Bluetooth: Add hci_le_scan()

We are not supposed to block in start_discovery() because
start_discovery code is running in write() syscall context
and this would block the write operation on the mgmt socket.
This way, we cannot directly call hci_do_le_scan() to scan
LE devices in start_discovery(). To overcome this issue a
derefered work (hdev->le_scan) was created so we can properly
call hci_do_le_scan().

The helper function hci_le_scan() simply set LE scan parameters
and queue hdev->le_scan work. The work is queued on system_long_wq
since it can sleep for a few seconds in the worst case (timeout).

Signed-off-by: Andre Guedes <andre.guedes@openbossa.org>
Acked-by: Marcel Holtmann <marcel@holtmann.org>
Signed-off-by: Johan Hedberg <johan.hedberg@intel.com>

1 files changed, 35 insertions, 0 deletions

diff --git a/net/bluetooth/hci_core.c b/net/bluetooth/hci_core.c
index ae86cdd80ac0..3d09f4b4ca68 100644
--- a/net/bluetooth/hci_core.c
+++ b/net/bluetooth/hci_core.c
@@ -735,6 +735,8 @@ static int hci_dev_do_close(struct hci_dev *hdev)
 {
 	BT_DBG("%s %p", hdev->name, hdev);
 
+	cancel_work_sync(&hdev->le_scan);
+
 	hci_req_cancel(hdev, ENODEV);
 	hci_req_lock(hdev);
 
@@ -1668,6 +1670,37 @@ static void le_scan_disable_work(struct work_struct *work)
 	hci_send_cmd(hdev, HCI_OP_LE_SET_SCAN_ENABLE, sizeof(cp), &cp);
 }
 
+static void le_scan_work(struct work_struct *work)
+{
+	struct hci_dev *hdev = container_of(work, struct hci_dev, le_scan);
+	struct le_scan_params *param = &hdev->le_scan_params;
+
+	BT_DBG("%s", hdev->name);
+
+	hci_do_le_scan(hdev, param->type, param->interval,
+					param->window, param->timeout);
+}
+
+int hci_le_scan(struct hci_dev *hdev, u8 type, u16 interval, u16 window,
+								int timeout)
+{
+	struct le_scan_params *param = &hdev->le_scan_params;
+
+	BT_DBG("%s", hdev->name);
+
+	if (work_busy(&hdev->le_scan))
+		return -EINPROGRESS;
+
+	param->type = type;
+	param->interval = interval;
+	param->window = window;
+	param->timeout = timeout;
+
+	queue_work(system_long_wq, &hdev->le_scan);
+
+	return 0;
+}
+
 /* Register HCI device */
 int hci_register_dev(struct hci_dev *hdev)
 {
@@ -1754,6 +1787,8 @@ int hci_register_dev(struct hci_dev *hdev)
 
 	atomic_set(&hdev->promisc, 0);
 
+	INIT_WORK(&hdev->le_scan, le_scan_work);
+
 	INIT_DELAYED_WORK(&hdev->le_scan_disable, le_scan_disable_work);
 
 	write_unlock(&hci_dev_list_lock);