Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S933265Ab2KZRIe (ORCPT ); Mon, 26 Nov 2012 12:08:34 -0500 Received: from youngberry.canonical.com ([91.189.89.112]:47646 "EHLO youngberry.canonical.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S933252Ab2KZRI3 (ORCPT ); Mon, 26 Nov 2012 12:08:29 -0500 From: Herton Ronaldo Krzesinski To: linux-kernel@vger.kernel.org, stable@vger.kernel.org, kernel-team@lists.ubuntu.com Cc: Sage Weil , Herton Ronaldo Krzesinski Subject: [PATCH 138/270] libceph: verify state after retaking con lock after dispatch Date: Mon, 26 Nov 2012 14:57:08 -0200 Message-Id: <1353949160-26803-139-git-send-email-herton.krzesinski@canonical.com> X-Mailer: git-send-email 1.7.9.5 In-Reply-To: <1353949160-26803-1-git-send-email-herton.krzesinski@canonical.com> References: <1353949160-26803-1-git-send-email-herton.krzesinski@canonical.com> Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 1479 Lines: 49 3.5.7u1 -stable review patch. If anyone has any objections, please let me know. ------------------ From: Sage Weil commit 7b862e07b1a4d5c963d19027f10ea78085f27f9b upstream. 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 Reviewed-by: Alex Elder Signed-off-by: Herton Ronaldo Krzesinski --- net/ceph/messenger.c | 3 ++- 1 file changed, 2 insertions(+), 1 deletion(-) diff --git a/net/ceph/messenger.c b/net/ceph/messenger.c index a6a0c7a..feb5a2a 100644 --- a/net/ceph/messenger.c +++ b/net/ceph/messenger.c @@ -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 @@ more: 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) { -- 1.7.9.5 -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/