From a59b55a602b6c741052d79c1e3643f8440cddd27 Mon Sep 17 00:00:00 2001
From: Sage Weil <sage@inktank.com>
Date: Fri, 20 Jul 2012 15:34:04 -0700
Subject: [PATCH] libceph: move ceph_con_send() closed check under the con
mutex
Take the con mutex before checking whether the connection is closed to
avoid racing with someone else closing it.
Signed-off-by: Sage Weil <sage@inktank.com>
---
net/ceph/messenger.c | 16 +++++++---------
1 file changed, 7 insertions(+), 9 deletions(-)
diff --git a/net/ceph/messenger.c b/net/ceph/messenger.c
index 1a3cb4a4f180..20e60a80bc29 100644
--- a/net/ceph/messenger.c
+++ b/net/ceph/messenger.c
@@ -2453,22 +2453,20 @@ static void clear_standby(struct ceph_connection *con)
*/
void ceph_con_send(struct ceph_connection *con, struct ceph_msg *msg)
{
- if (test_bit(CLOSED, &con->state)) {
- dout("con_send %p closed, dropping %p\n", con, msg);
- ceph_msg_put(msg);
- return;
- }
-
/* set src+dst */
msg->hdr.src = con->msgr->inst.name;
-
BUG_ON(msg->front.iov_len != le32_to_cpu(msg->hdr.front_len));
-
msg->needs_out_seq = true;
- /* queue */
mutex_lock(&con->mutex);
+ if (test_bit(CLOSED, &con->state)) {
+ dout("con_send %p closed, dropping %p\n", con, msg);
+ ceph_msg_put(msg);
+ mutex_unlock(&con->mutex);
+ return;
+ }
+
BUG_ON(msg->con != NULL);
msg->con = con->ops->get(con);
BUG_ON(msg->con == NULL);
--
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