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, 6 insertions, 0 deletions

diff --git a/include/net/bluetooth/hci_core.h b/include/net/bluetooth/hci_core.h
index 3e70872bffea..7107790817a5 100644
--- a/include/net/bluetooth/hci_core.h
+++ b/include/net/bluetooth/hci_core.h
@@ -126,6 +126,7 @@ struct le_scan_params {
         u8 type;
         u16 interval;
         u16 window;
+        int timeout;
 };
 
 #define NUM_REASSEMBLY 4
@@ -269,6 +270,9 @@ struct hci_dev {
 
         struct delayed_work     le_scan_disable;
 
+        struct work_struct      le_scan;
+        struct le_scan_params   le_scan_params;
+
         int (*open)(struct hci_dev *hdev);
         int (*close)(struct hci_dev *hdev);
         int (*flush)(struct hci_dev *hdev);
@@ -1033,5 +1037,7 @@ void hci_le_ltk_neg_reply(struct hci_conn *conn);
 
 int hci_do_inquiry(struct hci_dev *hdev, u8 length);
 int hci_cancel_inquiry(struct hci_dev *hdev);
+int hci_le_scan(struct hci_dev *hdev, u8 type, u16 interval, u16 window,
+                                                                int timeout);
 
 #endif /* __HCI_CORE_H */