[PATCH v2 1/2] staging: rtl8723bs: use guard clause for AES check

[Lin YuChen <starpt.official@gmail.com>]

Refactor the AES encryption check by using a guard clause to
reduce the indentation level of the subsequent logic.

Signed-off-by: Lin YuChen <starpt.official@gmail.com>
---
 drivers/staging/rtl8723bs/core/rtw_security.c | 107 +++++++++---------
 1 file changed, 55 insertions(+), 52 deletions(-)

diff --git a/drivers/staging/rtl8723bs/core/rtw_security.c b/drivers/staging/rtl8723bs/core/rtw_security.c
index b489babe7432..971d913ec6b3 100644
--- a/drivers/staging/rtl8723bs/core/rtw_security.c
+++ b/drivers/staging/rtl8723bs/core/rtw_security.c
@@ -1213,68 +1213,71 @@ u32 rtw_aes_decrypt(struct adapter *padapter, u8 *precvframe)
 
 	pframe = (unsigned char *)((union recv_frame *)precvframe)->u.hdr.rx_data;
 	/* 4 start to encrypt each fragment */
-	if (prxattrib->encrypt == _AES_) {
-		stainfo = rtw_get_stainfo(&padapter->stapriv, &prxattrib->ta[0]);
-		if (stainfo) {
-			if (is_multicast_ether_addr(prxattrib->ra)) {
-				static unsigned long start;
-				static u32 no_gkey_bc_cnt;
-				static u32 no_gkey_mc_cnt;
-
-				if (!psecuritypriv->binstallGrpkey) {
-					res = _FAIL;
+	if (prxattrib->encrypt != _AES_)
+		goto exit;
+	stainfo = rtw_get_stainfo(&padapter->stapriv, &prxattrib->ta[0]);
+	if (stainfo) {
+		if (is_multicast_ether_addr(prxattrib->ra)) {
+			static unsigned long start;
+			static u32 no_gkey_bc_cnt;
+			static u32 no_gkey_mc_cnt;
+
+			if (!psecuritypriv->binstallGrpkey) {
+				res = _FAIL;
 
-					if (start == 0)
-						start = jiffies;
+				if (start == 0)
+					start = jiffies;
 
-					if (is_broadcast_mac_addr(prxattrib->ra))
-						no_gkey_bc_cnt++;
-					else
-						no_gkey_mc_cnt++;
-
-					if (jiffies_to_msecs(jiffies - start) > 1000) {
-						if (no_gkey_bc_cnt || no_gkey_mc_cnt) {
-							netdev_dbg(padapter->pnetdev,
-								   FUNC_ADPT_FMT " no_gkey_bc_cnt:%u, no_gkey_mc_cnt:%u\n",
-								   FUNC_ADPT_ARG(padapter),
-								   no_gkey_bc_cnt,
-								   no_gkey_mc_cnt);
-						}
-						start = jiffies;
-						no_gkey_bc_cnt = 0;
-						no_gkey_mc_cnt = 0;
+				if (is_broadcast_mac_addr(prxattrib->ra))
+					no_gkey_bc_cnt++;
+				else
+					no_gkey_mc_cnt++;
+
+				if (jiffies_to_msecs(jiffies - start) > 1000) {
+					if (no_gkey_bc_cnt || no_gkey_mc_cnt) {
+						netdev_dbg(padapter->pnetdev,
+							   FUNC_ADPT_FMT " no_gkey_bc_cnt:%u, no_gkey_mc_cnt:%u\n",
+							   FUNC_ADPT_ARG(padapter), no_gkey_bc_cnt,
+							   no_gkey_mc_cnt);
 					}
-
-					goto exit;
+					start = jiffies;
+					no_gkey_bc_cnt = 0;
+					no_gkey_mc_cnt = 0;
 				}
 
-				if (no_gkey_bc_cnt || no_gkey_mc_cnt) {
-					netdev_dbg(padapter->pnetdev,
-						   FUNC_ADPT_FMT " gkey installed. no_gkey_bc_cnt:%u, no_gkey_mc_cnt:%u\n",
-						   FUNC_ADPT_ARG(padapter),
-						   no_gkey_bc_cnt,
-						   no_gkey_mc_cnt);
-				}
-				start = 0;
-				no_gkey_bc_cnt = 0;
-				no_gkey_mc_cnt = 0;
+				goto exit;
+			}
 
-				prwskey = psecuritypriv->dot118021XGrpKey[prxattrib->key_index].skey;
-				if (psecuritypriv->dot118021XGrpKeyid != prxattrib->key_index) {
-					res = _FAIL;
-					goto exit;
-				}
-			} else {
-				prwskey = &stainfo->dot118021x_UncstKey.skey[0];
+			if (no_gkey_bc_cnt || no_gkey_mc_cnt) {
+				netdev_dbg(padapter->pnetdev,
+					   FUNC_ADPT_FMT " gkey installed. no_gkey_bc_cnt:%u, no_gkey_mc_cnt:%u\n",
+					   FUNC_ADPT_ARG(padapter), no_gkey_bc_cnt,
+					   no_gkey_mc_cnt);
+			}
+			start = 0;
+			no_gkey_bc_cnt = 0;
+			no_gkey_mc_cnt = 0;
+
+			prwskey =
+				psecuritypriv
+					->dot118021XGrpKey[prxattrib->key_index]
+					.skey;
+			if (psecuritypriv->dot118021XGrpKeyid !=
+			    prxattrib->key_index) {
+				res = _FAIL;
+				goto exit;
 			}
+		} else {
+			prwskey = &stainfo->dot118021x_UncstKey.skey[0];
+		}
 
-			length = ((union recv_frame *)precvframe)->u.hdr.len - prxattrib->hdrlen - prxattrib->iv_len;
+		length = ((union recv_frame *)precvframe)->u.hdr.len -
+			 prxattrib->hdrlen - prxattrib->iv_len;
 
-			res = aes_decipher(prwskey, prxattrib->hdrlen, pframe, length);
+		res = aes_decipher(prwskey, prxattrib->hdrlen, pframe, length);
 
-		} else {
-			res = _FAIL;
-		}
+	} else {
+		res = _FAIL;
 	}
 exit:
 	return res;
-- 
2.34.1