[ 3.5.yuz extended stable ] Patch "libceph: protect ceph_con_open() with mutex" has been added to staging queue

[Herton Ronaldo Krzesinski]

This is a note to let you know that I have just added a patch titled

    libceph: protect ceph_con_open() with mutex

to the linux-3.5.y-queue branch of the 3.5.yuz extended stable tree 
which can be found at:

 http://kernel.ubuntu.com/git?p=ubuntu/linux.git;a=shortlog;h=refs/heads/linux-3.5.y-queue

If you, or anyone else, feels it should not be added to this tree, please 
reply to this email.

For more information about the 3.5.yuz tree, see
https://wiki.ubuntu.com/Kernel/Dev/ExtendedStable

Thanks.
-Herton

------

>From eff994c3666d7d0b0e29283806ae6b781cf96777 Mon Sep 17 00:00:00 2001
From: Sage Weil <sage at inktank.com>
Date: Mon, 30 Jul 2012 16:21:40 -0700
Subject: [PATCH 52/78] libceph: protect ceph_con_open() with mutex

commit 5469155f2bc83bb2c88b0a0370c3d54d87eed06e upstream.

Take the con mutex while we are initiating a ceph open.  This is necessary
because the may have previously been in use and then closed, which could
result in a racing workqueue running con_work().

Signed-off-by: Sage Weil <sage at inktank.com>
Reviewed-by: Yehuda Sadeh <yehuda at inktank.com>
Reviewed-by: Alex Elder <elder at inktank.com>
Signed-off-by: Herton Ronaldo Krzesinski <herton.krzesinski at canonical.com>
---
 net/ceph/messenger.c |    2 ++
 1 file changed, 2 insertions(+)

diff --git a/net/ceph/messenger.c b/net/ceph/messenger.c
index f1bd3bb..a477998 100644
--- a/net/ceph/messenger.c
+++ b/net/ceph/messenger.c
@@ -537,6 +537,7 @@ void ceph_con_open(struct ceph_connection *con,
 		   __u8 entity_type, __u64 entity_num,
 		   struct ceph_entity_addr *addr)
 {
+	mutex_lock(&con->mutex);
 	dout("con_open %p %s\n", con, ceph_pr_addr(&addr->in_addr));
 	set_bit(OPENING, &con->state);
 	WARN_ON(!test_and_clear_bit(CLOSED, &con->state));
@@ -546,6 +547,7 @@ void ceph_con_open(struct ceph_connection *con,

 	memcpy(&con->peer_addr, addr, sizeof(*addr));
 	con->delay = 0;      /* reset backoff memory */
+	mutex_unlock(&con->mutex);
 	queue_con(con);
 }
 EXPORT_SYMBOL(ceph_con_open);
--
1.7.9.5