wl12xx: use freezable workqueue for netstack_work

When resuming (after wowlan), we want the rx packets (which is
usually the wake-up packet itself) to be passed to mac80211 only
after the resume notifier was completed, and mac80211 is up and
running (otherwise, the packets will be dropped).

By enqueueing the netstack_work to a freezable workqueue, we can
guarantee the rx processing to occur only after mac80211 was resumed.
Signed-off-by: Eliad Peller <eliad@wizery.com>
Signed-off-by: Ido Yariv <ido@wizery.com>
Signed-off-by: Luciano Coelho <coelho@ti.com>

drivers/net/wireless/wl12xx/main.c

@@ -4138,6 +4138,12 @@ struct ieee80211_hw *wl1271_alloc_hw(void)
 	INIT_WORK(&wl->rx_streaming_disable_work,
 		  wl1271_rx_streaming_disable_work);
 
+	wl->freezable_wq = create_freezable_workqueue("wl12xx_wq");
+	if (!wl->freezable_wq) {
+		ret = -ENOMEM;
+		goto err_hw;
+	}
+
 	wl->channel = WL1271_DEFAULT_CHANNEL;
 	wl->beacon_int = WL1271_DEFAULT_BEACON_INT;
 	wl->default_key = 0;
@@ -4182,7 +4188,7 @@ struct ieee80211_hw *wl1271_alloc_hw(void)
 	wl->aggr_buf = (u8 *)__get_free_pages(GFP_KERNEL, order);
 	if (!wl->aggr_buf) {
 		ret = -ENOMEM;
-		goto err_hw;
+		goto err_wq;
 	}
 
 	wl->dummy_packet = wl12xx_alloc_dummy_packet(wl);
@@ -4227,6 +4233,9 @@ struct ieee80211_hw *wl1271_alloc_hw(void)
 err_aggr:
 	free_pages((unsigned long)wl->aggr_buf, order);
 
+err_wq:
+	destroy_workqueue(wl->freezable_wq);
+
 err_hw:
 	wl1271_debugfs_exit(wl);
 	kfree(plat_dev);
@@ -4257,6 +4266,7 @@ int wl1271_free_hw(struct wl1271 *wl)
 
 	kfree(wl->fw_status);
 	kfree(wl->tx_res_if);
+	destroy_workqueue(wl->freezable_wq);
 
 	ieee80211_free_hw(wl->hw);
 

drivers/net/wireless/wl12xx/rx.c

@@ -150,7 +150,7 @@ static int wl1271_rx_handle_data(struct wl1271 *wl, u8 *data, u32 length)
 	skb_trim(skb, skb->len - desc->pad_len);
 
 	skb_queue_tail(&wl->deferred_rx_queue, skb);
-	ieee80211_queue_work(wl->hw, &wl->netstack_work);
+	queue_work(wl->freezable_wq, &wl->netstack_work);
 
 	return is_data;
 }

drivers/net/wireless/wl12xx/tx.c

@@ -727,7 +727,7 @@ static void wl1271_tx_complete_packet(struct wl1271 *wl,
 
 	/* return the packet to the stack */
 	skb_queue_tail(&wl->deferred_tx_queue, skb);
-	ieee80211_queue_work(wl->hw, &wl->netstack_work);
+	queue_work(wl->freezable_wq, &wl->netstack_work);
 	wl1271_free_tx_id(wl, result->id);
 }
 

drivers/net/wireless/wl12xx/wl12xx.h

@@ -445,6 +445,7 @@ struct wl1271 {
 	struct sk_buff_head deferred_tx_queue;
 
 	struct work_struct tx_work;
+	struct workqueue_struct *freezable_wq;
 
 	/* Pending TX frames */
 	unsigned long tx_frames_map[BITS_TO_LONGS(ACX_TX_DESCRIPTORS)];