Bluetooth: Introduce new hci_req_add function

This function is analogous to hci_send_cmd() but instead of directly
queuing the command to hdev->cmd_q it adds it to the local queue of the
asynchronous HCI request being build (inside struct hci_request).

This is the main function used for building asynchronous requests and
there should be one or more calls to it between calls to hci_req_init
and hci_req_run.

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>

2 files changed, 23 insertions, 0 deletions

diff --git a/include/net/bluetooth/hci_core.h b/include/net/bluetooth/hci_core.h
index 7191217c6bd1..67fe661259ba 100644
--- a/include/net/bluetooth/hci_core.h
+++ b/include/net/bluetooth/hci_core.h
@@ -1048,6 +1048,7 @@ struct hci_request {
 
 void hci_req_init(struct hci_request *req, struct hci_dev *hdev);
 int hci_req_run(struct hci_request *req, hci_req_complete_t complete);
+int hci_req_add(struct hci_request *req, u16 opcode, u32 plen, void *param);
 
 int hci_send_cmd(struct hci_dev *hdev, __u16 opcode, __u32 plen, void *param);
 void hci_send_acl(struct hci_chan *chan, struct sk_buff *skb, __u16 flags);
diff --git a/net/bluetooth/hci_core.c b/net/bluetooth/hci_core.c
index d2edcc4643c3..6e6a9dd8a155 100644
--- a/net/bluetooth/hci_core.c
+++ b/net/bluetooth/hci_core.c
@@ -2517,6 +2517,28 @@ int hci_send_cmd(struct hci_dev *hdev, __u16 opcode, __u32 plen, void *param)
         return 0;
 }
 
+/* Queue a command to an asynchronous HCI request */
+int hci_req_add(struct hci_request *req, u16 opcode, u32 plen, void *param)
+{
+        struct hci_dev *hdev = req->hdev;
+        struct sk_buff *skb;
+
+        BT_DBG("%s opcode 0x%4.4x plen %d", hdev->name, opcode, plen);
+
+        skb = hci_prepare_cmd(hdev, opcode, plen, param);
+        if (!skb) {
+                BT_ERR("%s no memory for command", hdev->name);
+                return -ENOMEM;
+        }
+
+        if (skb_queue_empty(&req->cmd_q))
+                bt_cb(skb)->req.start = true;
+
+        skb_queue_tail(&req->cmd_q, skb);
+
+        return 0;
+}
+
 /* Get data from the previously sent command */
 void *hci_sent_cmd_data(struct hci_dev *hdev, __u16 opcode)
 {