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libceph: protect ceph_con_open() with mutex

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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>
This commit is contained in:
Sage Weil 2012-07-30 16:21:40 -07:00
parent a53aab645c
commit 5469155f2b
1 changed files with 2 additions and 0 deletions
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2
net/ceph/messenger.c
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@ -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);