On Mon, Apr 26, 2021 at 10:53:10AM +0800, taochiu wrote:

From: Tao Chiu <redacted>

queue_rq() in pci only checks if the dispatched queue (nvmeq) is ready,
e.g. not being suspended. Since nvme_alloc_admin_tags() in reset flow
restarts the admin queue, users are able to submit admin commands to a
controller before reset_work() completes. Commands submitted under this
condition may interfere with commands that performs identify, IO queue
setup in reset_work(), and may result in a hang described in the
following patch.

As seen in the fabrics, user commands are prevented from being executed
under inproper controller states. We may reuse this logic to maintain a
clear admin queue during reset_work().

Signed-off-by: Tao Chiu <redacted>
Signed-off-by: Cody Wong <redacted>
Reviewed-by: Leon Chien <redacted>

The series looks good.

Reviewed-by: Keith Busch <kbusch@kernel.org>