1 files changed, 102 insertions, 0 deletions
diff --git a/net/bluetooth/hci_core.c b/net/bluetooth/hci_core.c
index 7c323bd112f..8b2d543fb14 100644
--- a/net/bluetooth/hci_core.c
+++ b/net/bluetooth/hci_core.c
@@ -79,6 +79,108 @@ static void hci_req_cancel(struct hci_dev *hdev, int err)
 	}
 }
 
+struct sk_buff *hci_get_cmd_complete(struct hci_dev *hdev, u16 opcode)
+{
+	struct hci_ev_cmd_complete *ev;
+	struct hci_event_hdr *hdr;
+	struct sk_buff *skb;
+
+	hci_dev_lock(hdev);
+
+	skb = hdev->recv_evt;
+	hdev->recv_evt = NULL;
+
+	hci_dev_unlock(hdev);
+
+	if (!skb)
+		return ERR_PTR(-ENODATA);
+
+	if (skb->len < sizeof(*hdr)) {
+		BT_ERR("Too short HCI event");
+		goto failed;
+	}
+
+	hdr = (void *) skb->data;
+	skb_pull(skb, HCI_EVENT_HDR_SIZE);
+
+	if (hdr->evt != HCI_EV_CMD_COMPLETE) {
+		BT_DBG("Last event is not cmd complete (0x%2.2x)", hdr->evt);
+		goto failed;
+	}
+
+	if (skb->len < sizeof(*ev)) {
+		BT_ERR("Too short cmd_complete event");
+		goto failed;
+	}
+
+	ev = (void *) skb->data;
+	skb_pull(skb, sizeof(*ev));
+
+	if (opcode == __le16_to_cpu(ev->opcode))
+		return skb;
+
+	BT_DBG("opcode doesn't match (0x%2.2x != 0x%2.2x)", opcode,
+	       __le16_to_cpu(ev->opcode));
+
+failed:
+	kfree_skb(skb);
+	return ERR_PTR(-ENODATA);
+}
+
+struct sk_buff *__hci_cmd_sync(struct hci_dev *hdev, u16 opcode, u32 plen,
+			       void *param, u32 timeout)
+{
+	DECLARE_WAITQUEUE(wait, current);
+	struct hci_request req;
+	int err = 0;
+
+	BT_DBG("%s", hdev->name);
+
+	hci_req_init(&req, hdev);
+
+	hci_req_add(&req, opcode, plen, param);
+
+	hdev->req_status = HCI_REQ_PEND;
+
+	err = hci_req_run(&req, hci_req_sync_complete);
+	if (err < 0)
+		return ERR_PTR(err);
+
+	add_wait_queue(&hdev->req_wait_q, &wait);
+	set_current_state(TASK_INTERRUPTIBLE);
+
+	schedule_timeout(timeout);
+
+	remove_wait_queue(&hdev->req_wait_q, &wait);
+
+	if (signal_pending(current))
+		return ERR_PTR(-EINTR);
+
+	switch (hdev->req_status) {
+	case HCI_REQ_DONE:
+		err = -bt_to_errno(hdev->req_result);
+		break;
+
+	case HCI_REQ_CANCELED:
+		err = -hdev->req_result;
+		break;
+
+	default:
+		err = -ETIMEDOUT;
+		break;
+	}
+
+	hdev->req_status = hdev->req_result = 0;
+
+	BT_DBG("%s end: err %d", hdev->name, err);
+
+	if (err < 0)
+		return ERR_PTR(err);
+
+	return hci_get_cmd_complete(hdev, opcode);
+}
+EXPORT_SYMBOL(__hci_cmd_sync);
+
 /* Execute request and wait for completion. */
 static int __hci_req_sync(struct hci_dev *hdev,
 			  void (*func)(struct hci_request *req,