drivers/net/wireless/marvell/mwifiex/cfg80211.c:1307 mwifiex_cfg80211_change_virtual_intf() warn: ignoring unreachable code.

From: Dan Carpenter
Date: Mon Nov 22 2021 - 06:04:36 EST

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tree: https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git master
head: 923dcc5eb0c111eccd51cc7ce1658537e3c38b25
commit: abe3a2c9ead8fd95db141ea1df8d96c48cad3893 mwifiex: Use function to check whether interface type change is allowed
config: mips-randconfig-m031-20211104 (attached as .config)
compiler: mips-linux-gcc (GCC) 11.2.0

If you fix the issue, kindly add following tag as appropriate
Reported-by: kernel test robot <lkp@xxxxxxxxx>
Reported-by: Dan Carpenter <dan.carpenter@xxxxxxxxxx>

smatch warnings:
drivers/net/wireless/marvell/mwifiex/cfg80211.c:1307 mwifiex_cfg80211_change_virtual_intf() warn: ignoring unreachable code.

vim +1307 drivers/net/wireless/marvell/mwifiex/cfg80211.c

5e6e3a92b9a4c9 drivers/net/wireless/mwifiex/cfg80211.c Bing Zhao 2011-03-21 1176 static int
5e6e3a92b9a4c9 drivers/net/wireless/mwifiex/cfg80211.c Bing Zhao 2011-03-21 1177 mwifiex_cfg80211_change_virtual_intf(struct wiphy *wiphy,
5e6e3a92b9a4c9 drivers/net/wireless/mwifiex/cfg80211.c Bing Zhao 2011-03-21 1178 struct net_device *dev,
818a986e4ebace drivers/net/wireless/marvell/mwifiex/cfg80211.c Johannes Berg 2017-04-12 1179 enum nl80211_iftype type,
5e6e3a92b9a4c9 drivers/net/wireless/mwifiex/cfg80211.c Bing Zhao 2011-03-21 1180 struct vif_params *params)
5e6e3a92b9a4c9 drivers/net/wireless/mwifiex/cfg80211.c Bing Zhao 2011-03-21 1181 {
5e6e3a92b9a4c9 drivers/net/wireless/mwifiex/cfg80211.c Bing Zhao 2011-03-21 1182 struct mwifiex_private *priv = mwifiex_netdev_get_priv(dev);
047eaaf64503c2 drivers/net/wireless/mwifiex/cfg80211.c Avinash Patil 2015-01-28 1183 enum nl80211_iftype curr_iftype = dev->ieee80211_ptr->iftype;
5e6e3a92b9a4c9 drivers/net/wireless/mwifiex/cfg80211.c Bing Zhao 2011-03-21 1184
c61cfe49f0f0f0 drivers/net/wireless/marvell/mwifiex/cfg80211.c Limin Zhu 2017-11-30 1185 if (priv->scan_request) {
c61cfe49f0f0f0 drivers/net/wireless/marvell/mwifiex/cfg80211.c Limin Zhu 2017-11-30 1186 mwifiex_dbg(priv->adapter, ERROR,
c61cfe49f0f0f0 drivers/net/wireless/marvell/mwifiex/cfg80211.c Limin Zhu 2017-11-30 1187 "change virtual interface: scan in process\n");
c61cfe49f0f0f0 drivers/net/wireless/marvell/mwifiex/cfg80211.c Limin Zhu 2017-11-30 1188 return -EBUSY;
c61cfe49f0f0f0 drivers/net/wireless/marvell/mwifiex/cfg80211.c Limin Zhu 2017-11-30 1189 }
c61cfe49f0f0f0 drivers/net/wireless/marvell/mwifiex/cfg80211.c Limin Zhu 2017-11-30 1190
babe2a332dc40b drivers/net/wireless/marvell/mwifiex/cfg80211.c Jonas Dreßler 2021-09-14 1191 if (type == NL80211_IFTYPE_UNSPECIFIED) {
babe2a332dc40b drivers/net/wireless/marvell/mwifiex/cfg80211.c Jonas Dreßler 2021-09-14 1192 mwifiex_dbg(priv->adapter, INFO,
babe2a332dc40b drivers/net/wireless/marvell/mwifiex/cfg80211.c Jonas Dreßler 2021-09-14 1193 "%s: no new type specified, keeping old type %d\n",
babe2a332dc40b drivers/net/wireless/marvell/mwifiex/cfg80211.c Jonas Dreßler 2021-09-14 1194 dev->name, curr_iftype);
babe2a332dc40b drivers/net/wireless/marvell/mwifiex/cfg80211.c Jonas Dreßler 2021-09-14 1195 return 0;
babe2a332dc40b drivers/net/wireless/marvell/mwifiex/cfg80211.c Jonas Dreßler 2021-09-14 1196 }
babe2a332dc40b drivers/net/wireless/marvell/mwifiex/cfg80211.c Jonas Dreßler 2021-09-14 1197
babe2a332dc40b drivers/net/wireless/marvell/mwifiex/cfg80211.c Jonas Dreßler 2021-09-14 1198 if (curr_iftype == type) {
babe2a332dc40b drivers/net/wireless/marvell/mwifiex/cfg80211.c Jonas Dreßler 2021-09-14 1199 mwifiex_dbg(priv->adapter, INFO,
babe2a332dc40b drivers/net/wireless/marvell/mwifiex/cfg80211.c Jonas Dreßler 2021-09-14 1200 "%s: interface already is of type %d\n",
babe2a332dc40b drivers/net/wireless/marvell/mwifiex/cfg80211.c Jonas Dreßler 2021-09-14 1201 dev->name, curr_iftype);
babe2a332dc40b drivers/net/wireless/marvell/mwifiex/cfg80211.c Jonas Dreßler 2021-09-14 1202 return 0;
babe2a332dc40b drivers/net/wireless/marvell/mwifiex/cfg80211.c Jonas Dreßler 2021-09-14 1203 }
babe2a332dc40b drivers/net/wireless/marvell/mwifiex/cfg80211.c Jonas Dreßler 2021-09-14 1204
abe3a2c9ead8fd drivers/net/wireless/marvell/mwifiex/cfg80211.c Jonas Dreßler 2021-09-14 1205 if (!is_vif_type_change_allowed(priv->adapter, curr_iftype, type)) {
abe3a2c9ead8fd drivers/net/wireless/marvell/mwifiex/cfg80211.c Jonas Dreßler 2021-09-14 1206 mwifiex_dbg(priv->adapter, ERROR,
abe3a2c9ead8fd drivers/net/wireless/marvell/mwifiex/cfg80211.c Jonas Dreßler 2021-09-14 1207 "%s: change from type %d to %d is not allowed\n",
abe3a2c9ead8fd drivers/net/wireless/marvell/mwifiex/cfg80211.c Jonas Dreßler 2021-09-14 1208 dev->name, curr_iftype, type);
abe3a2c9ead8fd drivers/net/wireless/marvell/mwifiex/cfg80211.c Jonas Dreßler 2021-09-14 1209 return -EOPNOTSUPP;
abe3a2c9ead8fd drivers/net/wireless/marvell/mwifiex/cfg80211.c Jonas Dreßler 2021-09-14 1210 }
abe3a2c9ead8fd drivers/net/wireless/marvell/mwifiex/cfg80211.c Jonas Dreßler 2021-09-14 1211
047eaaf64503c2 drivers/net/wireless/mwifiex/cfg80211.c Avinash Patil 2015-01-28 1212 switch (curr_iftype) {
4f02341ac27f70 drivers/net/wireless/mwifiex/cfg80211.c Avinash Patil 2012-05-08 1213 case NL80211_IFTYPE_ADHOC:
4f02341ac27f70 drivers/net/wireless/mwifiex/cfg80211.c Avinash Patil 2012-05-08 1214 switch (type) {
4f02341ac27f70 drivers/net/wireless/mwifiex/cfg80211.c Avinash Patil 2012-05-08 1215 case NL80211_IFTYPE_STATION:
047eaaf64503c2 drivers/net/wireless/mwifiex/cfg80211.c Avinash Patil 2015-01-28 1216 priv->bss_mode = type;
047eaaf64503c2 drivers/net/wireless/mwifiex/cfg80211.c Avinash Patil 2015-01-28 1217 priv->sec_info.authentication_mode =
047eaaf64503c2 drivers/net/wireless/mwifiex/cfg80211.c Avinash Patil 2015-01-28 1218 NL80211_AUTHTYPE_OPEN_SYSTEM;
047eaaf64503c2 drivers/net/wireless/mwifiex/cfg80211.c Avinash Patil 2015-01-28 1219 dev->ieee80211_ptr->iftype = type;
047eaaf64503c2 drivers/net/wireless/mwifiex/cfg80211.c Avinash Patil 2015-01-28 1220 mwifiex_deauthenticate(priv, NULL);
047eaaf64503c2 drivers/net/wireless/mwifiex/cfg80211.c Avinash Patil 2015-01-28 1221 return mwifiex_send_cmd(priv, HostCmd_CMD_SET_BSS_MODE,
047eaaf64503c2 drivers/net/wireless/mwifiex/cfg80211.c Avinash Patil 2015-01-28 1222 HostCmd_ACT_GEN_SET, 0, NULL,
047eaaf64503c2 drivers/net/wireless/mwifiex/cfg80211.c Avinash Patil 2015-01-28 1223 true);
047eaaf64503c2 drivers/net/wireless/mwifiex/cfg80211.c Avinash Patil 2015-01-28 1224 case NL80211_IFTYPE_P2P_CLIENT:
047eaaf64503c2 drivers/net/wireless/mwifiex/cfg80211.c Avinash Patil 2015-01-28 1225 case NL80211_IFTYPE_P2P_GO:
047eaaf64503c2 drivers/net/wireless/mwifiex/cfg80211.c Avinash Patil 2015-01-28 1226 return mwifiex_change_vif_to_p2p(dev, curr_iftype,
818a986e4ebace drivers/net/wireless/marvell/mwifiex/cfg80211.c Johannes Berg 2017-04-12 1227 type, params);
047eaaf64503c2 drivers/net/wireless/mwifiex/cfg80211.c Avinash Patil 2015-01-28 1228 case NL80211_IFTYPE_AP:
047eaaf64503c2 drivers/net/wireless/mwifiex/cfg80211.c Avinash Patil 2015-01-28 1229 return mwifiex_change_vif_to_ap(dev, curr_iftype, type,
818a986e4ebace drivers/net/wireless/marvell/mwifiex/cfg80211.c Johannes Berg 2017-04-12 1230 params);
4f02341ac27f70 drivers/net/wireless/mwifiex/cfg80211.c Avinash Patil 2012-05-08 1231 default:
abe3a2c9ead8fd drivers/net/wireless/marvell/mwifiex/cfg80211.c Jonas Dreßler 2021-09-14 1232 goto errnotsupp;
eecd8250e492ff drivers/net/wireless/mwifiex/cfg80211.c Bing Zhao 2011-03-28 1233 }
abe3a2c9ead8fd drivers/net/wireless/marvell/mwifiex/cfg80211.c Jonas Dreßler 2021-09-14 1234
4f02341ac27f70 drivers/net/wireless/mwifiex/cfg80211.c Avinash Patil 2012-05-08 1235 case NL80211_IFTYPE_STATION:
5e6e3a92b9a4c9 drivers/net/wireless/mwifiex/cfg80211.c Bing Zhao 2011-03-21 1236 switch (type) {
5e6e3a92b9a4c9 drivers/net/wireless/mwifiex/cfg80211.c Bing Zhao 2011-03-21 1237 case NL80211_IFTYPE_ADHOC:
047eaaf64503c2 drivers/net/wireless/mwifiex/cfg80211.c Avinash Patil 2015-01-28 1238 priv->bss_mode = type;
047eaaf64503c2 drivers/net/wireless/mwifiex/cfg80211.c Avinash Patil 2015-01-28 1239 priv->sec_info.authentication_mode =
047eaaf64503c2 drivers/net/wireless/mwifiex/cfg80211.c Avinash Patil 2015-01-28 1240 NL80211_AUTHTYPE_OPEN_SYSTEM;
e1a2b7a394ad8c drivers/net/wireless/mwifiex/cfg80211.c Stone Piao 2012-09-25 1241 dev->ieee80211_ptr->iftype = type;
047eaaf64503c2 drivers/net/wireless/mwifiex/cfg80211.c Avinash Patil 2015-01-28 1242 mwifiex_deauthenticate(priv, NULL);
047eaaf64503c2 drivers/net/wireless/mwifiex/cfg80211.c Avinash Patil 2015-01-28 1243 return mwifiex_send_cmd(priv, HostCmd_CMD_SET_BSS_MODE,
047eaaf64503c2 drivers/net/wireless/mwifiex/cfg80211.c Avinash Patil 2015-01-28 1244 HostCmd_ACT_GEN_SET, 0, NULL,
047eaaf64503c2 drivers/net/wireless/mwifiex/cfg80211.c Avinash Patil 2015-01-28 1245 true);
047eaaf64503c2 drivers/net/wireless/mwifiex/cfg80211.c Avinash Patil 2015-01-28 1246 case NL80211_IFTYPE_P2P_CLIENT:
9197ab9e5f3016 drivers/net/wireless/mwifiex/cfg80211.c Stone Piao 2012-09-25 1247 case NL80211_IFTYPE_P2P_GO:
047eaaf64503c2 drivers/net/wireless/mwifiex/cfg80211.c Avinash Patil 2015-01-28 1248 return mwifiex_change_vif_to_p2p(dev, curr_iftype,
818a986e4ebace drivers/net/wireless/marvell/mwifiex/cfg80211.c Johannes Berg 2017-04-12 1249 type, params);
047eaaf64503c2 drivers/net/wireless/mwifiex/cfg80211.c Avinash Patil 2015-01-28 1250 case NL80211_IFTYPE_AP:
047eaaf64503c2 drivers/net/wireless/mwifiex/cfg80211.c Avinash Patil 2015-01-28 1251 return mwifiex_change_vif_to_ap(dev, curr_iftype, type,
818a986e4ebace drivers/net/wireless/marvell/mwifiex/cfg80211.c Johannes Berg 2017-04-12 1252 params);
4f02341ac27f70 drivers/net/wireless/mwifiex/cfg80211.c Avinash Patil 2012-05-08 1253 default:
abe3a2c9ead8fd drivers/net/wireless/marvell/mwifiex/cfg80211.c Jonas Dreßler 2021-09-14 1254 goto errnotsupp;
4f02341ac27f70 drivers/net/wireless/mwifiex/cfg80211.c Avinash Patil 2012-05-08 1255 }
abe3a2c9ead8fd drivers/net/wireless/marvell/mwifiex/cfg80211.c Jonas Dreßler 2021-09-14 1256
4f02341ac27f70 drivers/net/wireless/mwifiex/cfg80211.c Avinash Patil 2012-05-08 1257 case NL80211_IFTYPE_AP:
4f02341ac27f70 drivers/net/wireless/mwifiex/cfg80211.c Avinash Patil 2012-05-08 1258 switch (type) {
047eaaf64503c2 drivers/net/wireless/mwifiex/cfg80211.c Avinash Patil 2015-01-28 1259 case NL80211_IFTYPE_ADHOC:
047eaaf64503c2 drivers/net/wireless/mwifiex/cfg80211.c Avinash Patil 2015-01-28 1260 return mwifiex_change_vif_to_sta_adhoc(dev, curr_iftype,
818a986e4ebace drivers/net/wireless/marvell/mwifiex/cfg80211.c Johannes Berg 2017-04-12 1261 type, params);
047eaaf64503c2 drivers/net/wireless/mwifiex/cfg80211.c Avinash Patil 2015-01-28 1262 break;

Return followed by break.

047eaaf64503c2 drivers/net/wireless/mwifiex/cfg80211.c Avinash Patil 2015-01-28 1263 case NL80211_IFTYPE_P2P_CLIENT:
047eaaf64503c2 drivers/net/wireless/mwifiex/cfg80211.c Avinash Patil 2015-01-28 1264 case NL80211_IFTYPE_P2P_GO:
047eaaf64503c2 drivers/net/wireless/mwifiex/cfg80211.c Avinash Patil 2015-01-28 1265 return mwifiex_change_vif_to_p2p(dev, curr_iftype,
818a986e4ebace drivers/net/wireless/marvell/mwifiex/cfg80211.c Johannes Berg 2017-04-12 1266 type, params);
5e6e3a92b9a4c9 drivers/net/wireless/mwifiex/cfg80211.c Bing Zhao 2011-03-21 1267 default:
abe3a2c9ead8fd drivers/net/wireless/marvell/mwifiex/cfg80211.c Jonas Dreßler 2021-09-14 1268 goto errnotsupp;
4f02341ac27f70 drivers/net/wireless/mwifiex/cfg80211.c Avinash Patil 2012-05-08 1269 }
abe3a2c9ead8fd drivers/net/wireless/marvell/mwifiex/cfg80211.c Jonas Dreßler 2021-09-14 1270
e1a2b7a394ad8c drivers/net/wireless/mwifiex/cfg80211.c Stone Piao 2012-09-25 1271 case NL80211_IFTYPE_P2P_CLIENT:
9197ab9e5f3016 drivers/net/wireless/mwifiex/cfg80211.c Stone Piao 2012-09-25 1272 case NL80211_IFTYPE_P2P_GO:
e1a2b7a394ad8c drivers/net/wireless/mwifiex/cfg80211.c Stone Piao 2012-09-25 1273 switch (type) {
e1a2b7a394ad8c drivers/net/wireless/mwifiex/cfg80211.c Stone Piao 2012-09-25 1274 case NL80211_IFTYPE_STATION:
e79801ffe9c862 drivers/net/wireless/mwifiex/cfg80211.c Aniket Nagarnaik 2015-07-16 1275 if (mwifiex_cfg80211_deinit_p2p(priv))
e1a2b7a394ad8c drivers/net/wireless/mwifiex/cfg80211.c Stone Piao 2012-09-25 1276 return -EFAULT;
e79801ffe9c862 drivers/net/wireless/mwifiex/cfg80211.c Aniket Nagarnaik 2015-07-16 1277 priv->adapter->curr_iface_comb.p2p_intf--;
e79801ffe9c862 drivers/net/wireless/mwifiex/cfg80211.c Aniket Nagarnaik 2015-07-16 1278 priv->adapter->curr_iface_comb.sta_intf++;
e1a2b7a394ad8c drivers/net/wireless/mwifiex/cfg80211.c Stone Piao 2012-09-25 1279 dev->ieee80211_ptr->iftype = type;
3d8bd85c2c9e47 drivers/net/wireless/marvell/mwifiex/cfg80211.c Karthik D A 2016-09-28 1280 if (mwifiex_deinit_priv_params(priv))
3d8bd85c2c9e47 drivers/net/wireless/marvell/mwifiex/cfg80211.c Karthik D A 2016-09-28 1281 return -1;
3d8bd85c2c9e47 drivers/net/wireless/marvell/mwifiex/cfg80211.c Karthik D A 2016-09-28 1282 if (mwifiex_init_new_priv_params(priv, dev, type))
3d8bd85c2c9e47 drivers/net/wireless/marvell/mwifiex/cfg80211.c Karthik D A 2016-09-28 1283 return -1;
3d8bd85c2c9e47 drivers/net/wireless/marvell/mwifiex/cfg80211.c Karthik D A 2016-09-28 1284 if (mwifiex_sta_init_cmd(priv, false, false))
3d8bd85c2c9e47 drivers/net/wireless/marvell/mwifiex/cfg80211.c Karthik D A 2016-09-28 1285 return -1;
047eaaf64503c2 drivers/net/wireless/mwifiex/cfg80211.c Avinash Patil 2015-01-28 1286 break;

This break statement will break to the outside switch statement, fall
through to the default case statment, and goto errnotsupp. But probably
the intention was to "return 0;".

047eaaf64503c2 drivers/net/wireless/mwifiex/cfg80211.c Avinash Patil 2015-01-28 1287 case NL80211_IFTYPE_ADHOC:
047eaaf64503c2 drivers/net/wireless/mwifiex/cfg80211.c Avinash Patil 2015-01-28 1288 if (mwifiex_cfg80211_deinit_p2p(priv))
047eaaf64503c2 drivers/net/wireless/mwifiex/cfg80211.c Avinash Patil 2015-01-28 1289 return -EFAULT;
047eaaf64503c2 drivers/net/wireless/mwifiex/cfg80211.c Avinash Patil 2015-01-28 1290 return mwifiex_change_vif_to_sta_adhoc(dev, curr_iftype,
818a986e4ebace drivers/net/wireless/marvell/mwifiex/cfg80211.c Johannes Berg 2017-04-12 1291 type, params);
047eaaf64503c2 drivers/net/wireless/mwifiex/cfg80211.c Avinash Patil 2015-01-28 1292 break;

Return followed by break statement.

047eaaf64503c2 drivers/net/wireless/mwifiex/cfg80211.c Avinash Patil 2015-01-28 1293 case NL80211_IFTYPE_AP:
047eaaf64503c2 drivers/net/wireless/mwifiex/cfg80211.c Avinash Patil 2015-01-28 1294 if (mwifiex_cfg80211_deinit_p2p(priv))
047eaaf64503c2 drivers/net/wireless/mwifiex/cfg80211.c Avinash Patil 2015-01-28 1295 return -EFAULT;
047eaaf64503c2 drivers/net/wireless/mwifiex/cfg80211.c Avinash Patil 2015-01-28 1296 return mwifiex_change_vif_to_ap(dev, curr_iftype, type,
818a986e4ebace drivers/net/wireless/marvell/mwifiex/cfg80211.c Johannes Berg 2017-04-12 1297 params);
e1a2b7a394ad8c drivers/net/wireless/mwifiex/cfg80211.c Stone Piao 2012-09-25 1298 default:
abe3a2c9ead8fd drivers/net/wireless/marvell/mwifiex/cfg80211.c Jonas Dreßler 2021-09-14 1299 goto errnotsupp;
e1a2b7a394ad8c drivers/net/wireless/mwifiex/cfg80211.c Stone Piao 2012-09-25 1300 }
abe3a2c9ead8fd drivers/net/wireless/marvell/mwifiex/cfg80211.c Jonas Dreßler 2021-09-14 1301
4f02341ac27f70 drivers/net/wireless/mwifiex/cfg80211.c Avinash Patil 2012-05-08 1302 default:
abe3a2c9ead8fd drivers/net/wireless/marvell/mwifiex/cfg80211.c Jonas Dreßler 2021-09-14 1303 goto errnotsupp;
5e6e3a92b9a4c9 drivers/net/wireless/mwifiex/cfg80211.c Bing Zhao 2011-03-21 1304 }
5e6e3a92b9a4c9 drivers/net/wireless/mwifiex/cfg80211.c Bing Zhao 2011-03-21 1305
eecd8250e492ff drivers/net/wireless/mwifiex/cfg80211.c Bing Zhao 2011-03-28 1306
047eaaf64503c2 drivers/net/wireless/mwifiex/cfg80211.c Avinash Patil 2015-01-28 @1307 return 0;

Unreachable.

abe3a2c9ead8fd drivers/net/wireless/marvell/mwifiex/cfg80211.c Jonas Dreßler 2021-09-14 1308
abe3a2c9ead8fd drivers/net/wireless/marvell/mwifiex/cfg80211.c Jonas Dreßler 2021-09-14 1309 errnotsupp:
abe3a2c9ead8fd drivers/net/wireless/marvell/mwifiex/cfg80211.c Jonas Dreßler 2021-09-14 1310 mwifiex_dbg(priv->adapter, ERROR,
abe3a2c9ead8fd drivers/net/wireless/marvell/mwifiex/cfg80211.c Jonas Dreßler 2021-09-14 1311 "unsupported interface type transition: %d to %d\n",
abe3a2c9ead8fd drivers/net/wireless/marvell/mwifiex/cfg80211.c Jonas Dreßler 2021-09-14 1312 curr_iftype, type);
abe3a2c9ead8fd drivers/net/wireless/marvell/mwifiex/cfg80211.c Jonas Dreßler 2021-09-14 1313 return -EOPNOTSUPP;
5e6e3a92b9a4c9 drivers/net/wireless/mwifiex/cfg80211.c Bing Zhao 2011-03-21 1314 }
5e6e3a92b9a4c9 drivers/net/wireless/mwifiex/cfg80211.c Bing Zhao 2011-03-21 1315

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