From mboxrd@z Thu Jan  1 00:00:00 1970
From: keith.busch@intel.com (Keith Busch)
Date: Tue, 2 Feb 2016 05:29:16 +0000
Subject: [PATCH 1/2] NVMe: Make surprise removal work again
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On Tue, Feb 02, 2016@02:41:53AM +0000, Wenbo Wang wrote:
> Is it confirmed that blk_cleanup_queue has returned? It is likely the driver stuck in del_gendisk.

Yes, the entire driver's remove completes, which includes
blk_cleanup_queue and del_gendisk.

I don't know what the task is waiting for, but recall this worked
before. Might bisect.