Bluetooth: mgmt: multi adv for remove_advertising*()

The remove_advertising() and remove_advertising_complete() functions
had instance identifiers hard coded. Notably, when passing in 0x00 as
an instance identifier to signal that all instances should be removed
then the mgmt API would return a hard coded 0x01 rather than returning
the expected value 0x00. This bug is being fixed by always referencing
the instance identifier from the management API call instead.

remove_advertising() is refactored to use the new dynamic advertising
instance list. The logic is being changed to make multi-instance
advertising actually work, notably the schedule_adv_instance() method is
being referenced to make sure that other instances will continue to
advertise even if one instance is being removed.

The code is made more readable by factoring advertising instance
management and initialization into the low-level
hci_remove_adv_instance() and hci_adv_instances_clear() functions.

The method now references the clear_adv_instance() helper method to
remove duplicate logic and code.

Signed-off-by: Florian Grandel <fgrandel@gmail.com>
Signed-off-by: Marcel Holtmann <marcel@holtmann.org>

net/bluetooth/mgmt.c

@@ -7248,6 +7248,7 @@ static void remove_advertising_complete(struct hci_dev *hdev, u8 status,
 					u16 opcode)
 {
 	struct mgmt_pending_cmd *cmd;
+	struct mgmt_cp_remove_advertising *cp;
 	struct mgmt_rp_remove_advertising rp;
 
 	BT_DBG("status %d", status);
@@ -7262,7 +7263,8 @@ static void remove_advertising_complete(struct hci_dev *hdev, u8 status,
 	if (!cmd)
 		goto unlock;
 
-	rp.instance = 1;
+	cp = cmd->param;
+	rp.instance = cp->instance;
 
 	mgmt_cmd_complete(cmd->sk, cmd->index, cmd->opcode, MGMT_STATUS_SUCCESS,
 			  &rp, sizeof(rp));
@@ -7277,21 +7279,25 @@ static int remove_advertising(struct sock *sk, struct hci_dev *hdev,
 {
 	struct mgmt_cp_remove_advertising *cp = data;
 	struct mgmt_rp_remove_advertising rp;
+	struct adv_info *adv_instance;
 	int err;
 	struct mgmt_pending_cmd *cmd;
 	struct hci_request req;
 
 	BT_DBG("%s", hdev->name);
 
-	/* The current implementation only allows modifying instance no 1. A
-	 * value of 0 indicates that all instances should be cleared.
-	 */
-	if (cp->instance > 1)
-		return mgmt_cmd_status(sk, hdev->id, MGMT_OP_REMOVE_ADVERTISING,
-				       MGMT_STATUS_INVALID_PARAMS);
-
 	hci_dev_lock(hdev);
 
+	if (cp->instance)
+		adv_instance = hci_find_adv_instance(hdev, cp->instance);
+
+	if (!(cp->instance == 0x00 || adv_instance)) {
+		err = mgmt_cmd_status(sk, hdev->id,
+				      MGMT_OP_REMOVE_ADVERTISING,
+				      MGMT_STATUS_INVALID_PARAMS);
+		goto unlock;
+	}
+
 	if (pending_find(MGMT_OP_ADD_ADVERTISING, hdev) ||
 	    pending_find(MGMT_OP_REMOVE_ADVERTISING, hdev) ||
 	    pending_find(MGMT_OP_SET_LE, hdev)) {
@@ -7306,21 +7312,21 @@ static int remove_advertising(struct sock *sk, struct hci_dev *hdev,
 		goto unlock;
 	}
 
-	if (hdev->adv_instance_timeout)
-		cancel_delayed_work(&hdev->adv_instance_expire);
-
-	memset(&hdev->adv_instance, 0, sizeof(hdev->adv_instance));
+	hci_req_init(&req, hdev);
 
-	advertising_removed(sk, hdev, 1);
+	clear_adv_instance(hdev, &req, cp->instance, true);
 
-	hci_dev_clear_flag(hdev, HCI_ADVERTISING_INSTANCE);
+	if (list_empty(&hdev->adv_instances))
+		disable_advertising(&req);
 
-	/* If the HCI_ADVERTISING flag is set or the device isn't powered then
-	 * we have no HCI communication to make. Simply return.
+	/* If no HCI commands have been collected so far or the HCI_ADVERTISING
+	 * flag is set or the device isn't powered then we have no HCI
+	 * communication to make. Simply return.
 	 */
-	if (!hdev_is_powered(hdev) ||
+	if (skb_queue_empty(&req.cmd_q) ||
+	    !hdev_is_powered(hdev) ||
 	    hci_dev_test_flag(hdev, HCI_ADVERTISING)) {
-		rp.instance = 1;
+		rp.instance = cp->instance;
 		err = mgmt_cmd_complete(sk, hdev->id,
 					MGMT_OP_REMOVE_ADVERTISING,
 					MGMT_STATUS_SUCCESS, &rp, sizeof(rp));
@@ -7334,9 +7340,6 @@ static int remove_advertising(struct sock *sk, struct hci_dev *hdev,
 		goto unlock;
 	}
 
-	hci_req_init(&req, hdev);
-	disable_advertising(&req);
-
 	err = hci_req_run(&req, remove_advertising_complete);
 	if (err < 0)
 		mgmt_pending_remove(cmd);