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libceph: verify state after retaking con lock after dispatch

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(cherry picked from commit 7b862e07b1)

We drop the con mutex when delivering a message.  When we retake the
lock, we need to verify we are still in the OPEN state before
preparing to read the next tag, or else we risk stepping on a
connection that has been closed.

Signed-off-by: Sage Weil <sage@inktank.com>
Reviewed-by: Alex Elder <elder@inktank.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Sage Weil 2012-07-30 18:16:56 -07:00 committed by Greg Kroah-Hartman
parent da75ae3c0d
commit 900fbd910f
1 changed files with 2 additions and 1 deletions
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3
net/ceph/messenger.c
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@ -2003,7 +2003,6 @@ static void process_message(struct ceph_connection *con)
con->ops->dispatch(con, msg);
mutex_lock(&con->mutex);
prepare_read_tag(con);
}
@ -2213,6 +2212,8 @@ static int try_read(struct ceph_connection *con)
if (con->in_tag == CEPH_MSGR_TAG_READY)
goto more;
process_message(con);
if (con->state == CON_STATE_OPEN)
prepare_read_tag(con);
goto more;
}
if (con->in_tag == CEPH_MSGR_TAG_ACK) {