linux-kernel - Re: [PATCH 2/2] nvme-core: Fix deadlock when deleting the ctrl while scanning

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Date:   Fri, 19 Jul 2019 13:15:50 -0700
From:   Sagi Grimberg <sagi@...mberg.me>
To:     Logan Gunthorpe <logang@...tatee.com>,
        linux-kernel@...r.kernel.org, linux-nvme@...ts.infradead.org
Cc:     Keith Busch <kbusch@...nel.org>, Jens Axboe <axboe@...com>,
        Christoph Hellwig <hch@....de>
Subject: Re: [PATCH 2/2] nvme-core: Fix deadlock when deleting the ctrl while
 scanning


>> [1]:
> Or actually:
> -- 
> diff --git a/drivers/nvme/host/core.c b/drivers/nvme/host/core.c
> index 76cd3dd8736a..a0e2072fe73e 100644
> --- a/drivers/nvme/host/core.c
> +++ b/drivers/nvme/host/core.c
> @@ -3576,6 +3576,12 @@ void nvme_remove_namespaces(struct nvme_ctrl *ctrl)
>          struct nvme_ns *ns, *next;
>          LIST_HEAD(ns_list);
> 
> +       mutex_lock(&ctrl->scan_lock);
> +       list_for_each_entry(ns, &ctrl->namespaces, list)
> +               if (nvme_mpath_clear_current_path(ns))
> +                       kblockd_schedule_work(&ns->head->requeue_work);
> +       mutex_lock(&ctrl->scan_lock);

This should be mutex_unlock of course...