linux-kernel - [PATCH v2 3/3] staging: rtl8723bs: Prevent duplicate NULL tests on a value

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Message-Id: <1325d06f5a4eb18eb52eb20d5af89207504c46b6.1743685415.git.abrahamadekunle50@gmail.com>
Date: Thu,  3 Apr 2025 14:26:43 +0100
From: Abraham Samuel Adekunle <abrahamadekunle50@...il.com>
To: outreachy@...ts.linux.dev,
	julia.lawall@...ia.fr
Cc: gregkh@...uxfoundation.org,
	linux-staging@...ts.linux.dev,
	linux-kernel@...r.kernel.org,
	andy@...nel.org,
	hdegoede@...hat.com,
	mchehab@...nel.org,
	sakari.ailus@...ux.intel.com,
	Abraham Samuel Adekunle <abrahamadekunle50@...il.com>
Subject: [PATCH v2 3/3] staging: rtl8723bs: Prevent duplicate NULL tests on a value

When a value has been tested for NULL in an expression, a
second NULL test on the same value in another expression
is unnecessary when the value has not been assigned NULL.

Remove unnecessary duplicate NULL tests on the same value that
has previously been NULL tested.

Found by Coccinelle

Signed-off-by: Abraham Samuel Adekunle <abrahamadekunle50@...il.com>
---
 drivers/staging/rtl8723bs/core/rtw_mlme_ext.c |  2 +-
 drivers/staging/rtl8723bs/core/rtw_xmit.c     | 56 +++++++++----------
 2 files changed, 28 insertions(+), 30 deletions(-)

diff --git a/drivers/staging/rtl8723bs/core/rtw_mlme_ext.c b/drivers/staging/rtl8723bs/core/rtw_mlme_ext.c
index 90966b7034ab..675226535cd1 100644
--- a/drivers/staging/rtl8723bs/core/rtw_mlme_ext.c
+++ b/drivers/staging/rtl8723bs/core/rtw_mlme_ext.c
@@ -1323,7 +1323,7 @@ unsigned int OnAssocReq(struct adapter *padapter, union recv_frame *precv_frame)
 	spin_unlock_bh(&pstapriv->asoc_list_lock);
 
 	/*  now the station is qualified to join our BSS... */
-	if (pstat && (pstat->state & WIFI_FW_ASSOC_SUCCESS) && (status == WLAN_STATUS_SUCCESS)) {
+	if ((pstat->state & WIFI_FW_ASSOC_SUCCESS) && (status == WLAN_STATUS_SUCCESS)) {
 		/* 1 bss_cap_update & sta_info_update */
 		bss_cap_update_on_sta_join(padapter, pstat);
 		sta_info_update(padapter, pstat);
diff --git a/drivers/staging/rtl8723bs/core/rtw_xmit.c b/drivers/staging/rtl8723bs/core/rtw_xmit.c
index 026061b464f7..f817cab2f831 100644
--- a/drivers/staging/rtl8723bs/core/rtw_xmit.c
+++ b/drivers/staging/rtl8723bs/core/rtw_xmit.c
@@ -941,35 +941,33 @@ s32 rtw_make_wlanhdr(struct adapter *padapter, u8 *hdr, struct pkt_attrib *pattr
 			if (!(psta->state & _FW_LINKED))
 				return _FAIL;
 
-			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];
-
-				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;
-
-				/* 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];
-
-					/* 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 */
-					}
+			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);
+
+			/* 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;
+
+				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;
+
+					pattrib->ampdu_en = true;/* AGG EN */
+				} else {
+					psta->BA_starting_seqctrl[pattrib->priority & 0x0f] = (pattrib->seqnum+1)&0xfff;
+					pattrib->ampdu_en = true;/* AGG EN */
 				}
 			}
 		}
-- 
2.34.1