linux-kernel - Re: [PATCH V2] nvme: fix nvme_remove going to uninterruptible sleep for ever

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Message-ID: <20170601114338.GA24855@lst.de>
Date:   Thu, 1 Jun 2017 13:43:38 +0200
From:   Christoph Hellwig <hch@....de>
To:     Rakesh Pandit <rakesh@...era.com>
Cc:     Sagi Grimberg <sagi@...mberg.me>, linux-nvme@...ts.infradead.org,
        linux-kernel@...r.kernel.org, Jens Axboe <axboe@...com>,
        Keith Busch <keith.busch@...el.com>,
        Christoph Hellwig <hch@....de>,
        Andy Lutomirski <luto@...nel.org>
Subject: Re: [PATCH V2] nvme: fix nvme_remove going to uninterruptible
        sleep for ever

On Tue, May 30, 2017 at 05:23:46PM +0300, Rakesh Pandit wrote:
> We can fix user-space triggered set_features higger up e.g. in
> nvme_ioctl by putting same check.  Introduction of a separate state
> NVME_CTRL_SCHED_RESET (being discussed in another thread) has
> additional advantage of making sure that only one thread is going
> through resetting and eventually through removal (if required) and
> solves lot of problems.

I think we need the NVME_CTRL_SCHED_RESET state.  In fact I'm pretty
sure some time in the past I already had it in a local tree as a
generalization of rdma and loop already use NVME_CTRL_RESETTING
(they set it before queueing the reset work).

But I don't fully understand how the NVME_CTRL_SCHED_RESET fix is
related to this patch?