x86/irq: Make irq activate operations symmetric

The recent commit which prevents double activation of interrupts unearthed
interesting code in x86. The code (ab)uses irq_domain_activate_irq() to
reconfigure an already activated interrupt. That trips over the prevention
code now.

Fix it by deactivating the interrupt before activating the new configuration.

Fixes: 08d85f3ea99f1 "irqdomain: Avoid activating interrupts more than once"
Reported-and-tested-by: Mike Galbraith <efault@gmx.de>
Reported-and-tested-by: Borislav Petkov <bp@alien8.de>
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Cc: Andrey Ryabinin <aryabinin@virtuozzo.com>
Cc: Marc Zyngier <marc.zyngier@arm.com>
Cc: stable@vger.kernel.org
Link: http://lkml.kernel.org/r/alpine.DEB.2.20.1701311901580.3457@nanos

path: root/include/net/tc_act/tc_bpf.h

/*
 * Copyright (c) 2015 Jiri Pirko <jiri@resnulli.us>
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation; either version 2 of the License, or
 * (at your option) any later version.
 */

#ifndef __NET_TC_BPF_H
#define __NET_TC_BPF_H

#include <linux/filter.h>
#include <net/act_api.h>

struct tcf_bpf {
	struct tc_action	common;
	struct bpf_prog __rcu	*filter;
	union {
		u32		bpf_fd;
		u16		bpf_num_ops;
	};
	struct sock_filter	*bpf_ops;
	const char		*bpf_name;
};
#define to_bpf(a) ((struct tcf_bpf *)a)

#endif /* __NET_TC_BPF_H */