On Thu, Jan 26, 2017 at 12:52:15PM -0700, Jens Axboe wrote:

I screwed this up when splitting up the patchset, that last break needs to
be removed as well, of course. Updated below:


From 9d68cf9232c06a793e305d10b6d655df4beae928 Mon Sep 17 00:00:00 2001
From: Jens Axboe <axboe@fb.com>
Date: Thu, 26 Jan 2017 12:50:36 -0700
Subject: [PATCH 1/4] blk-mq: fix potential race in queue restart and driver
 tag allocation

Once we mark the queue as needing a restart, re-check if we can
get a driver tag. This fixes a theoretical issue where the needed
IO completes _after_ blk_mq_get_driver_tag() fails, but before we
manage to set the restart bit.

Reviewed-by: Omar Sandoval <redacted>

Signed-off-by: Jens Axboe <axboe@fb.com>
---
 block/blk-mq.c | 10 +++++++++-
 1 file changed, 9 insertions(+), 1 deletion(-)