libertas: don't depend on IEEE80211

Runtime-wise we only need escape_ssid from the deprecated IEEE80211
subsystem. However, it's easy to provide our own copy.
Signed-off-by: NHolger Schurig <hs4233@mail.mn-solutions.de>
Acked-by: NDan Williams <dcbw@redhat.com>
Signed-off-by: NJohn W. Linville <linville@tuxdriver.com>

drivers/net/wireless/Kconfig

@@ -271,7 +271,6 @@ config LIBERTAS
 	tristate "Marvell 8xxx Libertas WLAN driver support"
 	depends on WLAN_80211
 	select WIRELESS_EXT
-	select IEEE80211
 	select FW_LOADER
 	---help---
 	  A library for Marvell Libertas 8xxx devices.

drivers/net/wireless/libertas/decl.h

@@ -71,4 +71,9 @@ int lbs_stop_card(struct lbs_private *priv);
 void lbs_host_to_card_done(struct lbs_private *priv);
 
 int lbs_update_channel(struct lbs_private *priv);
+
+#ifndef CONFIG_IEEE80211
+const char *escape_essid(const char *essid, u8 essid_len);
+#endif
+
 #endif

drivers/net/wireless/libertas/main.c

@@ -1559,6 +1559,32 @@ static int lbs_add_rtap(struct lbs_private *priv)
 	return ret;
 }
 
+#ifndef CONFIG_IEEE80211
+const char *escape_essid(const char *essid, u8 essid_len)
+{
+	static char escaped[IW_ESSID_MAX_SIZE * 2 + 1];
+	const char *s = essid;
+	char *d = escaped;
+
+	if (ieee80211_is_empty_essid(essid, essid_len)) {
+		memcpy(escaped, "<hidden>", sizeof("<hidden>"));
+		return escaped;
+	}
+
+	essid_len = min(essid_len, (u8) IW_ESSID_MAX_SIZE);
+	while (essid_len--) {
+		if (*s == '\0') {
+			*d++ = '\\';
+			*d++ = '0';
+			s++;
+		} else {
+			*d++ = *s++;
+		}
+	}
+	*d = '\0';
+	return escaped;
+}
+#endif
 
 module_init(lbs_init_module);
 module_exit(lbs_exit_module);