Bluetooth: Fix updating page scan parameters when not necessary

Now that the current page scan parameters are stored in struct hci_dev
we should check against those values before sending new HCI commands to
change them.

Signed-off-by: Johan Hedberg <johan.hedberg@intel.com>
Acked-by: Marcel Holtmann <marcel@holtmann.org>
Signed-off-by: Gustavo Padovan <gustavo.padovan@collabora.co.uk>

diff --git a/net/bluetooth/mgmt.c b/net/bluetooth/mgmt.c
index 98f6295..7783b8d 100644 (file)
--- a/net/bluetooth/mgmt.c
+++ b/net/bluetooth/mgmt.c
@@ -1002,6 +1002,7 @@ failed:
 
 static void write_fast_connectable(struct hci_request *req, bool enable)
 {
+       struct hci_dev *hdev = req->hdev;
        struct hci_cp_write_page_scan_activity acp;
        u8 type;
 
@@ -1019,8 +1020,13 @@ static void write_fast_connectable(struct hci_request *req, bool enable)
 
        acp.window = __constant_cpu_to_le16(0x0012);
 
-       hci_req_add(req, HCI_OP_WRITE_PAGE_SCAN_ACTIVITY, sizeof(acp), &acp);
-       hci_req_add(req, HCI_OP_WRITE_PAGE_SCAN_TYPE, 1, &type);
+       if (__cpu_to_le16(hdev->page_scan_interval) != acp.interval ||
+           __cpu_to_le16(hdev->page_scan_window) != acp.window)
+               hci_req_add(req, HCI_OP_WRITE_PAGE_SCAN_ACTIVITY,
+                           sizeof(acp), &acp);
+
+       if (hdev->page_scan_type != type)
+               hci_req_add(req, HCI_OP_WRITE_PAGE_SCAN_TYPE, 1, &type);
 }
 
 static void set_connectable_complete(struct hci_dev *hdev, u8 status)