From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: From: Kamal Mostafa To: linux-kernel@vger.kernel.org, stable@vger.kernel.org, kernel-team@lists.ubuntu.com Cc: NeilBrown , Kamal Mostafa Subject: [PATCH 3.13 129/163] md/raid1: intialise start_next_window for READ case to avoid hang Date: Thu, 9 Oct 2014 14:02:34 -0700 Message-Id: <1412888588-26755-130-git-send-email-kamal@canonical.com> In-Reply-To: <1412888588-26755-1-git-send-email-kamal@canonical.com> References: <1412888588-26755-1-git-send-email-kamal@canonical.com> Sender: linux-kernel-owner@vger.kernel.org List-ID: 3.13.11.9 -stable review patch. If anyone has any objections, please let me know. ------------------ From: NeilBrown commit f0cc9a057151892b885be21a1d19b0185568281d upstream. r1_bio->start_next_window is not initialised in the READ case, so allow_barrier may incorrectly decrement conf->current_window_requests which can cause raise_barrier() to block forever. Fixes: 79ef3a8aa1cb1523cc231c9a90a278333c21f761 Reported-by: Brassow Jonathan Signed-off-by: NeilBrown Signed-off-by: Kamal Mostafa --- drivers/md/raid1.c | 1 + 1 file changed, 1 insertion(+) diff --git a/drivers/md/raid1.c b/drivers/md/raid1.c index f4d5e52..b806da4 100644 --- a/drivers/md/raid1.c +++ b/drivers/md/raid1.c @@ -1187,6 +1187,7 @@ read_again: atomic_read(&bitmap->behind_writes) == 0); } r1_bio->read_disk = rdisk; + r1_bio->start_next_window = 0; read_bio = bio_clone_mddev(bio, GFP_NOIO, mddev); bio_trim(read_bio, r1_bio->sector - bio->bi_sector, -- 1.9.1