linux-kernel - [PATCH v11 2/2] staging: rtl8723bs: Use % 4096 instead of & 0xfff

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Message-Id: <e8d515539ba560961003eae15d301d03e6cdd17d.1744966511.git.abrahamadekunle50@gmail.com>
Date: Fri, 18 Apr 2025 09:47:55 +0000
From: Abraham Samuel Adekunle <abrahamadekunle50@...il.com>
To: julia.lawall@...ia.fr,
	gregkh@...uxfoundation.org
Cc: linux-staging@...ts.linux.dev,
	linux-kernel@...r.kernel.org,
	david.laight.linux@...il.com,
	dan.carpenter@...aro.org,
	andy@...nel.org,
	Abraham Samuel Adekunle <abrahamadekunle50@...il.com>
Subject: [PATCH v11 2/2] staging: rtl8723bs: Use % 4096 instead of & 0xfff

The sequence number is constrained to a range of [0, 4095], which
is a total of 4096 values. The bitmask operation using `& 0xfff` is
used to perform this wrap-around. While this is functionally correct,
it obscures the intended semantic of a 4096-based wrap.

Using a modulo operation `% 4096u` makes the wrap-around logic
explicit and easier to understand. It clearly signals that the
sequence number cycles through a range of 4096 values.
It also makes the code robust against potential changes of the 4096
upper limit, especially when it becomes a non power-of-2 value while
the AND(&) works solely for power-of-2 values.

The use of `% 4096u` also guarantees that the modulo operation is
performed with unsigned arithmetic, preventing potential issues with
the signed types.

Found by Coccinelle.

Suggested-by: Andy Shevchenko <andy@...nel.org>
Suggested-by: David Laight <david.laight.linux@...il.com>
Signed-off-by: Abraham Samuel Adekunle <abrahamadekunle50@...il.com>
Reviewed-by: Andy Shevchenko <andy@...nel.org>
---
 drivers/staging/rtl8723bs/core/rtw_mlme_ext.c | 2 +-
 drivers/staging/rtl8723bs/core/rtw_recv.c     | 6 +++---
 drivers/staging/rtl8723bs/core/rtw_xmit.c     | 6 +++---
 3 files changed, 7 insertions(+), 7 deletions(-)

diff --git a/drivers/staging/rtl8723bs/core/rtw_mlme_ext.c b/drivers/staging/rtl8723bs/core/rtw_mlme_ext.c
index 952ce6dd5af9..f712ea0cabee 100644
--- a/drivers/staging/rtl8723bs/core/rtw_mlme_ext.c
+++ b/drivers/staging/rtl8723bs/core/rtw_mlme_ext.c
@@ -3511,7 +3511,7 @@ void issue_action_BA(struct adapter *padapter, unsigned char *raddr, unsigned ch
 			/* if ((psta = rtw_get_stainfo(pstapriv, pmlmeinfo->network.mac_address)) != NULL) */
 			psta = rtw_get_stainfo(pstapriv, raddr);
 			if (psta) {
-				start_seq = (psta->sta_xmitpriv.txseq_tid[status & 0x07]&0xfff) + 1;
+				start_seq = (psta->sta_xmitpriv.txseq_tid[status & 0x07] % 4096u) + 1;
 
 				psta->BA_starting_seqctrl[status & 0x07] = start_seq;
 
diff --git a/drivers/staging/rtl8723bs/core/rtw_recv.c b/drivers/staging/rtl8723bs/core/rtw_recv.c
index a389ba5ecc6f..25411cc5c738 100644
--- a/drivers/staging/rtl8723bs/core/rtw_recv.c
+++ b/drivers/staging/rtl8723bs/core/rtw_recv.c
@@ -1641,7 +1641,7 @@ static int check_indicate_seq(struct recv_reorder_ctrl *preorder_ctrl, u16 seq_n
 	struct dvobj_priv *psdpriv = padapter->dvobj;
 	struct debug_priv *pdbgpriv = &psdpriv->drv_dbg;
 	u8 wsize = preorder_ctrl->wsize_b;
-	u16 wend = (preorder_ctrl->indicate_seq + wsize - 1) & 0xFFF;/*  4096; */
+	u16 wend = (preorder_ctrl->indicate_seq + wsize - 1) % 4096u;
 
 	/*  Rx Reorder initialize condition. */
 	if (preorder_ctrl->indicate_seq == 0xFFFF)
@@ -1657,7 +1657,7 @@ static int check_indicate_seq(struct recv_reorder_ctrl *preorder_ctrl, u16 seq_n
 	/*  2. Incoming SeqNum is larger than the WinEnd => Window shift N */
 	/*  */
 	if (SN_EQUAL(seq_num, preorder_ctrl->indicate_seq)) {
-		preorder_ctrl->indicate_seq = (preorder_ctrl->indicate_seq + 1) & 0xFFF;
+		preorder_ctrl->indicate_seq = (preorder_ctrl->indicate_seq + 1) % 4096u;
 
 	} else if (SN_LESS(wend, seq_num)) {
 		/*  boundary situation, when seq_num cross 0xFFF */
@@ -1772,7 +1772,7 @@ static int recv_indicatepkts_in_order(struct adapter *padapter, struct recv_reor
 			list_del_init(&(prframe->u.hdr.list));
 
 			if (SN_EQUAL(preorder_ctrl->indicate_seq, pattrib->seq_num))
-				preorder_ctrl->indicate_seq = (preorder_ctrl->indicate_seq + 1) & 0xFFF;
+				preorder_ctrl->indicate_seq = (preorder_ctrl->indicate_seq + 1) % 4096u;
 
 			/* Set this as a lock to make sure that only one thread is indicating packet. */
 			/* pTS->RxIndicateState = RXTS_INDICATE_PROCESSING; */
diff --git a/drivers/staging/rtl8723bs/core/rtw_xmit.c b/drivers/staging/rtl8723bs/core/rtw_xmit.c
index 5def2467f42b..76f25ab6a779 100644
--- a/drivers/staging/rtl8723bs/core/rtw_xmit.c
+++ b/drivers/staging/rtl8723bs/core/rtw_xmit.c
@@ -943,7 +943,7 @@ s32 rtw_make_wlanhdr(struct adapter *padapter, u8 *hdr, struct pkt_attrib *pattr
 
 			if (psta) {
 				psta->sta_xmitpriv.txseq_tid[pattrib->priority]++;
-				psta->sta_xmitpriv.txseq_tid[pattrib->priority] &= 0xFFF;
+				psta->sta_xmitpriv.txseq_tid[pattrib->priority] %= 4096u;
 				pattrib->seqnum = psta->sta_xmitpriv.txseq_tid[pattrib->priority];
 
 				SetSeqNum(hdr, pattrib->seqnum);
@@ -964,12 +964,12 @@ s32 rtw_make_wlanhdr(struct adapter *padapter, u8 *hdr, struct pkt_attrib *pattr
 						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;
+							(tx_seq + 1) % 4096u;
 
 						pattrib->ampdu_en = true;/* AGG EN */
 					} else {
 						psta->BA_starting_seqctrl[pattrib->priority & 0x0f] =
-							(pattrib->seqnum + 1) & 0xfff;
+							(pattrib->seqnum + 1) % 4096u;
 
 						pattrib->ampdu_en = true;/* AGG EN */
 					}
-- 
2.34.1