Bluetooth: Use delayed work for advertisiment cache timeout

As HCI rx path is now done in process context it makes sense to do all the
timer in process context as well.

Acked-by: Marcel Holtmann <marcel@holtmann.org>
Signed-off-by: Gustavo F. Padovan <padovan@profusion.mobi>

include/net/bluetooth/hci_core.h

@@ -226,7 +226,7 @@ struct hci_dev {
 	struct list_head	remote_oob_data;
 
 	struct list_head	adv_entries;
-	struct timer_list	adv_timer;
+	struct delayed_work	adv_work;
 
 	struct hci_dev_stats	stat;
 

net/bluetooth/hci_core.c

@@ -1340,9 +1340,10 @@ int hci_blacklist_del(struct hci_dev *hdev, bdaddr_t *bdaddr)
 	return mgmt_device_unblocked(hdev, bdaddr);
 }
 
-static void hci_clear_adv_cache(unsigned long arg)
+static void hci_clear_adv_cache(struct work_struct *work)
 {
-	struct hci_dev *hdev = (void *) arg;
+	struct hci_dev *hdev = container_of(work, struct hci_dev,
+							adv_work.work);
 
 	hci_dev_lock(hdev);
 
@@ -1488,9 +1489,8 @@ int hci_register_dev(struct hci_dev *hdev)
 	INIT_LIST_HEAD(&hdev->remote_oob_data);
 
 	INIT_LIST_HEAD(&hdev->adv_entries);
-	setup_timer(&hdev->adv_timer, hci_clear_adv_cache,
-						(unsigned long) hdev);
 
+	INIT_DELAYED_WORK(&hdev->adv_work, hci_clear_adv_cache);
 	INIT_WORK(&hdev->power_on, hci_power_on);
 	INIT_DELAYED_WORK(&hdev->power_off, hci_power_off);
 
@@ -1576,7 +1576,7 @@ void hci_unregister_dev(struct hci_dev *hdev)
 
 	hci_del_sysfs(hdev);
 
-	del_timer(&hdev->adv_timer);
+	cancel_delayed_work_sync(&hdev->adv_work);
 
 	destroy_workqueue(hdev->workqueue);
 

net/bluetooth/hci_event.c

@@ -1017,7 +1017,7 @@ static void hci_cc_le_set_scan_enable(struct hci_dev *hdev,
 	if (cp->enable == 0x01) {
 		set_bit(HCI_LE_SCAN, &hdev->dev_flags);
 
-		del_timer(&hdev->adv_timer);
+		cancel_delayed_work_sync(&hdev->adv_work);
 
 		hci_dev_lock(hdev);
 		hci_adv_entries_clear(hdev);
@@ -1025,7 +1025,9 @@ static void hci_cc_le_set_scan_enable(struct hci_dev *hdev,
 	} else if (cp->enable == 0x00) {
 		clear_bit(HCI_LE_SCAN, &hdev->dev_flags);
 
-		mod_timer(&hdev->adv_timer, jiffies + ADV_CLEAR_TIMEOUT);
+		cancel_delayed_work_sync(&hdev->adv_work);
+		queue_delayed_work(hdev->workqueue, &hdev->adv_work,
+						 jiffies + ADV_CLEAR_TIMEOUT);
 	}
 }