linux-kernel - Re: [PATCH] staging: rtl8723bs: core: simplify the if condition

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Date:   Sat, 9 Oct 2021 18:51:22 +0200
From:   Hans de Goede <hdegoede@...hat.com>
To:     Saurav Girepunje <saurav.girepunje@...il.com>,
        gregkh@...uxfoundation.org, fabioaiuto83@...il.com,
        ross.schm.dev@...il.com, deborahbrouwer3563@...il.com,
        marcocesati@...il.com, phil@...lpotter.co.uk,
        linux-staging@...ts.linux.dev, linux-kernel@...r.kernel.org
Cc:     saurav.girepunje@...mail.com
Subject: Re: [PATCH] staging: rtl8723bs: core: simplify the if condition

Hi,

On 10/9/21 8:00 AM, Saurav Girepunje wrote:
> if psta is NULL, function is returning with fail. On next if condition
> again checking if psta is not a NULL. Remove multiple if condition check.
> 
> Function is already using goto exit statement to exit.Replace multiple
> return with goto exit statement.
> 
> Signed-off-by: Saurav Girepunje <saurav.girepunje@...il.com>
> ---
>  drivers/staging/rtl8723bs/core/rtw_xmit.c | 61 ++++++++++-------------
>  1 file changed, 26 insertions(+), 35 deletions(-)
> 
> diff --git a/drivers/staging/rtl8723bs/core/rtw_xmit.c b/drivers/staging/rtl8723bs/core/rtw_xmit.c
> index 34505b35a7f3..4e4a1bed882b 100644
> --- a/drivers/staging/rtl8723bs/core/rtw_xmit.c
> +++ b/drivers/staging/rtl8723bs/core/rtw_xmit.c
> @@ -932,49 +932,40 @@ s32 rtw_make_wlanhdr(struct adapter *padapter, u8 *hdr, struct pkt_attrib *pattr
>  		/* TODO: fill HT Control Field */
> 
>  		/* Update Seq Num will be handled by f/w */
> -		{
> -			struct sta_info *psta;
> -
> -			psta = rtw_get_stainfo(&padapter->stapriv, pattrib->ra);
> -			if (pattrib->psta != psta)
> -				return _FAIL;
> -
> -			if (!psta)
> -				return _FAIL;
> +		struct sta_info *psta;

You are now declaring a variable after some statements, this will
cause a compiler warning in some cases. Please move this variable
declaration up, grouping it together with the other variable
declarations.

> 
> -			if (!(psta->state & _FW_LINKED))
> -				return _FAIL;
> +		psta = rtw_get_stainfo(&padapter->stapriv, pattrib->ra);
> +		if (!psta || pattrib->psta != psta || !(psta->state & _FW_LINKED))
> +			res = _FAIL;
> +			goto exit;

You are both removing an identation level here because you are removing
the compound statement which contained the psta declaration as well
as refactoring the code.

Please split this into 2 separate commits, 1 where you only drop the
extra indentation level (and move the psta declaration up).

And then a separate commit which just the actual code changes.

Your current patch is very hard to review because you are doing
2 things at once.

Also it looks like this patch depends on your previous patch:
"[PATCH] staging: rtl8723bs: core: remove empty else section"

When patches depend on each other please send them together
as a single patch series. E.g. for version 2 (v2) of a 3 patch
series consisting of the last 3 commits in your local tree use
(so the next version of these patches) use:

git format-patch -v2 --cover-letter HEAD~3
$editor v2-0000-cover-letter.patch 
 <describe series contents + what was changed in the cover-letter>
git send-email v2-00*.patch

Regards,

Hans


> 
> -			if (psta) {
> -				psta->sta_xmitpriv.txseq_tid[pattrib->priority]++;
> -				psta->sta_xmitpriv.txseq_tid[pattrib->priority] &= 0xFFF;
> -				pattrib->seqnum = psta->sta_xmitpriv.txseq_tid[pattrib->priority];
> +		psta->sta_xmitpriv.txseq_tid[pattrib->priority]++;
> +		psta->sta_xmitpriv.txseq_tid[pattrib->priority] &= 0xFFF;
> +		pattrib->seqnum = psta->sta_xmitpriv.txseq_tid[pattrib->priority];
> 
> -				SetSeqNum(hdr, pattrib->seqnum);
> +		SetSeqNum(hdr, pattrib->seqnum);
> 
> -				/* check if enable ampdu */
> -				if (pattrib->ht_en && psta->htpriv.ampdu_enable)
> -					if (psta->htpriv.agg_enable_bitmap & BIT(pattrib->priority))
> -						pattrib->ampdu_en = true;
> +		/* check if enable ampdu */
> +		if (pattrib->ht_en && psta->htpriv.ampdu_enable)
> +			if (psta->htpriv.agg_enable_bitmap & BIT(pattrib->priority))
> +				pattrib->ampdu_en = true;
> 
> -				/* re-check if enable ampdu by BA_starting_seqctrl */
> -				if (pattrib->ampdu_en == true) {
> -					u16 tx_seq;
> +		/* re-check if enable ampdu by BA_starting_seqctrl */
> +		if (pattrib->ampdu_en == true) {
> +			u16 tx_seq;
> 
> -					tx_seq = psta->BA_starting_seqctrl[pattrib->priority & 0x0f];
> +			tx_seq = psta->BA_starting_seqctrl[pattrib->priority & 0x0f];
> 
> -					/* check BA_starting_seqctrl */
> -					if (SN_LESS(pattrib->seqnum, tx_seq)) {
> -						pattrib->ampdu_en = false;/* AGG BK */
> -					} else if (SN_EQUAL(pattrib->seqnum, tx_seq)) {
> -						psta->BA_starting_seqctrl[pattrib->priority & 0x0f] = (tx_seq+1)&0xfff;
> +			/* check BA_starting_seqctrl */
> +			if (SN_LESS(pattrib->seqnum, tx_seq)) {
> +				pattrib->ampdu_en = false;/* AGG BK */
> +			} else if (SN_EQUAL(pattrib->seqnum, tx_seq)) {
> +				psta->BA_starting_seqctrl[pattrib->priority & 0x0f] = (tx_seq+1)&0xfff;
> 
> -						pattrib->ampdu_en = true;/* AGG EN */
> -					} else {
> -						psta->BA_starting_seqctrl[pattrib->priority & 0x0f] = (pattrib->seqnum+1)&0xfff;
> -						pattrib->ampdu_en = true;/* AGG EN */
> -					}
> -				}
> +				pattrib->ampdu_en = true;/* AGG EN */
> +			} else {
> +				psta->BA_starting_seqctrl[pattrib->priority & 0x0f] = (pattrib->seqnum+1)&0xfff;
> +				pattrib->ampdu_en = true;/* AGG EN */
>  			}
>  		}
>  	}
> --
> 2.32.0
>