linux-kernel - Re: [PATCH 1/3] cdev: Finish the cdev api with queued mode support

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Message-ID: <20210120194609.GA3843758@infradead.org>
Date:   Wed, 20 Jan 2021 19:46:09 +0000
From:   Christoph Hellwig <hch@...radead.org>
To:     Dan Williams <dan.j.williams@...el.com>
Cc:     gregkh@...uxfoundation.org, logang@...tatee.com,
        Hans Verkuil <hans.verkuil@...co.com>,
        Alexandre Belloni <alexandre.belloni@...e-electrons.com>,
        Alexander Viro <viro@...iv.linux.org.uk>,
        linux-kernel@...r.kernel.org, linux-nvdimm@...ts.01.org
Subject: Re: [PATCH 1/3] cdev: Finish the cdev api with queued mode support

The subject doesn't make any sense to me.

But thn again queued sound really weird.  You just have a managed
API with a refcount and synchronization, right?

procfs and debugfs already support these kind of managed ops, kinda sad
to duplicate this concept yet another time.

> +static long cdev_queued_ioctl(struct file *file, unsigned int cmd, unsigned long arg)

Overly long line.

> +__must_check int __cdev_register_queued(struct cdev *cdev, struct module *owner,
> +					dev_t dev, unsigned count,
> +					const struct cdev_operations *qops)
> +{
> +	int rc;
> +
> +	if (!qops->ioctl || !owner)
> +		return -EINVAL;

Why is the ioctl method mandatory?