232 	struct snd_usb_substream *data_subs;  in call_retire_callback()  local
234 	data_subs = READ_ONCE(ep->data_subs);  in call_retire_callback()
235 	if (data_subs && ep->retire_data_urb)  in call_retire_callback()
236 		ep->retire_data_urb(data_subs, urb);  in call_retire_callback()
319 	struct snd_usb_substream *data_subs;  in prepare_outbound_urb()  local
325 		data_subs = READ_ONCE(ep->data_subs);  in prepare_outbound_urb()
326 		if (data_subs && ep->prepare_data_urb)  in prepare_outbound_urb()
327 			return ep->prepare_data_urb(data_subs, urb, in_stream_lock);  in prepare_outbound_urb()
396 	struct snd_usb_substream *data_subs;  in notify_xrun()  local
398 	data_subs = READ_ONCE(ep->data_subs);  in notify_xrun()
399 	if (data_subs && data_subs->pcm_substream)  in notify_xrun()
400 		snd_pcm_stop_xrun(data_subs->pcm_substream);  in notify_xrun()
855 				   struct snd_usb_substream *data_subs)  in snd_usb_endpoint_set_callback()  argument
859 	if (data_subs)  in snd_usb_endpoint_set_callback()
860 		ep->lowlatency_playback = data_subs->lowlatency_playback;  in snd_usb_endpoint_set_callback()
863 	WRITE_ONCE(ep->data_subs, data_subs);  in snd_usb_endpoint_set_callback()