linux-kernel - [PATCH 4.9 049/101] libceph: no need to drop con->mutex for ->get

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Message-Id: <20181206143014.373934330@linuxfoundation.org>
Date:   Thu,  6 Dec 2018 15:38:48 +0100
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     linux-kernel@...r.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        stable@...r.kernel.org, Ilya Dryomov <idryomov@...il.com>,
        Sage Weil <sage@...hat.com>,
        Ben Hutchings <ben.hutchings@...ethink.co.uk>
Subject: [PATCH 4.9 049/101] libceph: no need to drop con->mutex for ->get_authorizer()

4.9-stable review patch.  If anyone has any objections, please let me know.

------------------

From: Ilya Dryomov <idryomov@...il.com>

commit b3bbd3f2ab19c8ca319003b4b51ce4c4ca74da06 upstream.

->get_authorizer(), ->verify_authorizer_reply(), ->sign_message() and
->check_message_signature() shouldn't be doing anything with or on the
connection (like closing it or sending messages).

Signed-off-by: Ilya Dryomov <idryomov@...il.com>
Reviewed-by: Sage Weil <sage@...hat.com>
Signed-off-by: Ben Hutchings <ben.hutchings@...ethink.co.uk>
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
---
 net/ceph/messenger.c |    6 ------
 1 file changed, 6 deletions(-)

--- a/net/ceph/messenger.c
+++ b/net/ceph/messenger.c
@@ -1405,15 +1405,9 @@ static struct ceph_auth_handshake *get_c
 		return NULL;
 	}
 
-	/* Can't hold the mutex while getting authorizer */
-	mutex_unlock(&con->mutex);
 	auth = con->ops->get_authorizer(con, auth_proto, con->auth_retry);
-	mutex_lock(&con->mutex);
-
 	if (IS_ERR(auth))
 		return auth;
-	if (con->state != CON_STATE_NEGOTIATING)
-		return ERR_PTR(-EAGAIN);
 
 	con->auth_reply_buf = auth->authorizer_reply_buf;
 	con->auth_reply_buf_len = auth->authorizer_reply_buf_len;