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libceph: fix mutex coverage for ceph_con_close

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(cherry picked from commit 8c50c81756)

Hold the mutex while twiddling all of the state bits to avoid possible
races.  While we're here, make not of why we cannot close the socket
directly.

Signed-off-by: Sage Weil <sage@inktank.com>
Reviewed-by: Alex Elder <elder@inktank.com>
Reviewed-by: Yehuda Sadeh <yehuda@inktank.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Sage Weil 2012-07-30 16:24:37 -07:00 committed by Greg Kroah-Hartman
parent b3fd00b734
commit 7621822a64
1 changed files with 7 additions and 1 deletions
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8
net/ceph/messenger.c
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@ -503,6 +503,7 @@ static void reset_connection(struct ceph_connection *con)
*/
void ceph_con_close(struct ceph_connection *con)
{
mutex_lock(&con->mutex);
dout("con_close %p peer %s\n", con,
ceph_pr_addr(&con->peer_addr.in_addr));
clear_bit(NEGOTIATING, &con->state);
@ -515,11 +516,16 @@ void ceph_con_close(struct ceph_connection *con)
clear_bit(KEEPALIVE_PENDING, &con->flags);
clear_bit(WRITE_PENDING, &con->flags);
mutex_lock(&con->mutex);
reset_connection(con);
con->peer_global_seq = 0;
cancel_delayed_work(&con->work);
mutex_unlock(&con->mutex);
/*
* We cannot close the socket directly from here because the
* work threads use it without holding the mutex. Instead, let
* con_work() do it.
*/
queue_con(con);
}
EXPORT_SYMBOL(ceph_con_close);