From: Nikolay Aleksandrov <nikolay@cumulusnetworks.com>
Date: Fri, 28 Aug 2015 22:44:25 +0000 (-0700)
Subject: netpoll: warn on netpoll_send_udp users who haven't disabled irqs
X-Git-Tag: firefly_0821_release~176^2~1159^2~43
X-Git-Url: http://demsky.eecs.uci.edu/git/?a=commitdiff_plain;h=c9fd56b34efd06a031cbc918d288f09e38173ff9;p=firefly-linux-kernel-4.4.55.git

netpoll: warn on netpoll_send_udp users who haven't disabled irqs

Make sure we catch future netpoll_send_udp users who use it without
disabling irqs and also as a hint for poll_controller users.

Signed-off-by: Nikolay Aleksandrov <nikolay@cumulusnetworks.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
---

diff --git a/net/core/netpoll.c b/net/core/netpoll.c
index c126a878c47c..6aa3db8dfc3b 100644
--- a/net/core/netpoll.c
+++ b/net/core/netpoll.c
@@ -380,6 +380,8 @@ 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());
+
 	udp_len = len + sizeof(*udph);
 	if (np->ipv6)
 		ip_len = udp_len + sizeof(*ip6h);