| From | Greg Kroah-Hartman <> | Subject | [ 144/171] libceph: protect ceph_con_open() with mutex | Date | Wed, 21 Nov 2012 16:41:30 -0800 |
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3.4-stable review patch. If anyone has any objections, please let me know.
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From: Sage Weil <sage@inktank.com>
(cherry picked from commit 5469155f2bc83bb2c88b0a0370c3d54d87eed06e)
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@inktank.com> Reviewed-by: Yehuda Sadeh <yehuda@inktank.com> Reviewed-by: Alex Elder <elder@inktank.com> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org> --- net/ceph/messenger.c | 2 ++ 1 file changed, 2 insertions(+)
--- a/net/ceph/messenger.c +++ b/net/ceph/messenger.c @@ -537,6 +537,7 @@ void ceph_con_open(struct ceph_connectio __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_connectio 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);
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