linux-kernel - Re: [PATCH v2] nvme-pci: Shutdown when removing dead controller

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Date:   Mon, 7 Oct 2019 12:28:12 -0600
From:   Keith Busch <kbusch@...nel.org>
To:     Tyler Ramer <tyaramer@...il.com>
Cc:     Jens Axboe <axboe@...com>, Christoph Hellwig <hch@....de>,
        Sagi Grimberg <sagi@...mberg.me>,
        linux-nvme@...ts.infradead.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH v2] nvme-pci: Shutdown when removing dead controller

On Mon, Oct 07, 2019 at 01:50:11PM -0400, Tyler Ramer wrote:
> Shutdown the controller when nvme_remove_dead_controller is
> reached.
> 
> If nvme_remove_dead_controller() is called, the controller won't
> be comming back online, so we should shut it down rather than just
> disabling.
> 
> Remove nvme_kill_queues() as nvme_dev_remove() will take care of
> unquiescing queues.


We do still need to kill the queues, though. The shutdown == true just flushes
all pending requests. Killing queues does that too, but it also sets the
request_queue to dying, which will terminate syncing any dirty pages.
 
> ---
> 
> Changes since v1:
>     * Clean up commit message
>     * Remove nvme_kill_queues()
> ---
>  drivers/nvme/host/pci.c | 3 +--
>  1 file changed, 1 insertion(+), 2 deletions(-)
> 
> diff --git a/drivers/nvme/host/pci.c b/drivers/nvme/host/pci.c
> index c0808f9eb8ab..68d5fb880d80 100644
> --- a/drivers/nvme/host/pci.c
> +++ b/drivers/nvme/host/pci.c
> @@ -2509,8 +2509,7 @@ static void nvme_pci_free_ctrl(struct nvme_ctrl *ctrl)
>  static void nvme_remove_dead_ctrl(struct nvme_dev *dev)
>  {
>  	nvme_get_ctrl(&dev->ctrl);
> -	nvme_dev_disable(dev, false);
> -	nvme_kill_queues(&dev->ctrl);
> +	nvme_dev_disable(dev, true);
>  	if (!queue_work(nvme_wq, &dev->remove_work))
>  		nvme_put_ctrl(&dev->ctrl);
>  }
> -- 
> 2.23.0
>