// SPDX-License-Identifier: GPL-2.0
/*
* Copyright (C) 1992, 1998-2006 Linus Torvalds, Ingo Molnar
* Copyright (C) 2005-2006, Thomas Gleixner, Russell King
*
* This file contains the core interrupt handling code, for irq-chip based
* architectures. Detailed information is available in
* Documentation/core-api/genericirq.rst
*/
#include <linux/irq.h>
#include <linux/msi.h>
#include <linux/module.h>
#include <linux/interrupt.h>
#include <linux/kernel_stat.h>
#include <linux/irqdomain.h>
#include <trace/events/irq.h>
#include "internals.h"
static irqreturn_t bad_chained_irq(int irq, void *dev_id)
{
WARN_ONCE(1, "Chained irq %d should not call an action\n", irq);
return IRQ_NONE;
}
/*
* Chained handlers should never call action on their IRQ. This default
* action will emit warning if such thing happens.
*/
struct irqaction chained_action = {
.handler = bad_chained_irq,
};
/**
* irq_set_chip - set the irq chip for an irq
* @irq: irq number
* @chip: pointer to irq chip description structure
*/
int irq_set_chip(unsigned int irq, struct irq_chip *chip)
{
unsigned long flags;
struct irq_desc *desc = irq_get_desc_lock(irq, &flags, 0);
if (!desc)
return -EINVAL;
if (!chip)
chip = &no_irq_chip;
desc->irq_data.chip = chip;
irq_put_desc_unlock(desc, flags);
/*
* For !CONFIG_SPARSE_IRQ make the irq show up in
* allocated_irqs.
*/
irq_mark_irq(irq);
return 0;
}
EXPORT_SYMBOL(irq_set_chip);
/**
* irq_set_type - set the irq trigger type for an irq
* @irq: irq 