Bluetooth: AMP: Handle Accept phylink command status evt

When receiving HCI Command Status event for Accept Physical Link
execute HCI Write Remote AMP Assoc with data saved from A2MP Create
Physical Link Request.
Signed-off-by: Andrei Emeltchenko <andrei.emeltchenko@intel.com>
Signed-off-by: Gustavo Padovan <gustavo.padovan@collabora.co.uk>

include/net/bluetooth/amp.h

@@ -25,6 +25,7 @@ struct amp_ctrl {
 };
 
 int amp_ctrl_put(struct amp_ctrl *ctrl);
+void amp_ctrl_get(struct amp_ctrl *ctrl);
 struct amp_ctrl *amp_ctrl_add(struct amp_mgr *mgr);
 struct amp_ctrl *amp_ctrl_lookup(struct amp_mgr *mgr, u8 id);
 void amp_ctrl_list_flush(struct amp_mgr *mgr);

net/bluetooth/a2mp.c

@@ -438,6 +438,7 @@ static int a2mp_createphyslink_req(struct amp_mgr *mgr, struct sk_buff *skb,
 	struct a2mp_physlink_rsp rsp;
 	struct hci_dev *hdev;
 	struct hci_conn *hcon;
+	struct amp_ctrl *ctrl;
 
 	if (le16_to_cpu(hdr->len) < sizeof(*req))
 		return -EINVAL;
@@ -453,6 +454,37 @@ static int a2mp_createphyslink_req(struct amp_mgr *mgr, struct sk_buff *skb,
 		goto send_rsp;
 	}
 
+	ctrl = amp_ctrl_lookup(mgr, rsp.remote_id);
+	if (!ctrl) {
+		ctrl = amp_ctrl_add(mgr);
+		if (ctrl) {
+			amp_ctrl_get(ctrl);
+		} else {
+			rsp.status = A2MP_STATUS_UNABLE_START_LINK_CREATION;
+			goto send_rsp;
+		}
+	}
+
+	if (ctrl) {
+		u8 *assoc, assoc_len = le16_to_cpu(hdr->len) - sizeof(*req);
+
+		ctrl->id = rsp.remote_id;
+
+		assoc = kzalloc(assoc_len, GFP_KERNEL);
+		if (!assoc) {
+			amp_ctrl_put(ctrl);
+			return -ENOMEM;
+		}
+
+		memcpy(assoc, req->amp_assoc, assoc_len);
+		ctrl->assoc = assoc;
+		ctrl->assoc_len = assoc_len;
+		ctrl->assoc_rem_len = assoc_len;
+		ctrl->assoc_len_so_far = 0;
+
+		amp_ctrl_put(ctrl);
+	}
+
 	hcon = phylink_add(hdev, mgr, req->local_id);
 	if (hcon) {
 		amp_accept_phylink(hdev, mgr, hcon);

net/bluetooth/amp.c

@@ -19,7 +19,7 @@
 #include <crypto/hash.h>
 
 /* Remote AMP Controllers interface */
-static void amp_ctrl_get(struct amp_ctrl *ctrl)
+void amp_ctrl_get(struct amp_ctrl *ctrl)
 {
 	BT_DBG("ctrl %p orig refcnt %d", ctrl,
 	       atomic_read(&ctrl->kref.refcount));

net/bluetooth/hci_event.c

@@ -1729,6 +1729,22 @@ static void hci_cs_create_phylink(struct hci_dev *hdev, u8 status)
 	amp_write_remote_assoc(hdev, cp->phy_handle);
 }
 
+static void hci_cs_accept_phylink(struct hci_dev *hdev, u8 status)
+{
+	struct hci_cp_accept_phy_link *cp;
+
+	BT_DBG("%s status 0x%2.2x", hdev->name, status);
+
+	if (status)
+		return;
+
+	cp = hci_sent_cmd_data(hdev, HCI_OP_ACCEPT_PHY_LINK);
+	if (!cp)
+		return;
+
+	amp_write_remote_assoc(hdev, cp->phy_handle);
+}
+
 static void hci_inquiry_complete_evt(struct hci_dev *hdev, struct sk_buff *skb)
 {
 	__u8 status = *((__u8 *) skb->data);
@@ -2551,6 +2567,10 @@ static void hci_cmd_status_evt(struct hci_dev *hdev, struct sk_buff *skb)
 		hci_cs_create_phylink(hdev, ev->status);
 		break;
 
+	case HCI_OP_ACCEPT_PHY_LINK:
+		hci_cs_accept_phylink(hdev, ev->status);
+		break;
+
 	default:
 		BT_DBG("%s opcode 0x%4.4x", hdev->name, opcode);
 		break;