From mboxrd@z Thu Jan  1 00:00:00 1970
From: sagig@dev.mellanox.co.il (Sagi Grimberg)
Date: Thu, 11 Feb 2016 15:00:48 +0200
Subject: [PATCH for-4.5 12/13] NVMe: Mark queues as dead on degraded
 controller
In-Reply-To: <1455128250-5984-13-git-send-email-keith.busch@intel.com>
References: <1455128250-5984-1-git-send-email-keith.busch@intel.com>
 <1455128250-5984-13-git-send-email-keith.busch@intel.com>
Message-ID: <56BC8600.1010902@dev.mellanox.co.il>


> If a previously optimal controller goes degraded, the IO queues will
> stop working, but the controller is still managable. Prior to removing
> namespace, we need to fail the queues so queued and new IO will fail
> and allow namespace removal to progress.
>
> Signed-off-by: Keith Busch <keith.busch at intel.com>
> ---
>   drivers/nvme/host/pci.c | 1 +
>   1 file changed, 1 insertion(+)
>
> diff --git a/drivers/nvme/host/pci.c b/drivers/nvme/host/pci.c
> index 7fd8a54..18c14f6 100644
> --- a/drivers/nvme/host/pci.c
> +++ b/drivers/nvme/host/pci.c
> @@ -1989,6 +1989,7 @@ static void nvme_reset_work(struct work_struct *work)
>   	 */
>   	if (dev->online_queues < 2) {
>   		dev_warn(dev->dev, "IO queues not created\n");
> +		nvme_kill_ns_queues(dev);

Another example why we need to document when should a driver
call this....