NULL)
> +	if (!pwps_ie_src)
>  		return;
>
>  	wps_offset = (uint)(pwps_ie - ie);
> @@ -2322,7 +2322,7 @@ void rtw_ap_restore_network(struct adapter *padapter)
>  	for (i = 0; i < chk_alive_num; i++) {
>  		psta = rtw_get_stainfo_by_offset(pstapriv, chk_alive_list[i]);
>
> -		if (psta == NULL) {
> +		if (!psta) {
>  			DBG_871X(FUNC_ADPT_FMT" sta_info is null\n", FUNC_ADPT_ARG(padapter));
>  		} else if (psta->state & _FW_LINKED) {
>  			rtw_sta_media_status_rpt(padapter, psta, 1);
> --
> 2.17.1
>
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