Re: [PATCH v3 3/8] nvme: add error handling support for add_disk()

Hannes Reinecke
2021-09-06T06:16:38Z

On 8/30/21 11:25 PM, Luis Chamberlain wrote:
> We never checked for errors on add_disk() as this function
> returned void. Now that this is fixed, use the shiny new
> error handling.
>
> Reviewed-by: Christoph Hellwig <hch@lst.de>
> Signed-off-by: Luis Chamberlain <mcgrof@kernel.org>
> ---
> drivers/nvme/host/core.c | 9 ++++++++-
> 1 file changed, 8 insertions(+), 1 deletion(-)
>
> diff --git a/drivers/nvme/host/core.c b/drivers/nvme/host/core.c
> index 8679a108f571..687d3be563a3 100644
> --- a/drivers/nvme/host/core.c
> +++ b/drivers/nvme/host/core.c
> @@ -3763,7 +3763,9 @@ static void nvme_alloc_ns(struct nvme_ctrl *ctrl, unsigned nsid,
>
> nvme_get_ctrl(ctrl);
>
> - device_add_disk(ctrl->device, ns->disk, nvme_ns_id_attr_groups);
> + if (device_add_disk(ctrl->device, ns->disk, nvme_ns_id_attr_groups))
> + goto out_cleanup_ns_from_list;
> +
> if (!nvme_ns_head_multipath(ns->head))
> nvme_add_ns_cdev(ns);
>
> @@ -3773,6 +3775,11 @@ static void nvme_alloc_ns(struct nvme_ctrl *ctrl, unsigned nsid,
>
> return;
>
> + out_cleanup_ns_from_list:
> + nvme_put_ctrl(ctrl);
> + down_write(&ctrl->namespaces_rwsem);
> + list_del_init(&ns->list);
> + up_write(&ctrl->namespaces_rwsem);
> out_unlink_ns:
> mutex_lock(&ctrl->subsys->lock);
> list_del_rcu(&ns->siblings);
>
I would rather turn this around, and call 'nvme_put_ctrl()' after
removing the namespace from the list. But it's probably more a style
issue, come to think of it.

Reviewed-by: Hannes Reinecke <hare@suse.de>

Cheers,

Hannes
--
Dr. Hannes Reinecke Kernel Storage Architect
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