libceph: protect ceph_con_open() with mutex
authorSage Weil <sage@inktank.com>
Mon, 30 Jul 2012 23:21:40 +0000 (16:21 -0700)
committerSage Weil <sage@inktank.com>
Tue, 31 Jul 2012 01:15:33 +0000 (18:15 -0700)
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>
net/ceph/messenger.c

index f1bd3bbb0c46162fd4531464dffc028914009da5..a4779988c8475f6de52bbf2c269a50672bab66e8 100644 (file)
@@ -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);