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

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Date:	Fri, 25 May 2012 13:34:56 +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 11:01 AM, Kay Sievers <kay@...y.org> wrote:
> 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.

Jeff,

if you still need to keep your static /dev setup, can you please try:
  $ mkdir /dev/bus
  $ mount -t devtmpfs none /dev/bus
  $ mount --bind /dev/bus/bus /dev/bus

This should replace the yucky usbfs nodes at /proc/bus/ with the usual
/dev/bus/ kernel-managed device nodes. It tricks the usually used /dev
devtmpfs, into just providing /dev/bus/ on top of your static /dev.

VMWare should pick up this directory, just like it works for all usual
distro-like setups, and find the dynamically managed USB devices.

Kay
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