[PATCH 10/17] nvme: switch controller refcounting to use struct device

[hare@suse.de (Hannes Reinecke)]

On 10/23/2017 04:51 PM, Christoph Hellwig wrote:
> Instead of allocating a separate struct device for the character device
> handle embedd it into struct nvme_ctrl and use it for the main controller
> refcounting.  This removes double refcounting and gets us an automatic
> reference for the character device operations.  We keep ctrl->device as a
> pointer for now to avoid chaning printks all over, but in the future we
> could look into message printing helpers that take a controller structure
> similar to what other subsystems do.
> 
> Note the delete_ctrl operation always already has a reference (either
> through sysfs due this change, or because every open file on the
> /dev/nvme-fabrics node has a refernece) when it is entered now, so we
> don't need to do the unless_zero variant there.
> 
> Signed-off-by: Christoph Hellwig <hch at lst.de>
> ---
>  drivers/nvme/host/core.c   | 43 ++++++++++++++++++++++---------------------
>  drivers/nvme/host/fc.c     |  8 ++------
>  drivers/nvme/host/nvme.h   | 12 +++++++++++-
>  drivers/nvme/host/pci.c    |  2 +-
>  drivers/nvme/host/rdma.c   |  5 ++---
>  drivers/nvme/target/loop.c |  2 +-
>  6 files changed, 39 insertions(+), 33 deletions(-)
> Round of applause for this :-)

Reviewed-by: Hannes Reinecke <hare at suse.com>

Cheers,

Hannes
-- 
Dr. Hannes Reinecke		   Teamlead Storage & Networking
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