Bluetooth: Use HCI request in interleaved discovery

In order to have a better HCI error handling in interleaved discovery
functionality, we should use the HCI request framework.

This patch updates le_scan_disable_work function so it uses the
HCI request framework instead of the hci_send_cmd helper. A complete
callback is registered (le_scan_disable_work_complete function) so we
are able to trigger the inquiry procedure (if we are running the
interleaved discovery) or to stop the discovery procedure (if we are
running LE-only discovery).

This patch also removes the extra logic in hci_cc_le_set_scan_enable
to trigger the inquiry procedure and the mgmt_interleaved_discovery
function since they become useless.

Signed-off-by: Andre Guedes <andre.guedes@openbossa.org>
Signed-off-by: Gustavo Padovan <gustavo.padovan@collabora.co.uk>

3 files changed, 64 insertions, 28 deletions

diff --git a/net/bluetooth/hci_core.c b/net/bluetooth/hci_core.c
index 43c63877c5b7..9270d7ee489d 100644
--- a/net/bluetooth/hci_core.c
+++ b/net/bluetooth/hci_core.c
@@ -2067,17 +2067,80 @@ int hci_cancel_le_scan(struct hci_dev *hdev)
         return 0;
 }
 
+static void inquiry_complete(struct hci_dev *hdev, u8 status)
+{
+        if (status) {
+                BT_ERR("Failed to start inquiry: status %d", status);
+
+                hci_dev_lock(hdev);
+                hci_discovery_set_state(hdev, DISCOVERY_STOPPED);
+                hci_dev_unlock(hdev);
+                return;
+        }
+}
+
+static void le_scan_disable_work_complete(struct hci_dev *hdev, u8 status)
+{
+        /* General inquiry access code (GIAC) */
+        u8 lap[3] = { 0x33, 0x8b, 0x9e };
+        struct hci_request req;
+        struct hci_cp_inquiry cp;
+        int err;
+
+        if (status) {
+                BT_ERR("Failed to disable LE scanning: status %d", status);
+                return;
+        }
+
+        switch (hdev->discovery.type) {
+        case DISCOV_TYPE_LE:
+                hci_dev_lock(hdev);
+                hci_discovery_set_state(hdev, DISCOVERY_STOPPED);
+                hci_dev_unlock(hdev);
+                break;
+
+        case DISCOV_TYPE_INTERLEAVED:
+                hci_req_init(&req, hdev);
+
+                memset(&cp, 0, sizeof(cp));
+                memcpy(&cp.lap, lap, sizeof(cp.lap));
+                cp.length = DISCOV_INTERLEAVED_INQUIRY_LEN;
+                hci_req_add(&req, HCI_OP_INQUIRY, sizeof(cp), &cp);
+
+                hci_dev_lock(hdev);
+
+                hci_inquiry_cache_flush(hdev);
+
+                err = hci_req_run(&req, inquiry_complete);
+                if (err) {
+                        BT_ERR("Inquiry request failed: err %d", err);
+                        hci_discovery_set_state(hdev, DISCOVERY_STOPPED);
+                }
+
+                hci_dev_unlock(hdev);
+                break;
+        }
+}
+
 static void le_scan_disable_work(struct work_struct *work)
 {
         struct hci_dev *hdev = container_of(work, struct hci_dev,
                                             le_scan_disable.work);
         struct hci_cp_le_set_scan_enable cp;
+        struct hci_request req;
+        int err;
 
         BT_DBG("%s", hdev->name);
 
+        hci_req_init(&req, hdev);
+
         memset(&cp, 0, sizeof(cp));
+        cp.enable = LE_SCAN_DISABLE;
+        hci_req_add(&req, HCI_OP_LE_SET_SCAN_ENABLE, sizeof(cp), &cp);
 
-        hci_send_cmd(hdev, HCI_OP_LE_SET_SCAN_ENABLE, sizeof(cp), &cp);
+        err = hci_req_run(&req, le_scan_disable_work_complete);
+        if (err)
+                BT_ERR("Disable LE scanning request failed: err %d", err);
 }
 
 static void le_scan_work(struct work_struct *work)
diff --git a/net/bluetooth/hci_event.c b/net/bluetooth/hci_event.c
index 0e71e6c47391..faaf1f31345d 100644
--- a/net/bluetooth/hci_event.c
+++ b/net/bluetooth/hci_event.c
@@ -974,16 +974,6 @@ static void hci_cc_le_set_scan_enable(struct hci_dev *hdev,
                 }
 
                 clear_bit(HCI_LE_SCAN, &hdev->dev_flags);
-
-                if (hdev->discovery.type == DISCOV_TYPE_INTERLEAVED &&
-                    hdev->discovery.state == DISCOVERY_FINDING) {
-                        mgmt_interleaved_discovery(hdev);
-                } else {
-                        hci_dev_lock(hdev);
-                        hci_discovery_set_state(hdev, DISCOVERY_STOPPED);
-                        hci_dev_unlock(hdev);
-                }
-
                 break;
 
         default:
diff --git a/net/bluetooth/mgmt.c b/net/bluetooth/mgmt.c
index 6b31e93af761..743100f3ab9c 100644
--- a/net/bluetooth/mgmt.c
+++ b/net/bluetooth/mgmt.c
@@ -2621,23 +2621,6 @@ static int remove_remote_oob_data(struct sock *sk, struct hci_dev *hdev,
         return err;
 }
 
-int mgmt_interleaved_discovery(struct hci_dev *hdev)
-{
-        int err;
-
-        BT_DBG("%s", hdev->name);
-
-        hci_dev_lock(hdev);
-
-        err = hci_do_inquiry(hdev, DISCOV_INTERLEAVED_INQUIRY_LEN);
-        if (err < 0)
-                hci_discovery_set_state(hdev, DISCOVERY_STOPPED);
-
-        hci_dev_unlock(hdev);
-
-        return err;
-}
-
 static int mgmt_start_discovery_failed(struct hci_dev *hdev, u8 status)
 {
         struct pending_cmd *cmd;