kernel/irq/manage.c

1197 	ret = action->thread_fn(action->irq, action->dev_id);
1218 	ret = action->thread_fn(action->irq, action->dev_id);
1388 	if (new->handler && new->thread_fn) {
1394 		new->secondary->thread_fn = new->thread_fn;
1401 	new->thread_fn = new->handler;
1535 		if (!new->thread_fn) {
1558 	if (new->thread_fn && !nested) {
2110  *		  If handler is NULL and thread_fn != NULL
2112  *	@thread_fn: Function called from the irq handler thread
2126  *	then you need to supply @handler and @thread_fn. @handler is
2131  *	@thread_fn. This split handler design is necessary to support
2145  *	IRQF_ONESHOT		Run thread_fn with interrupt line masked
2148 			 irq_handler_t thread_fn, unsigned long irqflags,
2186 		if (!thread_fn)
2196 	action->thread_fn = thread_fn;