wl1271: Fix ad-hoc mode neighborhood detection

This patch fixes a bug in ad-hoc mode preventing mac80211 from properly
detecting other ad-hoc networks with the same SSID.
Signed-off-by: Juuso Oikarinen <juuso.oikarinen@nokia.com>
Reviewed-by: Kalle Valo <kalle.valo@nokia.com>
Signed-off-by: John W. Linville <linville@tuxdriver.com>

drivers/net/wireless/wl12xx/wl1271_cmd.c

@@ -247,7 +247,7 @@ int wl1271_cmd_radio_parms(struct wl1271 *wl)
 	return ret;
 }
 
-int wl1271_cmd_join(struct wl1271 *wl)
+int wl1271_cmd_join(struct wl1271 *wl, u8 bss_type)
 {
 	static bool do_cal = true;
 	struct wl1271_cmd_join *join;
@@ -278,7 +278,7 @@ int wl1271_cmd_join(struct wl1271 *wl)
 
 	join->rx_config_options = cpu_to_le32(wl->rx_config);
 	join->rx_filter_options = cpu_to_le32(wl->rx_filter);
-	join->bss_type = wl->bss_type;
+	join->bss_type = bss_type;
 
 	/*
 	 * FIXME: disable temporarily all filters because after commit

drivers/net/wireless/wl12xx/wl1271_cmd.h

@@ -33,7 +33,7 @@ int wl1271_cmd_send(struct wl1271 *wl, u16 id, void *buf, size_t len,
 		    size_t res_len);
 int wl1271_cmd_general_parms(struct wl1271 *wl);
 int wl1271_cmd_radio_parms(struct wl1271 *wl);
-int wl1271_cmd_join(struct wl1271 *wl);
+int wl1271_cmd_join(struct wl1271 *wl, u8 bss_type);
 int wl1271_cmd_test(struct wl1271 *wl, void *buf, size_t buf_len, u8 answer);
 int wl1271_cmd_interrogate(struct wl1271 *wl, u16 id, void *buf, size_t len);
 int wl1271_cmd_configure(struct wl1271 *wl, u16 id, void *buf, size_t len);

drivers/net/wireless/wl12xx/wl1271_main.c

@@ -1093,7 +1093,7 @@ static int wl1271_op_config_interface(struct ieee80211_hw *hw,
 
 		memcpy(wl->bssid, conf->bssid, ETH_ALEN);
 
-		ret = wl1271_cmd_join(wl);
+		ret = wl1271_cmd_join(wl, wl->bss_type);
 		if (ret < 0)
 			goto out_sleep;
 
@@ -1142,17 +1142,16 @@ static int wl1271_join_channel(struct wl1271 *wl, int channel)
 	static const u8 dummy_bssid[ETH_ALEN] = { 0x0b, 0xad, 0xde,
 						  0xad, 0xbe, 0xef };
 
-	/* the dummy join is not required for ad-hoc */
-	if (wl->bss_type == BSS_TYPE_IBSS)
-		goto out;
-
 	/* disable mac filter, so we hear everything */
 	wl->rx_config &= ~CFG_BSSID_FILTER_EN;
 
 	wl->channel = channel;
 	memcpy(wl->bssid, dummy_bssid, ETH_ALEN);
 
-	ret = wl1271_cmd_join(wl);
+	/* the dummy join is performed always with STATION BSS type to allow
+	   also ad-hoc mode to listen to the surroundings without sending any
+	   beacons yet. */
+	ret = wl1271_cmd_join(wl, BSS_TYPE_STA_BSS);
 	if (ret < 0)
 		goto out;
 
@@ -1221,7 +1220,7 @@ static int wl1271_op_config(struct ieee80211_hw *hw, u32 changed)
 	    test_bit(WL1271_FLAG_JOINED, &wl->flags)) {
 		wl->channel = channel;
 		/* FIXME: maybe use CMD_CHANNEL_SWITCH for this? */
-		ret = wl1271_cmd_join(wl);
+		ret = wl1271_cmd_join(wl, wl->bss_type);
 		if (ret < 0)
 			wl1271_warning("cmd join to update channel failed %d",
 				       ret);
@@ -1704,7 +1703,7 @@ static void wl1271_op_bss_info_changed(struct ieee80211_hw *hw,
 	}
 
 	if (do_join) {
-		ret = wl1271_cmd_join(wl);
+		ret = wl1271_cmd_join(wl, wl->bss_type);
 		if (ret < 0) {
 			wl1271_warning("cmd join failed %d", ret);
 			goto out_sleep;