linux-kernel - Re: [RFC PATCH] USB: remove CONFIG_USB

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Message-ID: <CAPXgP10bzpJ1vEX9SqddV2qr9AuNY-fgZN444S-pYNM21ByBOA@mail.gmail.com>
Date:	Fri, 25 May 2012 11:01:09 +0200
From:	Kay Sievers <kay@...y.org>
To:	Greg Kroah-Hartman <gregkh@...uxfoundation.org>
Cc:	Jeff Chua <jeff.chua.linux@...il.com>,
	Alan Stern <stern@...land.harvard.edu>,
	linux-usb@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [RFC PATCH] USB: remove CONFIG_USB_DEVICEFS

On Fri, May 25, 2012 at 9:16 AM, Greg Kroah-Hartman
<gregkh@...uxfoundation.org> wrote:
> On Fri, May 25, 2012 at 03:06:33PM +0800, Jeff Chua wrote:

>> >> VMware USB Arbitration Service Version 8.4.19
>> >> USB: Unable to open "/proc/bus/usb/devices" (No such file or directory).

I think vmware tries to open the usual /dev/bus/usb/ nodes directly
after it has tried the deprecated /proc nodes.

Udev would create the /dev/bus/ nodes.

Or the kernel would create them itself if:
  CONFIG_DEVTMPFS=y
  CONFIG_DEVTMPFS_MOUNT=y
is used.

> Use /dev/usb/ device nodes instead.  If you have a distro that has static
> device nodes, just add them to the package that has those nodes, and you
> should be fine.  That will bring you into the mid 2000's as far as
> device nodes go, I'm amazed that this hasn't been noticed before now.

Many distros have disabled the USB_DEVICEFS option and there are
usually no reports about problems any more.

But I guess the number of systems that want to run USB devices, and
pass them along to virtualization, but have an unmanaged static /dev
are close to one user these days. :)

Kay
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