wifi: cfg80211: Avoid clashing function prototypes

When built with Control Flow Integrity, function prototypes between
caller and function declaration must match. These mismatches are visible
at compile time with the new -Wcast-function-type-strict in Clang[1].

Fix a total of 73 warnings like these:

drivers/net/wireless/intersil/orinoco/wext.c:1379:27: warning: cast from 'int (*)(struct net_device *, struct iw_request_info *, struct iw_param *, char *)' to 'iw_handler' (aka 'int (*)(struct net_device *, struct iw_request_info *, union iwreq_data *, char *)') converts to incompatible function type [-Wcast-function-type-strict]
        IW_HANDLER(SIOCGIWPOWER,        (iw_handler)orinoco_ioctl_getpower),
                                        ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

../net/wireless/wext-compat.c:1607:33: warning: cast from 'int (*)(struct net_device *, struct iw_request_info *, struct iw_point *, char *)' to 'iw_handler' (aka 'int (*)(struct net_device *, struct iw_request_info *, union iwreq_data *, char *)') converts to incompatible function type [-Wcast-function-type-strict]
        [IW_IOCTL_IDX(SIOCSIWGENIE)]    = (iw_handler) cfg80211_wext_siwgenie,
                                          ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

../drivers/net/wireless/intersil/orinoco/wext.c:1390:27: error: incompatible function pointer types initializing 'const iw_handler' (aka 'int (*const)(struct net_device *, struct iw_request_info *, union iwreq_data *, char *)') with an expression of type 'int (struct net_device *, struct iw_request_info *, struct iw_param *, char *)' [-Wincompatible-function-pointer-types]
        IW_HANDLER(SIOCGIWRETRY,        cfg80211_wext_giwretry),
                                        ^~~~~~~~~~~~~~~~~~~~~~

The cfg80211 Wireless Extension handler callbacks (iw_handler) use a
union for the data argument. Actually use the union and perform explicit
member selection in the function body instead of having a function
prototype mismatch. There are no resulting binary differences
before/after changes.

These changes were made partly manually and partly with the help of
Coccinelle.

Link: https://github.com/KSPP/linux/issues/234
Link: https://reviews.llvm.org/D134831 [1]
Signed-off-by: Gustavo A. R. Silva <gustavoars@kernel.org>
Reviewed-by: Kees Cook <keescook@chromium.org>
Signed-off-by: Kalle Valo <kvalo@kernel.org>
Link: https://lore.kernel.org/r/a68822bf8dd587988131bb6a295280cb4293f05d.1667934775.git.gustavoars@kernel.org

7 files changed, 113 insertions, 127 deletions

diff --git a/drivers/net/wireless/intel/ipw2x00/ipw2200.c b/drivers/net/wireless/intel/ipw2x00/ipw2200.c
index 79d5c09757d4..ca802af8cddc 100644
--- a/drivers/net/wireless/intel/ipw2x00/ipw2200.c
+++ b/drivers/net/wireless/intel/ipw2x00/ipw2200.c
@@ -9856,7 +9856,7 @@ static int ipw_wx_sw_reset(struct net_device *dev,
 
 /* Rebase the WE IOCTLs to zero for the handler array */
 static iw_handler ipw_wx_handlers[] = {
-	IW_HANDLER(SIOCGIWNAME, (iw_handler)cfg80211_wext_giwname),
+	IW_HANDLER(SIOCGIWNAME, cfg80211_wext_giwname),
 	IW_HANDLER(SIOCSIWFREQ, ipw_wx_set_freq),
 	IW_HANDLER(SIOCGIWFREQ, ipw_wx_get_freq),
 	IW_HANDLER(SIOCSIWMODE, ipw_wx_set_mode),
diff --git a/drivers/net/wireless/intersil/orinoco/wext.c b/drivers/net/wireless/intersil/orinoco/wext.c
index b8eb5d60192f..dea1ff044342 100644
--- a/drivers/net/wireless/intersil/orinoco/wext.c
+++ b/drivers/net/wireless/intersil/orinoco/wext.c
@@ -1363,31 +1363,31 @@ static const struct iw_priv_args orinoco_privtab[] = {
 
 static const iw_handler	orinoco_handler[] = {
 	IW_HANDLER(SIOCSIWCOMMIT,	orinoco_ioctl_commit),
-	IW_HANDLER(SIOCGIWNAME,		(iw_handler)cfg80211_wext_giwname),
+	IW_HANDLER(SIOCGIWNAME,		cfg80211_wext_giwname),
 	IW_HANDLER(SIOCSIWFREQ,		orinoco_ioctl_setfreq),
 	IW_HANDLER(SIOCGIWFREQ,		orinoco_ioctl_getfreq),
-	IW_HANDLER(SIOCSIWMODE,		(iw_handler)cfg80211_wext_siwmode),
-	IW_HANDLER(SIOCGIWMODE,		(iw_handler)cfg80211_wext_giwmode),
+	IW_HANDLER(SIOCSIWMODE,		cfg80211_wext_siwmode),
+	IW_HANDLER(SIOCGIWMODE,		cfg80211_wext_giwmode),
 	IW_HANDLER(SIOCSIWSENS,		orinoco_ioctl_setsens),
 	IW_HANDLER(SIOCGIWSENS,		orinoco_ioctl_getsens),
-	IW_HANDLER(SIOCGIWRANGE,	(iw_handler)cfg80211_wext_giwrange),
+	IW_HANDLER(SIOCGIWRANGE,	cfg80211_wext_giwrange),
 	IW_HANDLER(SIOCSIWSPY,		iw_handler_set_spy),
 	IW_HANDLER(SIOCGIWSPY,		iw_handler_get_spy),
 	IW_HANDLER(SIOCSIWTHRSPY,	iw_handler_set_thrspy),
 	IW_HANDLER(SIOCGIWTHRSPY,	iw_handler_get_thrspy),
 	IW_HANDLER(SIOCSIWAP,		orinoco_ioctl_setwap),
 	IW_HANDLER(SIOCGIWAP,		orinoco_ioctl_getwap),
-	IW_HANDLER(SIOCSIWSCAN,		(iw_handler)cfg80211_wext_siwscan),
-	IW_HANDLER(SIOCGIWSCAN,		(iw_handler)cfg80211_wext_giwscan),
+	IW_HANDLER(SIOCSIWSCAN,		cfg80211_wext_siwscan),
+	IW_HANDLER(SIOCGIWSCAN,		cfg80211_wext_giwscan),
 	IW_HANDLER(SIOCSIWESSID,	orinoco_ioctl_setessid),
 	IW_HANDLER(SIOCGIWESSID,	orinoco_ioctl_getessid),
 	IW_HANDLER(SIOCSIWRATE,		orinoco_ioctl_setrate),
 	IW_HANDLER(SIOCGIWRATE,		orinoco_ioctl_getrate),
-	IW_HANDLER(SIOCSIWRTS,		(iw_handler)cfg80211_wext_siwrts),
-	IW_HANDLER(SIOCGIWRTS,		(iw_handler)cfg80211_wext_giwrts),
-	IW_HANDLER(SIOCSIWFRAG,		(iw_handler)cfg80211_wext_siwfrag),
-	IW_HANDLER(SIOCGIWFRAG,		(iw_handler)cfg80211_wext_giwfrag),
-	IW_HANDLER(SIOCGIWRETRY,	(iw_handler)cfg80211_wext_giwretry),
+	IW_HANDLER(SIOCSIWRTS,		cfg80211_wext_siwrts),
+	IW_HANDLER(SIOCGIWRTS,		cfg80211_wext_giwrts),
+	IW_HANDLER(SIOCSIWFRAG,		cfg80211_wext_siwfrag),
+	IW_HANDLER(SIOCGIWFRAG,		cfg80211_wext_giwfrag),
+	IW_HANDLER(SIOCGIWRETRY,	cfg80211_wext_giwretry),
 	IW_HANDLER(SIOCSIWENCODE,	orinoco_ioctl_setiwencode),
 	IW_HANDLER(SIOCGIWENCODE,	orinoco_ioctl_getiwencode),
 	IW_HANDLER(SIOCSIWPOWER,	orinoco_ioctl_setpower),
diff --git a/include/net/cfg80211-wext.h b/include/net/cfg80211-wext.h
index ad77caf2ffde..0ee36d97e068 100644
--- a/include/net/cfg80211-wext.h
+++ b/include/net/cfg80211-wext.h
@@ -19,34 +19,34 @@
  */
 int cfg80211_wext_giwname(struct net_device *dev,
 			  struct iw_request_info *info,
-			  char *name, char *extra);
+			  union iwreq_data *wrqu, char *extra);
 int cfg80211_wext_siwmode(struct net_device *dev, struct iw_request_info *info,
-			  u32 *mode, char *extra);
+			  union iwreq_data *wrqu, char *extra);
 int cfg80211_wext_giwmode(struct net_device *dev, struct iw_request_info *info,
-			  u32 *mode, char *extra);
+			  union iwreq_data *wrqu, char *extra);
 int cfg80211_wext_siwscan(struct net_device *dev,
 			  struct iw_request_info *info,
 			  union iwreq_data *wrqu, char *extra);
 int cfg80211_wext_giwscan(struct net_device *dev,
 			  struct iw_request_info *info,
-			  struct iw_point *data, char *extra);
+			  union iwreq_data *wrqu, char *extra);
 int cfg80211_wext_giwrange(struct net_device *dev,
 			   struct iw_request_info *info,
-			   struct iw_point *data, char *extra);
+			   union iwreq_data *wrqu, char *extra);
 int cfg80211_wext_siwrts(struct net_device *dev,
 			 struct iw_request_info *info,
-			 struct iw_param *rts, char *extra);
+			 union iwreq_data *wrqu, char *extra);
 int cfg80211_wext_giwrts(struct net_device *dev,
 			 struct iw_request_info *info,
-			 struct iw_param *rts, char *extra);
+			 union iwreq_data *wrqu, char *extra);
 int cfg80211_wext_siwfrag(struct net_device *dev,
 			  struct iw_request_info *info,
-			  struct iw_param *frag, char *extra);
+			  union iwreq_data *wrqu, char *extra);
 int cfg80211_wext_giwfrag(struct net_device *dev,
 			  struct iw_request_info *info,
-			  struct iw_param *frag, char *extra);
+			  union iwreq_data *wrqu, char *extra);
 int cfg80211_wext_giwretry(struct net_device *dev,
 			   struct iw_request_info *info,
-			   struct iw_param *retry, char *extra);
+			   union iwreq_data *wrqu, char *extra);
 
 #endif /* __NET_CFG80211_WEXT_H */
diff --git a/net/wireless/scan.c b/net/wireless/scan.c
index 806a5f1330ff..853619bc0f1a 100644
--- a/net/wireless/scan.c
+++ b/net/wireless/scan.c
@@ -3229,8 +3229,9 @@ static int ieee80211_scan_results(struct cfg80211_registered_device *rdev,
 
 int cfg80211_wext_giwscan(struct net_device *dev,
 			  struct iw_request_info *info,
-			  struct iw_point *data, char *extra)
+			  union iwreq_data *wrqu, char *extra)
 {
+	struct iw_point *data = &wrqu->data;
 	struct cfg80211_registered_device *rdev;
 	int res;
 
diff --git a/net/wireless/wext-compat.c b/net/wireless/wext-compat.c
index ddf340bfa07a..8a24dfca75af 100644
--- a/net/wireless/wext-compat.c
+++ b/net/wireless/wext-compat.c
@@ -25,16 +25,17 @@
 
 int cfg80211_wext_giwname(struct net_device *dev,
 			  struct iw_request_info *info,
-			  char *name, char *extra)
+			  union iwreq_data *wrqu, char *extra)
 {
-	strcpy(name, "IEEE 802.11");
+	strcpy(wrqu->name, "IEEE 802.11");
 	return 0;
 }
 EXPORT_WEXT_HANDLER(cfg80211_wext_giwname);
 
 int cfg80211_wext_siwmode(struct net_device *dev, struct iw_request_info *info,
-			  u32 *mode, char *extra)
+			  union iwreq_data *wrqu, char *extra)
 {
+	__u32 *mode = &wrqu->mode;
 	struct wireless_dev *wdev = dev->ieee80211_ptr;
 	struct cfg80211_registered_device *rdev;
 	struct vif_params vifparams;
@@ -71,8 +72,9 @@ int cfg80211_wext_siwmode(struct net_device *dev, struct iw_request_info *info,
 EXPORT_WEXT_HANDLER(cfg80211_wext_siwmode);
 
 int cfg80211_wext_giwmode(struct net_device *dev, struct iw_request_info *info,
-			  u32 *mode, char *extra)
+			  union iwreq_data *wrqu, char *extra)
 {
+	__u32 *mode = &wrqu->mode;
 	struct wireless_dev *wdev = dev->ieee80211_ptr;
 
 	if (!wdev)
@@ -108,8 +110,9 @@ EXPORT_WEXT_HANDLER(cfg80211_wext_giwmode);
 
 int cfg80211_wext_giwrange(struct net_device *dev,
 			   struct iw_request_info *info,
-			   struct iw_point *data, char *extra)
+			   union iwreq_data *wrqu, char *extra)
 {
+	struct iw_point *data = &wrqu->data;
 	struct wireless_dev *wdev = dev->ieee80211_ptr;
 	struct iw_range *range = (struct iw_range *) extra;
 	enum nl80211_band band;
@@ -251,8 +254,9 @@ int cfg80211_wext_freq(struct iw_freq *freq)
 
 int cfg80211_wext_siwrts(struct net_device *dev,
 			 struct iw_request_info *info,
-			 struct iw_param *rts, char *extra)
+			 union iwreq_data *wrqu, char *extra)
 {
+	struct iw_param *rts = &wrqu->rts;
 	struct wireless_dev *wdev = dev->ieee80211_ptr;
 	struct cfg80211_registered_device *rdev = wiphy_to_rdev(wdev->wiphy);
 	u32 orts = wdev->wiphy->rts_threshold;
@@ -281,8 +285,9 @@ EXPORT_WEXT_HANDLER(cfg80211_wext_siwrts);
 
 int cfg80211_wext_giwrts(struct net_device *dev,
 			 struct iw_request_info *info,
-			 struct iw_param *rts, char *extra)
+			 union iwreq_data *wrqu, char *extra)
 {
+	struct iw_param *rts = &wrqu->rts;
 	struct wireless_dev *wdev = dev->ieee80211_ptr;
 
 	rts->value = wdev->wiphy->rts_threshold;
@@ -295,8 +300,9 @@ EXPORT_WEXT_HANDLER(cfg80211_wext_giwrts);
 
 int cfg80211_wext_siwfrag(struct net_device *dev,
 			  struct iw_request_info *info,
-			  struct iw_param *frag, char *extra)
+			  union iwreq_data *wrqu, char *extra)
 {
+	struct iw_param *frag = &wrqu->frag;
 	struct wireless_dev *wdev = dev->ieee80211_ptr;
 	struct cfg80211_registered_device *rdev = wiphy_to_rdev(wdev->wiphy);
 	u32 ofrag = wdev->wiphy->frag_threshold;
@@ -325,8 +331,9 @@ EXPORT_WEXT_HANDLER(cfg80211_wext_siwfrag);
 
 int cfg80211_wext_giwfrag(struct net_device *dev,
 			  struct iw_request_info *info,
-			  struct iw_param *frag, char *extra)
+			  union iwreq_data *wrqu, char *extra)
 {
+	struct iw_param *frag = &wrqu->frag;
 	struct wireless_dev *wdev = dev->ieee80211_ptr;
 
 	frag->value = wdev->wiphy->frag_threshold;
@@ -339,8 +346,9 @@ EXPORT_WEXT_HANDLER(cfg80211_wext_giwfrag);
 
 static int cfg80211_wext_siwretry(struct net_device *dev,
 				  struct iw_request_info *info,
-				  struct iw_param *retry, char *extra)
+				  union iwreq_data *wrqu, char *extra)
 {
+	struct iw_param *retry = &wrqu->retry;
 	struct wireless_dev *wdev = dev->ieee80211_ptr;
 	struct cfg80211_registered_device *rdev = wiphy_to_rdev(wdev->wiphy);
 	u32 changed = 0;
@@ -378,8 +386,9 @@ static int cfg80211_wext_siwretry(struct net_device *dev,
 
 int cfg80211_wext_giwretry(struct net_device *dev,
 			   struct iw_request_info *info,
-			   struct iw_param *retry, char *extra)
+			   union iwreq_data *wrqu, char *extra)
 {
+	struct iw_param *retry = &wrqu->retry;
 	struct wireless_dev *wdev = dev->ieee80211_ptr;
 
 	retry->disabled = 0;
@@ -588,8 +597,9 @@ static int cfg80211_set_encryption(struct cfg80211_registered_device *rdev,
 
 static int cfg80211_wext_siwencode(struct net_device *dev,
 				   struct iw_request_info *info,
-				   struct iw_point *erq, char *keybuf)
+				   union iwreq_data *wrqu, char *keybuf)
 {
+	struct iw_point *erq = &wrqu->encoding;
 	struct wireless_dev *wdev = dev->ieee80211_ptr;
 	struct cfg80211_registered_device *rdev = wiphy_to_rdev(wdev->wiphy);
 	int idx, err;
@@ -664,8 +674,9 @@ out:
 
 static int cfg80211_wext_siwencodeext(struct net_device *dev,
 				      struct iw_request_info *info,
-				      struct iw_point *erq, char *extra)
+				      union iwreq_data *wrqu, char *extra)
 {
+	struct iw_point *erq = &wrqu->encoding;
 	struct wireless_dev *wdev = dev->ieee80211_ptr;
 	struct cfg80211_registered_device *rdev = wiphy_to_rdev(wdev->wiphy);
 	struct iw_encode_ext *ext = (struct iw_encode_ext *) extra;
@@ -767,8 +778,9 @@ static int cfg80211_wext_siwencodeext(struct net_device *dev,
 
 static int cfg80211_wext_giwencode(struct net_device *dev,
 				   struct iw_request_info *info,
-				   struct iw_point *erq, char *keybuf)
+				   union iwreq_data *wrqu, char *keybuf)
 {
+	struct iw_point *erq = &wrqu->encoding;
 	struct wireless_dev *wdev = dev->ieee80211_ptr;
 	int idx;
 
@@ -804,8 +816,9 @@ static int cfg80211_wext_giwencode(struct net_device *dev,
 
 static int cfg80211_wext_siwfreq(struct net_device *dev,
 				 struct iw_request_info *info,
-				 struct iw_freq *wextfreq, char *extra)
+				 union iwreq_data *wrqu, char *extra)
 {
+	struct iw_freq *wextfreq = &wrqu->freq;
 	struct wireless_dev *wdev = dev->ieee80211_ptr;
 	struct cfg80211_registered_device *rdev = wiphy_to_rdev(wdev->wiphy);
 	struct cfg80211_chan_def chandef = {
@@ -870,8 +883,9 @@ static int cfg80211_wext_siwfreq(struct net_device *dev,
 
 static int cfg80211_wext_giwfreq(struct net_device *dev,
 				 struct iw_request_info *info,
-				 struct iw_freq *freq, char *extra)
+				 union iwreq_data *wrqu, char *extra)
 {
+	struct iw_freq *freq = &wrqu->freq;
 	struct wireless_dev *wdev = dev->ieee80211_ptr;
 	struct cfg80211_registered_device *rdev = wiphy_to_rdev(wdev->wiphy);
 	struct cfg80211_chan_def chandef = {};
@@ -1147,8 +1161,9 @@ static int cfg80211_set_key_mgt(struct wireless_dev *wdev, u32 key_mgt)
 
 static int cfg80211_wext_siwauth(struct net_device *dev,
 				 struct iw_request_info *info,
-				 struct iw_param *data, char *extra)
+				 union iwreq_data *wrqu, char *extra)
 {
+	struct iw_param *data = &wrqu->param;
 	struct wireless_dev *wdev = dev->ieee80211_ptr;
 
 	if (wdev->iftype != NL80211_IFTYPE_STATION)
@@ -1180,7 +1195,7 @@ static int cfg80211_wext_siwauth(struct net_device *dev,
 
 static int cfg80211_wext_giwauth(struct net_device *dev,
 				 struct iw_request_info *info,
-				 struct iw_param *data, char *extra)
+				 union iwreq_data *wrqu, char *extra)
 {
 	/* XXX: what do we need? */
 
@@ -1189,8 +1204,9 @@ static int cfg80211_wext_giwauth(struct net_device *dev,
 
 static int cfg80211_wext_siwpower(struct net_device *dev,
 				  struct iw_request_info *info,
-				  struct iw_param *wrq, char *extra)
+				  union iwreq_data *wrqu, char *extra)
 {
+	struct iw_param *wrq = &wrqu->power;
 	struct wireless_dev *wdev = dev->ieee80211_ptr;
 	struct cfg80211_registered_device *rdev = wiphy_to_rdev(wdev->wiphy);
 	bool ps;
@@ -1238,8 +1254,9 @@ static int cfg80211_wext_siwpower(struct net_device *dev,
 
 static int cfg80211_wext_giwpower(struct net_device *dev,
 				  struct iw_request_info *info,
-				  struct iw_param *wrq, char *extra)
+				  union iwreq_data *wrqu, char *extra)
 {
+	struct iw_param *wrq = &wrqu->power;
 	struct wireless_dev *wdev = dev->ieee80211_ptr;
 
 	wrq->disabled = !wdev->ps;
@@ -1249,8 +1266,9 @@ static int cfg80211_wext_giwpower(struct net_device *dev,
 
 static int cfg80211_wext_siwrate(struct net_device *dev,
 				 struct iw_request_info *info,
-				 struct iw_param *rate, char *extra)
+				 union iwreq_data *wrqu, char *extra)
 {
+	struct iw_param *rate = &wrqu->bitrate;
 	struct wireless_dev *wdev = dev->ieee80211_ptr;
 	struct cfg80211_registered_device *rdev = wiphy_to_rdev(wdev->wiphy);
 	struct cfg80211_bitrate_mask mask;
@@ -1307,8 +1325,9 @@ static int cfg80211_wext_siwrate(struct net_device *dev,
 
 static int cfg80211_wext_giwrate(struct net_device *dev,
 				 struct iw_request_info *info,
-				 struct iw_param *rate, char *extra)
+				 union iwreq_data *wrqu, char *extra)
 {
+	struct iw_param *rate = &wrqu->bitrate;
 	struct wireless_dev *wdev = dev->ieee80211_ptr;
 	struct cfg80211_registered_device *rdev = wiphy_to_rdev(wdev->wiphy);
 	struct station_info sinfo = {};
@@ -1430,8 +1449,9 @@ static struct iw_statistics *cfg80211_wireless_stats(struct net_device *dev)
 
 static int cfg80211_wext_siwap(struct net_device *dev,
 			       struct iw_request_info *info,
-			       struct sockaddr *ap_addr, char *extra)
+			       union iwreq_data *wrqu, char *extra)
 {
+	struct sockaddr *ap_addr = &wrqu->ap_addr;
 	struct wireless_dev *wdev = dev->ieee80211_ptr;
 	struct cfg80211_registered_device *rdev = wiphy_to_rdev(wdev->wiphy);
 	int ret;
@@ -1455,8 +1475,9 @@ static int cfg80211_wext_siwap(struct net_device *dev,
 
 static int cfg80211_wext_giwap(struct net_device *dev,
 			       struct iw_request_info *info,
-			       struct sockaddr *ap_addr, char *extra)
+			       union iwreq_data *wrqu, char *extra)
 {
+	struct sockaddr *ap_addr = &wrqu->ap_addr;
 	struct wireless_dev *wdev = dev->ieee80211_ptr;
 	struct cfg80211_registered_device *rdev = wiphy_to_rdev(wdev->wiphy);
 	int ret;
@@ -1480,8 +1501,9 @@ static int cfg80211_wext_giwap(struct net_device *dev,
 
 static int cfg80211_wext_siwessid(struct net_device *dev,
 				  struct iw_request_info *info,
-				  struct iw_point *data, char *ssid)
+				  union iwreq_data *wrqu, char *ssid)
 {
+	struct iw_point *data = &wrqu->data;
 	struct wireless_dev *wdev = dev->ieee80211_ptr;
 	struct cfg80211_registered_device *rdev = wiphy_to_rdev(wdev->wiphy);
 	int ret;
@@ -1505,8 +1527,9 @@ static int cfg80211_wext_siwessid(struct net_device *dev,
 
 static int cfg80211_wext_giwessid(struct net_device *dev,
 				  struct iw_request_info *info,
-				  struct iw_point *data, char *ssid)
+				  union iwreq_data *wrqu, char *ssid)
 {
+	struct iw_point *data = &wrqu->data;
 	struct wireless_dev *wdev = dev->ieee80211_ptr;
 	struct cfg80211_registered_device *rdev = wiphy_to_rdev(wdev->wiphy);
 	int ret;
@@ -1533,7 +1556,7 @@ static int cfg80211_wext_giwessid(struct net_device *dev,
 
 static int cfg80211_wext_siwpmksa(struct net_device *dev,
 				  struct iw_request_info *info,
-				  struct iw_point *data, char *extra)
+				  union iwreq_data *wrqu, char *extra)
 {
 	struct wireless_dev *wdev = dev->ieee80211_ptr;
 	struct cfg80211_registered_device *rdev = wiphy_to_rdev(wdev->wiphy);
@@ -1584,78 +1607,39 @@ static int cfg80211_wext_siwpmksa(struct net_device *dev,
 	return ret;
 }
 
-#define DEFINE_WEXT_COMPAT_STUB(func, type)			\
-	static int __ ## func(struct net_device *dev,		\
-			      struct iw_request_info *info,	\
-			      union iwreq_data *wrqu,		\
-			      char *extra)			\
-	{							\
-		return func(dev, info, (type *)wrqu, extra);	\
-	}
-
-DEFINE_WEXT_COMPAT_STUB(cfg80211_wext_giwname, char)
-DEFINE_WEXT_COMPAT_STUB(cfg80211_wext_siwfreq, struct iw_freq)
-DEFINE_WEXT_COMPAT_STUB(cfg80211_wext_giwfreq, struct iw_freq)
-DEFINE_WEXT_COMPAT_STUB(cfg80211_wext_siwmode, u32)
-DEFINE_WEXT_COMPAT_STUB(cfg80211_wext_giwmode, u32)
-DEFINE_WEXT_COMPAT_STUB(cfg80211_wext_giwrange, struct iw_point)
-DEFINE_WEXT_COMPAT_STUB(cfg80211_wext_siwap, struct sockaddr)
-DEFINE_WEXT_COMPAT_STUB(cfg80211_wext_giwap, struct sockaddr)
-DEFINE_WEXT_COMPAT_STUB(cfg80211_wext_siwmlme, struct iw_point)
-DEFINE_WEXT_COMPAT_STUB(cfg80211_wext_giwscan, struct iw_point)
-DEFINE_WEXT_COMPAT_STUB(cfg80211_wext_siwessid, struct iw_point)
-DEFINE_WEXT_COMPAT_STUB(cfg80211_wext_giwessid, struct iw_point)
-DEFINE_WEXT_COMPAT_STUB(cfg80211_wext_siwrate, struct iw_param)
-DEFINE_WEXT_COMPAT_STUB(cfg80211_wext_giwrate, struct iw_param)
-DEFINE_WEXT_COMPAT_STUB(cfg80211_wext_siwrts, struct iw_param)
-DEFINE_WEXT_COMPAT_STUB(cfg80211_wext_giwrts, struct iw_param)
-DEFINE_WEXT_COMPAT_STUB(cfg80211_wext_siwfrag, struct iw_param)
-DEFINE_WEXT_COMPAT_STUB(cfg80211_wext_giwfrag, struct iw_param)
-DEFINE_WEXT_COMPAT_STUB(cfg80211_wext_siwretry, struct iw_param)
-DEFINE_WEXT_COMPAT_STUB(cfg80211_wext_giwretry, struct iw_param)
-DEFINE_WEXT_COMPAT_STUB(cfg80211_wext_siwencode, struct iw_point)
-DEFINE_WEXT_COMPAT_STUB(cfg80211_wext_giwencode, struct iw_point)
-DEFINE_WEXT_COMPAT_STUB(cfg80211_wext_giwpower, struct iw_param)
-DEFINE_WEXT_COMPAT_STUB(cfg80211_wext_siwpower, struct iw_param)
-DEFINE_WEXT_COMPAT_STUB(cfg80211_wext_siwgenie, struct iw_point)
-DEFINE_WEXT_COMPAT_STUB(cfg80211_wext_giwauth, struct iw_param)
-DEFINE_WEXT_COMPAT_STUB(cfg80211_wext_siwauth, struct iw_param)
-DEFINE_WEXT_COMPAT_STUB(cfg80211_wext_siwencodeext, struct iw_point)
-DEFINE_WEXT_COMPAT_STUB(cfg80211_wext_siwpmksa, struct iw_point)
-
 static const iw_handler cfg80211_handlers[] = {
-	[IW_IOCTL_IDX(SIOCGIWNAME)]	= __cfg80211_wext_giwname,
-	[IW_IOCTL_IDX(SIOCSIWFREQ)]	= __cfg80211_wext_siwfreq,
-	[IW_IOCTL_IDX(SIOCGIWFREQ)]	= __cfg80211_wext_giwfreq,
-	[IW_IOCTL_IDX(SIOCSIWMODE)]	= __cfg80211_wext_siwmode,
-	[IW_IOCTL_IDX(SIOCGIWMODE)]	= __cfg80211_wext_giwmode,
-	[IW_IOCTL_IDX(SIOCGIWRANGE)]	= __cfg80211_wext_giwrange,
-	[IW_IOCTL_IDX(SIOCSIWAP)]	= __cfg80211_wext_siwap,
-	[IW_IOCTL_IDX(SIOCGIWAP)]	= __cfg80211_wext_giwap,
-	[IW_IOCTL_IDX(SIOCSIWMLME)]	= __cfg80211_wext_siwmlme,
-	[IW_IOCTL_IDX(SIOCSIWSCAN)]	= cfg80211_wext_siwscan,
-	[IW_IOCTL_IDX(SIOCGIWSCAN)]	= __cfg80211_wext_giwscan,
-	[IW_IOCTL_IDX(SIOCSIWESSID)]	= __cfg80211_wext_siwessid,
-	[IW_IOCTL_IDX(SIOCGIWESSID)]	= __cfg80211_wext_giwessid,
-	[IW_IOCTL_IDX(SIOCSIWRATE)]	= __cfg80211_wext_siwrate,
-	[IW_IOCTL_IDX(SIOCGIWRATE)]	= __cfg80211_wext_giwrate,
-	[IW_IOCTL_IDX(SIOCSIWRTS)]	= __cfg80211_wext_siwrts,
-	[IW_IOCTL_IDX(SIOCGIWRTS)]	= __cfg80211_wext_giwrts,
-	[IW_IOCTL_IDX(SIOCSIWFRAG)]	= __cfg80211_wext_siwfrag,
-	[IW_IOCTL_IDX(SIOCGIWFRAG)]	= __cfg80211_wext_giwfrag,
-	[IW_IOCTL_IDX(SIOCSIWTXPOW)]	= cfg80211_wext_siwtxpower,
-	[IW_IOCTL_IDX(SIOCGIWTXPOW)]	= cfg80211_wext_giwtxpower,
-	[IW_IOCTL_IDX(SIOCSIWRETRY)]	= __cfg80211_wext_siwretry,
-	[IW_IOCTL_IDX(SIOCGIWRETRY)]	= __cfg80211_wext_giwretry,
-	[IW_IOCTL_IDX(SIOCSIWENCODE)]	= __cfg80211_wext_siwencode,
-	[IW_IOCTL_IDX(SIOCGIWENCODE)]	= __cfg80211_wext_giwencode,
-	[IW_IOCTL_IDX(SIOCSIWPOWER)]	= __cfg80211_wext_siwpower,
-	[IW_IOCTL_IDX(SIOCGIWPOWER)]	= __cfg80211_wext_giwpower,
-	[IW_IOCTL_IDX(SIOCSIWGENIE)]	= __cfg80211_wext_siwgenie,
-	[IW_IOCTL_IDX(SIOCSIWAUTH)]	= __cfg80211_wext_siwauth,
-	[IW_IOCTL_IDX(SIOCGIWAUTH)]	= __cfg80211_wext_giwauth,
-	[IW_IOCTL_IDX(SIOCSIWENCODEEXT)]= __cfg80211_wext_siwencodeext,
-	[IW_IOCTL_IDX(SIOCSIWPMKSA)]	= __cfg80211_wext_siwpmksa,
+	IW_HANDLER(SIOCGIWNAME,		cfg80211_wext_giwname),
+	IW_HANDLER(SIOCSIWFREQ,		cfg80211_wext_siwfreq),
+	IW_HANDLER(SIOCGIWFREQ,		cfg80211_wext_giwfreq),
+	IW_HANDLER(SIOCSIWMODE,		cfg80211_wext_siwmode),
+	IW_HANDLER(SIOCGIWMODE,		cfg80211_wext_giwmode),
+	IW_HANDLER(SIOCGIWRANGE,	cfg80211_wext_giwrange),
+	IW_HANDLER(SIOCSIWAP,		cfg80211_wext_siwap),
+	IW_HANDLER(SIOCGIWAP,		cfg80211_wext_giwap),
+	IW_HANDLER(SIOCSIWMLME,		cfg80211_wext_siwmlme),
+	IW_HANDLER(SIOCSIWSCAN,		cfg80211_wext_siwscan),
+	IW_HANDLER(SIOCGIWSCAN,		cfg80211_wext_giwscan),
+	IW_HANDLER(SIOCSIWESSID,	cfg80211_wext_siwessid),
+	IW_HANDLER(SIOCGIWESSID,	cfg80211_wext_giwessid),
+	IW_HANDLER(SIOCSIWRATE,		cfg80211_wext_siwrate),
+	IW_HANDLER(SIOCGIWRATE,		cfg80211_wext_giwrate),
+	IW_HANDLER(SIOCSIWRTS,		cfg80211_wext_siwrts),
+	IW_HANDLER(SIOCGIWRTS,		cfg80211_wext_giwrts),
+	IW_HANDLER(SIOCSIWFRAG,		cfg80211_wext_siwfrag),
+	IW_HANDLER(SIOCGIWFRAG,		cfg80211_wext_giwfrag),
+	IW_HANDLER(SIOCSIWTXPOW,	cfg80211_wext_siwtxpower),
+	IW_HANDLER(SIOCGIWTXPOW,	cfg80211_wext_giwtxpower),
+	IW_HANDLER(SIOCSIWRETRY,	cfg80211_wext_siwretry),
+	IW_HANDLER(SIOCGIWRETRY,	cfg80211_wext_giwretry),
+	IW_HANDLER(SIOCSIWENCODE,	cfg80211_wext_siwencode),
+	IW_HANDLER(SIOCGIWENCODE,	cfg80211_wext_giwencode),
+	IW_HANDLER(SIOCSIWPOWER,	cfg80211_wext_siwpower),
+	IW_HANDLER(SIOCGIWPOWER,	cfg80211_wext_giwpower),
+	IW_HANDLER(SIOCSIWGENIE,	cfg80211_wext_siwgenie),
+	IW_HANDLER(SIOCSIWAUTH,		cfg80211_wext_siwauth),
+	IW_HANDLER(SIOCGIWAUTH,		cfg80211_wext_giwauth),
+	IW_HANDLER(SIOCSIWENCODEEXT,	cfg80211_wext_siwencodeext),
+	IW_HANDLER(SIOCSIWPMKSA,	cfg80211_wext_siwpmksa),
 };
 
 const struct iw_handler_def cfg80211_wext_handler = {
diff --git a/net/wireless/wext-compat.h b/net/wireless/wext-compat.h
index 8d3cc1552e2f..c02eb789e676 100644
--- a/net/wireless/wext-compat.h
+++ b/net/wireless/wext-compat.h
@@ -13,7 +13,7 @@
 
 int cfg80211_ibss_wext_siwfreq(struct net_device *dev,
 			       struct iw_request_info *info,
-			       struct iw_freq *freq, char *extra);
+			       struct iw_freq *wextfreq, char *extra);
 int cfg80211_ibss_wext_giwfreq(struct net_device *dev,
 			       struct iw_request_info *info,
 			       struct iw_freq *freq, char *extra);
@@ -32,7 +32,7 @@ int cfg80211_ibss_wext_giwessid(struct net_device *dev,
 
 int cfg80211_mgd_wext_siwfreq(struct net_device *dev,
 			      struct iw_request_info *info,
-			      struct iw_freq *freq, char *extra);
+			      struct iw_freq *wextfreq, char *extra);
 int cfg80211_mgd_wext_giwfreq(struct net_device *dev,
 			      struct iw_request_info *info,
 			      struct iw_freq *freq, char *extra);
@@ -51,10 +51,10 @@ int cfg80211_mgd_wext_giwessid(struct net_device *dev,
 
 int cfg80211_wext_siwmlme(struct net_device *dev,
 			  struct iw_request_info *info,
-			  struct iw_point *data, char *extra);
+			  union iwreq_data *wrqu, char *extra);
 int cfg80211_wext_siwgenie(struct net_device *dev,
 			   struct iw_request_info *info,
-			   struct iw_point *data, char *extra);
+			   union iwreq_data *wrqu, char *extra);
 
 
 int cfg80211_wext_freq(struct iw_freq *freq);
diff --git a/net/wireless/wext-sme.c b/net/wireless/wext-sme.c
index 68f45afc352d..191c6d98c700 100644
--- a/net/wireless/wext-sme.c
+++ b/net/wireless/wext-sme.c
@@ -324,8 +324,9 @@ int cfg80211_mgd_wext_giwap(struct net_device *dev,
 
 int cfg80211_wext_siwgenie(struct net_device *dev,
 			   struct iw_request_info *info,
-			   struct iw_point *data, char *extra)
+			   union iwreq_data *wrqu, char *extra)
 {
+	struct iw_point *data = &wrqu->data;
 	struct wireless_dev *wdev = dev->ieee80211_ptr;
 	struct cfg80211_registered_device *rdev = wiphy_to_rdev(wdev->wiphy);
 	u8 *ie = extra;
@@ -374,7 +375,7 @@ int cfg80211_wext_siwgenie(struct net_device *dev,
 
 int cfg80211_wext_siwmlme(struct net_device *dev,
 			  struct iw_request_info *info,
-			  struct iw_point *data, char *extra)
+			  union iwreq_data *wrqu, char *extra)
 {
 	struct wireless_dev *wdev = dev->ieee80211_ptr;
 	struct iw_mlme *mlme = (struct iw_mlme *)extra;