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Date:   Thu, 21 Jan 2021 09:13:09 +0100
From:   Greg KH <gregkh@linuxfoundation.org>
To:     Dan Williams <dan.j.williams@intel.com>
Cc:     Logan Gunthorpe <logang@deltatee.com>,
        Hans Verkuil <hans.verkuil@cisco.com>,
        Alexandre Belloni <alexandre.belloni@free-electrons.com>,
        Alexander Viro <viro@zeniv.linux.org.uk>,
        Dave Jiang <dave.jiang@intel.com>, vishal.l.verma@intel.com,
        linux-kernel@vger.kernel.org, linux-nvdimm@lists.01.org
Subject: Re: [PATCH 1/3] cdev: Finish the cdev api with queued mode support
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References: <161117153248.2853729.2452425259045172318.stgit@dwillia2-desk3.amr.corp.intel.com>
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On Wed, Jan 20, 2021 at 11:38:57AM -0800, Dan Williams wrote:
> -void cdev_del(struct cdev *p)
> +void cdev_del(struct cdev *cdev)
>  {
> -	cdev_unmap(p->dev, p->count);
> -	kobject_put(&p->kobj);
> +	cdev_unmap(cdev->dev, cdev->count);
> +	kobject_put(&cdev->kobj);

After Christoph's patch series, the kobject in struct cdev does nothing,
so I will be removing it.  So I don't think this patch set is going to
do what you want :(

thanks,

greg k-h