linux-kernel - Re: [Outreachy kernel] [PATCH] staging: rtl8723bs: core: Refactor nested if-else

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Date:   Mon, 25 Oct 2021 14:43:03 +0530
From:   Praveen Kumar <kpraveen.lkml@...il.com>
To:     Kushal Kothari <kushalkothari285@...il.com>,
        gregkh@...uxfoundation.org, fabioaiuto83@...il.com,
        ross.schm.dev@...il.com, hdegoede@...hat.com,
        marcocesati@...il.com, fmdefrancesco@...il.com,
        linux-staging@...ts.linux.dev, linux-kernel@...r.kernel.org,
        outreachy-kernel@...glegroups.com, mike.rapoport@...il.com,
        kushalkothari2850@...il.com
Subject: Re: [Outreachy kernel] [PATCH] staging: rtl8723bs: core: Refactor
 nested if-else

On 25-10-2021 12:55, Kushal Kothari wrote:
> Refactor nested if else by combining nested if into a single if condition and removing unnecessary else conditionals which leads to removing unnecessary tabs .There is no change in logic of new code.
> checkpatch warning : Too many leading tabs - consider code refactoring
> 
> Signed-off-by: Kushal Kothari <kushalkothari285@...il.com>
> ---
>  drivers/staging/rtl8723bs/core/rtw_mlme_ext.c | 65 ++++++++-----------
>  1 file changed, 26 insertions(+), 39 deletions(-)
> 
> diff --git a/drivers/staging/rtl8723bs/core/rtw_mlme_ext.c b/drivers/staging/rtl8723bs/core/rtw_mlme_ext.c
> index 0f82f5031c43..eb10b6f85426 100644
> --- a/drivers/staging/rtl8723bs/core/rtw_mlme_ext.c
> +++ b/drivers/staging/rtl8723bs/core/rtw_mlme_ext.c
> @@ -1192,46 +1192,33 @@ unsigned int OnAssocReq(struct adapter *padapter, union recv_frame *precv_frame)
>  		p = pframe + WLAN_HDR_A3_LEN + ie_offset; ie_len = 0;
>  		for (;;) {
>  			p = rtw_get_ie(p, WLAN_EID_VENDOR_SPECIFIC, &ie_len, pkt_len - WLAN_HDR_A3_LEN - ie_offset);
> -			if (p) {
> -				if (!memcmp(p+2, WMM_IE, 6)) {
> -
> -					pstat->flags |= WLAN_STA_WME;
> -
> -					pstat->qos_option = 1;
> -					pstat->qos_info = *(p+8);
> -
> -					pstat->max_sp_len = (pstat->qos_info>>5)&0x3;
> -
> -					if ((pstat->qos_info&0xf) != 0xf)
> -						pstat->has_legacy_ac = true;
> -					else
> -						pstat->has_legacy_ac = false;
> -
> -					if (pstat->qos_info&0xf) {
> -						if (pstat->qos_info&BIT(0))
> -							pstat->uapsd_vo = BIT(0)|BIT(1);
> -						else
> -							pstat->uapsd_vo = 0;
> -
> -						if (pstat->qos_info&BIT(1))
> -							pstat->uapsd_vi = BIT(0)|BIT(1);
> -						else
> -							pstat->uapsd_vi = 0;
> -
> -						if (pstat->qos_info&BIT(2))
> -							pstat->uapsd_bk = BIT(0)|BIT(1);
> -						else
> -							pstat->uapsd_bk = 0;
> -
> -						if (pstat->qos_info&BIT(3))
> -							pstat->uapsd_be = BIT(0)|BIT(1);
> -						else
> -							pstat->uapsd_be = 0;
> -
> -					}
> -
> -					break;
> +			if (p && !memcmp(p+2, WMM_IE, 6)) {
> +				pstat->flags |= WLAN_STA_WME;
> +				pstat->qos_option = 1;
> +				pstat->qos_info = *(p+8);
> +				pstat->max_sp_len = (pstat->qos_info>>5)&0x3;
> +				pstat->has_legacy_ac = false;
> +				if ((pstat->qos_info&0xf) != 0xf)
> +					pstat->has_legacy_ac = true;
> +
> +				pstat->uapsd_vo = 0;
> +				if (pstat->qos_info&0xf) {
> +					if (pstat->qos_info&BIT(0))
> +						pstat->uapsd_vo = BIT(0)|BIT(1);
> +
> +					pstat->uapsd_vi = 0;
> +					if (pstat->qos_info&BIT(1))
> +						pstat->uapsd_vi = BIT(0)|BIT(1);
> +
> +					pstat->uapsd_bk = 0;
> +					if (pstat->qos_info&BIT(2))
> +						pstat->uapsd_bk = BIT(0)|BIT(1);
> +
> +					pstat->uapsd_be = 0;
> +					if (pstat->qos_info&BIT(3))
> +						pstat->uapsd_be = BIT(0)|BIT(1);
>  				}
> +				break;
>  			} else {
>  				break;
>  			}

there is a bug here, if *p* is not null, and *memcmp* failed; then we fall in else part and break, and will miss the next entry in *p* using below statement

p = p + ie_len + 2;


> 

Regards,

~Praveen.