The function is not used anywhere in the codebase.
---
 drivers/qmimodem/qmi.c | 41 -----------------------------------------
 drivers/qmimodem/qmi.h |  1 -
 2 files changed, 42 deletions(-)

diff --git a/drivers/qmimodem/qmi.c b/drivers/qmimodem/qmi.c
index 2e920abd..6cc858be 100644
--- a/drivers/qmimodem/qmi.c
+++ b/drivers/qmimodem/qmi.c
@@ -2284,47 +2284,6 @@ uint16_t qmi_service_send(struct qmi_service *service,
 	return 1;
 }
 
-bool qmi_service_cancel(struct qmi_service *service, uint16_t id)
-{
-	unsigned int tid = id;
-	struct qmi_device *device;
-	struct qmi_request *req;
-	GList *list;
-
-	if (!service || !tid)
-		return false;
-
-	if (!service->client_id)
-		return false;
-
-	device = service->device;
-	if (!device)
-		return false;
-
-	list = g_queue_find_custom(device->req_queue,
-				GUINT_TO_POINTER(tid), __request_compare);
-	if (list) {
-		req = list->data;
-
-		g_queue_delete_link(device->req_queue, list);
-	} else {
-		list = g_queue_find_custom(device->service_queue,
-				GUINT_TO_POINTER(tid), __request_compare);
-		if (!list)
-			return false;
-
-		req = list->data;
-
-		g_queue_delete_link(device->service_queue, list);
-	}
-
-	service_send_free(req->user_data);
-
-	__request_free(req, NULL);
-
-	return true;
-}
-
 static GQueue *remove_client(GQueue *queue, uint8_t client)
 {
 	GQueue *new_queue;
diff --git a/drivers/qmimodem/qmi.h b/drivers/qmimodem/qmi.h
index e1801045..bb8eb4a0 100644
--- a/drivers/qmimodem/qmi.h
+++ b/drivers/qmimodem/qmi.h
@@ -170,7 +170,6 @@ uint16_t qmi_service_send(struct qmi_service *service,
 				uint16_t message, struct qmi_param *param,
 				qmi_result_func_t func,
 				void *user_data, qmi_destroy_func_t destroy);
-bool qmi_service_cancel(struct qmi_service *service, uint16_t id);
 bool qmi_service_cancel_all(struct qmi_service *service);
 
 uint16_t qmi_service_register(struct qmi_service *service,
-- 
2.15.1