o wl3501: implement get frag threshold wireless extension

drivers/net/wireless/wl3501_cs.c

@@ -2088,6 +2088,22 @@ static int wl3501_get_rts_threshold(struct net_device *dev,
 	return rc;
 }
 
+static int wl3501_get_frag_threshold(struct net_device *dev,
+				     struct iw_request_info *info,
+				     union iwreq_data *wrqu, char *extra)
+{
+	u16 threshold;
+	struct wl3501_card *this = (struct wl3501_card *)dev->priv;
+	int rc = wl3501_get_mib_value(this, WL3501_MIB_ATTR_FRAG_THRESHOLD,
+				      &threshold, sizeof(threshold));
+	if (!rc) {
+		wrqu->frag.value = threshold;
+		wrqu->frag.disabled = threshold >= 2346;
+		wrqu->frag.fixed = 1;
+	}
+	return rc;
+}
+
 static const iw_handler	wl3501_handler[] = {
 	[SIOCGIWNAME	- SIOCIWFIRST] = wl3501_get_name,
 	[SIOCSIWFREQ	- SIOCIWFIRST] = wl3501_set_freq,
@@ -2108,6 +2124,7 @@ static const iw_handler	wl3501_handler[] = {
 	[SIOCGIWNICKN	- SIOCIWFIRST] = wl3501_get_nick,
 	[SIOCGIWRATE	- SIOCIWFIRST] = wl3501_get_rate,
 	[SIOCGIWRTS	- SIOCIWFIRST] = wl3501_get_rts_threshold,
+	[SIOCGIWFRAG	- SIOCIWFIRST] = wl3501_get_frag_threshold,
 };
 
 static const struct iw_handler_def wl3501_handler_def = {