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 c126a878c47c95587cd4713ee500ec0e9577af39..6aa3db8dfc3b5512577b60f9bf85439c726f85b8 100644 (file)
--- 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);