wl1271: workaround to send a disconnect before rejoining

We don't get any indication from the stack when we have disassociated.  In
wl1271, it is important to send a CMD_DISCONNECT before joining again,
because the firmware cleans some things up.  So we check if we're already
joined and disconnect if that's the case.
Signed-off-by: Luciano Coelho <luciano.coelho@nokia.com>
Reviewed-by: Juuso Oikarinen <juuso.oikarinen@nokia.com>
Signed-off-by: John W. Linville <linville@tuxdriver.com>

drivers/net/wireless/wl12xx/wl1271.h

@@ -422,6 +422,9 @@ struct wl1271 {
 	struct wl1271_tx_hw_res_if *tx_res_if;
 
 	struct ieee80211_vif *vif;
+
+	/* Used for a workaround to send disconnect before rejoining */
+	bool joined;
 };
 
 int wl1271_plt_start(struct wl1271 *wl);

drivers/net/wireless/wl12xx/wl1271_cmd.c

@@ -191,6 +191,19 @@ int wl1271_cmd_join(struct wl1271 *wl)
 			do_cal = false;
 	}
 
+	/* FIXME: This is a workaround, because with the current stack, we
+	 * cannot know when we have disassociated.  So, if we have already
+	 * joined, we disconnect before joining again. */
+	if (wl->joined) {
+		ret = wl1271_cmd_disconnect(wl);
+		if (ret < 0) {
+			wl1271_error("failed to disconnect before rejoining");
+			goto out;
+		}
+
+		wl->joined = false;
+	}
+
 	join = kzalloc(sizeof(*join), GFP_KERNEL);
 	if (!join) {
 		ret = -ENOMEM;
@@ -245,6 +258,8 @@ int wl1271_cmd_join(struct wl1271 *wl)
 		goto out_free;
 	}
 
+	wl->joined = true;
+
 	/*
 	 * ugly hack: we should wait for JOIN_EVENT_COMPLETE_ID but to
 	 * simplify locking we just sleep instead, for now

drivers/net/wireless/wl12xx/wl1271_main.c

@@ -648,6 +648,8 @@ static void wl1271_op_stop(struct ieee80211_hw *hw)
 	wl->tx_security_seq_32 = 0;
 	wl->time_offset = 0;
 	wl->session_counter = 0;
+	wl->joined = false;
+
 	for (i = 0; i < NUM_TX_QUEUES; i++)
 		wl->tx_blocks_freed[i] = 0;
 
@@ -1395,6 +1397,7 @@ static int __devinit wl1271_probe(struct spi_device *spi)
 	wl->basic_rate_set = WL1271_DEFAULT_BASIC_RATE_SET;
 	wl->band = IEEE80211_BAND_2GHZ;
 	wl->vif = NULL;
+	wl->joined = false;
 
 	for (i = 0; i < ACX_TX_DESCRIPTORS; i++)
 		wl->tx_frames[i] = NULL;