[PATCH] libertas: fix a few wext abuses...

o SIOCGIWNAME is not designed to return the version number of the driver.
On the other hand, you are free to abuse SIOCGIWNICKN for that purpose.

o Don't attempt to fix the WE19/WE20 transition in the driver, because
your fixes are bogus, and redundant with the code in the kernel (you may
endup with +2, you can't read 32 char ESSID...).

o In SIOCSIWTXPOW, if you specified in iwrange that you want dBm, you
should only get dBm, which allow to reduce code bloat.
Signed-off-by: Jean Tourrilhes <jt@hpl.hp.com>
Signed-off-by: John W. Linville <linville@tuxdriver.com>

drivers/net/wireless/libertas/wext.c

@@ -21,52 +21,6 @@
 #include "assoc.h"
 
 
-/**
- *  @brief Convert mw value to dbm value
- *
- *  @param mw	   the value of mw
- *  @return 	   the value of dbm
- */
-static int mw_to_dbm(int mw)
-{
-	if (mw < 2)
-		return 0;
-	else if (mw < 3)
-		return 3;
-	else if (mw < 4)
-		return 5;
-	else if (mw < 6)
-		return 7;
-	else if (mw < 7)
-		return 8;
-	else if (mw < 8)
-		return 9;
-	else if (mw < 10)
-		return 10;
-	else if (mw < 13)
-		return 11;
-	else if (mw < 16)
-		return 12;
-	else if (mw < 20)
-		return 13;
-	else if (mw < 25)
-		return 14;
-	else if (mw < 32)
-		return 15;
-	else if (mw < 40)
-		return 16;
-	else if (mw < 50)
-		return 17;
-	else if (mw < 63)
-		return 18;
-	else if (mw < 79)
-		return 19;
-	else if (mw < 100)
-		return 20;
-	else
-		return 21;
-}
-
 /**
  *  @brief Find the channel frequency power info with specific channel
  *
@@ -199,28 +153,11 @@ static void copy_active_data_rates(wlan_adapter * adapter, u8 * rates)
 static int wlan_get_name(struct net_device *dev, struct iw_request_info *info,
 			 char *cwrq, char *extra)
 {
-	const char *cp;
-	char comm[6] = { "COMM-" };
-	char mrvl[6] = { "MRVL-" };
-	int cnt;
 
 	lbs_deb_enter(LBS_DEB_WEXT);
 
-	strcpy(cwrq, mrvl);
-
-	cp = strstr(libertas_driver_version, comm);
-	if (cp == libertas_driver_version)	//skip leading "COMM-"
-		cp = libertas_driver_version + strlen(comm);
-	else
-		cp = libertas_driver_version;
-
-	cnt = strlen(mrvl);
-	cwrq += cnt;
-	while (cnt < 16 && (*cp != '-')) {
-		*cwrq++ = toupper(*cp++);
-		cnt++;
-	}
-	*cwrq = '\0';
+	/* We could add support for 802.11n here as needed. Jean II */
+	snprintf(cwrq, IFNAMSIZ, "IEEE 802.11b/g");
 
 	lbs_deb_leave(LBS_DEB_WEXT);
 	return 0;
@@ -300,29 +237,37 @@ static int wlan_set_nick(struct net_device *dev, struct iw_request_info *info,
 static int wlan_get_nick(struct net_device *dev, struct iw_request_info *info,
 			 struct iw_point *dwrq, char *extra)
 {
-	wlan_private *priv = dev->priv;
-	wlan_adapter *adapter = priv->adapter;
+	const char *cp;
+	char comm[6] = { "COMM-" };
+	char mrvl[6] = { "MRVL-" };
+	int cnt;
 
 	lbs_deb_enter(LBS_DEB_WEXT);
 
 	/*
-	 * Get the Nick Name saved
+	 * Nick Name is not used internally in this mode,
+	 * therefore return something useful instead. Jean II
 	 */
 
-	mutex_lock(&adapter->lock);
-	strncpy(extra, adapter->nodename, 16);
-	mutex_unlock(&adapter->lock);
+	strcpy(extra, mrvl);
 
-	extra[16] = '\0';
+	cp = strstr(libertas_driver_version, comm);
+	if (cp == libertas_driver_version)	//skip leading "COMM-"
+		cp = libertas_driver_version + strlen(comm);
+	else
+		cp = libertas_driver_version;
 
-	/*
-	 * If none, we may want to get the one that was set
-	 */
+	cnt = strlen(mrvl);
+	extra += cnt;
+	while (cnt < 16 && (*cp != '-')) {
+		*extra++ = toupper(*cp++);
+		cnt++;
+	}
 
 	/*
 	 * Push it out !
 	 */
-	dwrq->length = strlen(extra) + 1;
+	dwrq->length = cnt;
 
 	lbs_deb_leave(LBS_DEB_WEXT);
 	return 0;
@@ -341,12 +286,12 @@ static int mesh_get_nick(struct net_device *dev, struct iw_request_info *info,
 	if (adapter->connect_status == LIBERTAS_CONNECTED) {
 		strncpy(extra, "Mesh", 12);
 		extra[12] = '\0';
-		dwrq->length = strlen(extra) + 1;
+		dwrq->length = strlen(extra);
 	}
 
 	else {
 		extra[0] = '\0';
-		dwrq->length = 1 ;
+		dwrq->length = 0;
 	}
 
 	lbs_deb_leave(LBS_DEB_WEXT);
@@ -1897,8 +1842,10 @@ static int wlan_set_txpow(struct net_device *dev, struct iw_request_info *info,
 
 	wlan_radio_ioctl(priv, RADIO_ON);
 
+	/* Userspace check in iwrange if it should use dBm or mW,
+	 * therefore this should never happen... Jean II */
 	if ((vwrq->flags & IW_TXPOW_TYPE) == IW_TXPOW_MWATT) {
-		dbm = (u16) mw_to_dbm(vwrq->value);
+		return -EOPNOTSUPP;
 	} else
 		dbm = (u16) vwrq->value;
 
@@ -1946,12 +1893,7 @@ static int wlan_get_essid(struct net_device *dev, struct iw_request_info *info,
 	 * If none, we may want to get the one that was set
 	 */
 
-	/* To make the driver backward compatible with WPA supplicant v0.2.4 */
-	if (dwrq->length == 32)	/* check with WPA supplicant buffer size */
-		dwrq->length = min_t(size_t, adapter->curbssparams.ssid_len,
-				   IW_ESSID_MAX_SIZE);
-	else
-		dwrq->length = adapter->curbssparams.ssid_len + 1;
+	dwrq->length = adapter->curbssparams.ssid_len;
 
 	dwrq->flags = 1;	/* active */
 
@@ -1972,14 +1914,6 @@ static int wlan_set_essid(struct net_device *dev, struct iw_request_info *info,
 
 	lbs_deb_enter(LBS_DEB_WEXT);
 
-	/*
-	 * WE-20 and earlier NULL pad the end of the SSID and increment
-	 * SSID length so it can be used like a string.  WE-21 and later don't,
-	 * but some userspace tools aren't able to cope with the change.
-	 */
-	if ((in_ssid_len > 0) && (extra[in_ssid_len - 1] == '\0'))
-		in_ssid_len--;
-
 	/* Check the size of the string */
 	if (in_ssid_len > IW_ESSID_MAX_SIZE) {
 		ret = -E2BIG;