linux-kernel - Re: [PATCH mm] sysfs: add /sys/dev/usb to handle CONFIG_USB_DEVICE

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Date:	Thu, 17 Apr 2008 20:21:46 -0700
From:	Greg KH <greg@...ah.com>
To:	Dan Williams <dan.j.williams@...el.com>
Cc:	Andrew Morton <akpm@...ux-foundation.org>,
	linux-kernel <linux-kernel@...r.kernel.org>,
	Kay Sievers <kay.sievers@...y.org>, linux-usb@...r.kernel.org
Subject: Re: [PATCH mm] sysfs: add /sys/dev/usb to handle
	CONFIG_USB_DEVICE_CLASS=y

On Thu, Apr 17, 2008 at 07:11:03PM -0700, Dan Williams wrote:
> The deprecated config option CONFIG_USB_DEVICE_CLASS causes class devices
> with duplicate major:minor numbers to be registered.  In effect they
> represent a usb specific address space for major:minor numbers so add 'usb'
> as a directory along side 'block' and 'char'.

Hm, no they do not, they are not a new address space, we are just
reusing them as the other user wasn't using them, and the code is
deprecated and will be removed eventually.  Neither of these char
devices are really hooked up to anything within the kernel, so it
doesn't matter yet.

I wonder how many other duplicates we have floating around...

thanks,

greg k-h
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