Re: [PATCH] UBI: new module ubiblk: block layer on top of UBI

[Artem Bityutskiy <dedekind1@gmail.com>]

On Fri, 2011-06-24 at 15:34 +0200, david.wagner@free-electrons.com
wrote:
> +	/* Stolen from mtd_blkdevs.c */
> +	/* Create processing thread */
> +	dev->thread = kthread_run(ubi_ubiblk_thread, dev, "%s%d_%d",
> +				  "kubiblkd", dev->ubi_num, dev->vol_id);
> +	if (IS_ERR(dev->thread)) {
> +		ret = PTR_ERR(dev->thread);
> +		goto out_thread;
> +	}

Why we need a kernel thread? Could you please describe when exactly it
is needed and why we cannot avoid having it?

> +	ret = register_blkdev(0, "ubiblk");
> +	if (ret <= 0) {
> +		pr_err("UBIBLK: could not register_blkdev\n");
> +		return -ENODEV;
> +	}
> +	major = ret;
> +	pr_info("UBIBLK: device's major: %d\n", major);
> +
> +	mutex_init(&devtable_lock);
> +	ret = ubi_register_volume_notifier(&ubiblk_notifier, 0);
> +	if (ret < 0)
> +		return ret;

You should probably de-register the blkdev when you fail here.

-- 
Best Regards,
Artem Bityutskiy (Битюцкий Артём)