netdev - [PATCH v3 net-next 5/7] sctp: prepare for socket backlog behavior change

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Message-Id: <1461964613-4872-6-git-send-email-edumazet@google.com>
Date:	Fri, 29 Apr 2016 14:16:51 -0700
From:	Eric Dumazet <edumazet@...gle.com>
To:	"David S . Miller" <davem@...emloft.net>
Cc:	netdev <netdev@...r.kernel.org>,
	Eric Dumazet <edumazet@...gle.com>,
	Soheil Hassas Yeganeh <soheil@...gle.com>,
	Alexei Starovoitov <ast@...com>,
	Marcelo Ricardo Leitner <marcelo.leitner@...il.com>,
	Eric Dumazet <eric.dumazet@...il.com>
Subject: [PATCH v3 net-next 5/7] sctp: prepare for socket backlog behavior change

sctp_inq_push() will soon be called without BH being blocked
when generic socket code flushes the socket backlog.

It is very possible SCTP can be converted to not rely on BH,
but this needs to be done by SCTP experts.

Signed-off-by: Eric Dumazet <edumazet@...gle.com>
---
 net/sctp/inqueue.c | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/net/sctp/inqueue.c b/net/sctp/inqueue.c
index b335ffcef0b9..9d87bba0ff1d 100644
--- a/net/sctp/inqueue.c
+++ b/net/sctp/inqueue.c
@@ -89,10 +89,12 @@ void sctp_inq_push(struct sctp_inq *q, struct sctp_chunk *chunk)
 	 * Eventually, we should clean up inqueue to not rely
 	 * on the BH related data structures.
 	 */
+	local_bh_disable();
 	list_add_tail(&chunk->list, &q->in_chunk_list);
 	if (chunk->asoc)
 		chunk->asoc->stats.ipackets++;
 	q->immediate.func(&q->immediate);
+	local_bh_enable();
 }
 
 /* Peek at the next chunk on the inqeue. */
-- 
2.8.0.rc3.226.g39d4020