Bluetooth: hci_core: Fix tracking of periodic advertisement

Periodic advertising enabled flag cannot be tracked by the enabled
flag since advertising and periodic advertising each can be
enabled/disabled separately from one another causing the states to be
inconsistent when for example an advertising set is disabled its
enabled flag is set to false which is then used for periodic which has
not being disabled.

Fixes: eca0ae4aea66 ("Bluetooth: Add initial implementation of BIS connections")
Signed-off-by: Luiz Augusto von Dentz <[e-mail]>

include/net/bluetooth/hci_core.h

···
 	bool	enabled;
 	bool	pending;
 	bool	periodic;
+	bool	periodic_enabled;
 	__u8	mesh;
 	__u8	instance;
 	__u8	handle;

net/bluetooth/hci_event.c

···
 
 		hci_dev_set_flag(hdev, HCI_LE_ADV);
 
-		if (adv && !adv->periodic)
+		if (adv)
 			adv->enabled = true;
 		else if (!set->handle)
 			hci_dev_set_flag(hdev, HCI_LE_ADV_0);
···
 		hci_dev_set_flag(hdev, HCI_LE_PER_ADV);
 
 		if (adv)
-			adv->enabled = true;
+			adv->periodic_enabled = true;
 	} else {
+		if (adv)
+			adv->periodic_enabled = false;
+
 		/* If just one instance was disabled check if there are
 		 * any other instance enabled before clearing HCI_LE_PER_ADV.
 		 * The current periodic adv instance will be marked as

net/bluetooth/hci_sync.c

···
 
 	/* If periodic advertising already disabled there is nothing to do. */
 	adv = hci_find_adv_instance(hdev, instance);
-	if (!adv || !adv->periodic || !adv->enabled)
+	if (!adv || !adv->periodic_enabled)
 		return 0;
 
 	memset(&cp, 0, sizeof(cp));
···
 
 	/* If periodic advertising already enabled there is nothing to do. */
 	adv = hci_find_adv_instance(hdev, instance);
-	if (adv && adv->periodic && adv->enabled)
+	if (adv && adv->periodic_enabled)
 		return 0;
 
 	memset(&cp, 0, sizeof(cp));