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/netfilter/ipv6/nf_reject.h

#ifndef _IPV6_NF_REJECT_H
#define _IPV6_NF_REJECT_H

#include <linux/icmpv6.h>

void nf_send_unreach6(struct net *net, struct sk_buff *skb_in, unsigned char code,
		      unsigned int hooknum);

void nf_send_reset6(struct net *net, struct sk_buff *oldskb, int hook);

const struct tcphdr *nf_reject_ip6_tcphdr_get(struct sk_buff *oldskb,
					      struct tcphdr *otcph,
					      unsigned int *otcplen, int hook);
struct ipv6hdr *nf_reject_ip6hdr_put(struct sk_buff *nskb,
				     const struct sk_buff *oldskb,
				     __u8 protocol, int hoplimit);
void nf_reject_ip6_tcphdr_put(struct sk_buff *nskb,
			      const struct sk_buff *oldskb,
			      const struct tcphdr *oth, unsigned int otcplen);

#endif /* _IPV6_NF_REJECT_H */