linux-kernel - Re: [take4 1/4] kevent: Core files.

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Date:	Sat, 5 Aug 2006 10:57:02 -0700
From:	Greg KH <greg@...ah.com>
To:	Evgeniy Polyakov <johnpol@....mipt.ru>
Cc:	lkml <linux-kernel@...r.kernel.org>,
	David Miller <davem@...emloft.net>,
	Ulrich Drepper <drepper@...hat.com>,
	netdev <netdev@...r.kernel.org>,
	Zach Brown <zach.brown@...cle.com>
Subject: Re: [take4 1/4] kevent: Core files.

On Sat, Aug 05, 2006 at 05:02:38PM +0400, Evgeniy Polyakov wrote:
> +static int __devinit kevent_user_init(void)
> +{
> +	struct class_device *dev;
> +	int err = 0;
> +	
> +	err = register_filesystem(&kevent_fs_type);
> +	if (err)
> +		panic("%s: failed to register filesystem: err=%d.\n",
> +			       kevent_name, err);
> +
> +	kevent_mnt = kern_mount(&kevent_fs_type);
> +	if (IS_ERR(kevent_mnt))
> +		panic("%s: failed to mount silesystem: err=%ld.\n", 
> +				kevent_name, PTR_ERR(kevent_mnt));
> +	
> +	kevent_user_major = register_chrdev(0, kevent_name, &kevent_user_fops);
> +	if (kevent_user_major < 0) {
> +		printk(KERN_ERR "Failed to register \"%s\" char device: err=%d.\n", 
> +				kevent_name, kevent_user_major);
> +		return -ENODEV;
> +	}
> +
> +	kevent_user_class = class_create(THIS_MODULE, "kevent");
> +	if (IS_ERR(kevent_user_class)) {
> +		printk(KERN_ERR "Failed to register \"%s\" class: err=%ld.\n", 
> +				kevent_name, PTR_ERR(kevent_user_class));
> +		err = PTR_ERR(kevent_user_class);
> +		goto err_out_unregister;
> +	}
> +
> +	dev = class_device_create(kevent_user_class, NULL, 
> +			MKDEV(kevent_user_major, 0), NULL, kevent_name);
> +	if (IS_ERR(dev)) {
> +		printk(KERN_ERR "Failed to create %d.%d class device in \"%s\" class: err=%ld.\n", 
> +				kevent_user_major, 0, kevent_name, PTR_ERR(dev));
> +		err = PTR_ERR(dev);
> +		goto err_out_class_destroy;
> +	}

As you are only using 1 minor number in this code, why not just use a
miscdevice instead?  It saves a bit of overhead and makes the code a
tiny bit smaller :)

thanks,

greg k-h
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