Bluetooth: hci_sync: Fix suspend performance regression

This attempts to fix suspend performance when there is no connections by
not updating the event mask.

Fixes: ef61b6ea ("Bluetooth: Always set event mask on suspend")
Signed-off-by: Luiz Augusto von Dentz <luiz.von.dentz@intel.com>

net/bluetooth/hci_sync.c

@@ -5288,6 +5288,7 @@ int hci_suspend_sync(struct hci_dev *hdev)
 	/* Prevent disconnects from causing scanning to be re-enabled */
 	hci_pause_scan_sync(hdev);
 
+	if (hci_conn_count(hdev)) {
 		/* Soft disconnect everything (power off) */
 		err = hci_disconnect_all_sync(hdev, HCI_ERROR_REMOTE_POWER_OFF);
 		if (err) {
@@ -5297,8 +5298,11 @@ int hci_suspend_sync(struct hci_dev *hdev)
 			return err;
 		}
 
-	/* Update event mask so only the allowed event can wakeup the host */
+		/* Update event mask so only the allowed event can wakeup the
+		 * host.
+		 */
 		hci_set_event_mask_sync(hdev);
+	}
 
 	/* Only configure accept list if disconnect succeeded and wake
 	 * isn't being prevented.