From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from out3-smtp.messagingengine.com ([66.111.4.27]:53195 "EHLO out3-smtp.messagingengine.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1161690AbcE3ULG (ORCPT ); Mon, 30 May 2016 16:11:06 -0400 Subject: FAILED: patch "[PATCH] md: md.c: fix oops in mddev_suspend for raid0" failed to apply to 4.5-stable tree To: heinzm@redhat.com, shli@fb.com Cc: From: Date: Mon, 30 May 2016 13:11:04 -0700 Message-ID: <14646390646486@kroah.com> MIME-Version: 1.0 Content-Type: text/plain; charset=ANSI_X3.4-1968 Content-Transfer-Encoding: 8bit Sender: stable-owner@vger.kernel.org List-ID: The patch below does not apply to the 4.5-stable tree. If someone wants it applied there, or to any other stable or longterm tree, then please email the backport, including the original git commit id to . thanks, greg k-h ------------------ original commit in Linus's tree ------------------ >>From 092398dce8c2406bfb0c9eebc3e764ff2ddb62a8 Mon Sep 17 00:00:00 2001 From: Heinz Mauelshagen Date: Tue, 3 May 2016 19:43:57 +0200 Subject: [PATCH] md: md.c: fix oops in mddev_suspend for raid0 Introduced by upstream commit 70d9798b95562abac005d4ba71d28820f9a201eb The raid0 personality does not create mddev->thread as oposed to other personalities leading to its unconditional access in mddev_suspend() causing an oops. Patch checks for mddev->thread in order to keep the intention of aforementioned commit. Fixes: 70d9798b9556 ("MD: warn for potential deadlock") Cc: stable@vger.kernel.org (4.5+) Signed-off-by: Heinz Mauelshagen Signed-off-by: Shaohua Li diff --git a/drivers/md/md.c b/drivers/md/md.c index 06f6e81f1516..23c6d732a374 100644 --- a/drivers/md/md.c +++ b/drivers/md/md.c @@ -307,7 +307,7 @@ static blk_qc_t md_make_request(struct request_queue *q, struct bio *bio) */ void mddev_suspend(struct mddev *mddev) { - WARN_ON_ONCE(current == mddev->thread->tsk); + WARN_ON_ONCE(mddev->thread && current == mddev->thread->tsk); if (mddev->suspended++) return; synchronize_rcu();