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netpoll: don't require irqs disabled in rt kernels

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write_msg(netconsole.c:836) calls netpoll_send_udp after a call to
spin_lock_irqsave, which normally disables interrupts; but in PREEMPT_RT
this call just locks an rt_mutex without disabling irqs. In this case,
netpoll_send_udp is called with interrupts enabled.

Signed-off-by: Wander Lairson Costa <wander@redhat.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Wander Lairson Costa 2021-05-31 12:23:23 -03:00 committed by David S. Miller
parent a20af95fba
commit b0f6c9ac80
1 changed files with 3 additions and 1 deletions
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4
net/core/netpoll.c
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@ -36,6 +36,7 @@
#include <net/ip6_checksum.h>
#include <asm/unaligned.h>
#include <trace/events/napi.h>
#include <linux/kconfig.h>
/*
* We maintain a small pool of fully-sized skbs, to make sure the
@ -389,7 +390,8 @@ void netpoll_send_udp(struct netpoll *np, const char *msg, int len)
static atomic_t ip_ident;
struct ipv6hdr *ip6h;
WARN_ON_ONCE(!irqs_disabled());
if (!IS_ENABLED(CONFIG_PREEMPT_RT))
WARN_ON_ONCE(!irqs_disabled());
udp_len = len + sizeof(*udph);
if (np->ipv6)