Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S933102Ab2KZRHb (ORCPT ); Mon, 26 Nov 2012 12:07:31 -0500 Received: from youngberry.canonical.com ([91.189.89.112]:47578 "EHLO youngberry.canonical.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S933019Ab2KZRH1 (ORCPT ); Mon, 26 Nov 2012 12:07:27 -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 122/270] libceph: fix mutex coverage for ceph_con_close Date: Mon, 26 Nov 2012 14:56:52 -0200 Message-Id: <1353949160-26803-123-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: 1856 Lines: 58 3.5.7u1 -stable review patch. If anyone has any objections, please let me know. ------------------ From: Sage Weil commit 8c50c817566dfa4581f82373aac39f3e608a7dc8 upstream. 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 Reviewed-by: Alex Elder Reviewed-by: Yehuda Sadeh Signed-off-by: Herton Ronaldo Krzesinski --- net/ceph/messenger.c | 8 +++++++- 1 file changed, 7 insertions(+), 1 deletion(-) diff --git a/net/ceph/messenger.c b/net/ceph/messenger.c index 6e2f678..e65b15d 100644 --- a/net/ceph/messenger.c +++ b/net/ceph/messenger.c @@ -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); -- 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/