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

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Message-ID: <CAAJw_ZtaeAV2nZU7LcyngJTN15YVn+8y2dMPxtBqTGn750Tjdg@mail.gmail.com>
Date:	Fri, 25 May 2012 13:48:06 +0800
From:	Jeff Chua <jeff.chua.linux@...il.com>
To:	Greg Kroah-Hartman <gregkh@...uxfoundation.org>
Cc:	Alan Stern <stern@...land.harvard.edu>, linux-usb@...r.kernel.org,
	linux-kernel@...r.kernel.org, Kay Sievers <kay@...y.org>
Subject: Re: [RFC PATCH] USB: remove CONFIG_USB_DEVICEFS

On Fri, May 25, 2012 at 5:52 AM, Greg Kroah-Hartman
<gregkh@...uxfoundation.org> wrote:
> On Thu, May 24, 2012 at 11:55:16PM +0800, Jeff Chua wrote:
>> On Thu, Apr 26, 2012 at 11:12 PM, Greg Kroah-Hartman
>> <gregkh@...uxfoundation.org> wrote:
>> > On Thu, Apr 26, 2012 at 11:06:45AM -0400, Alan Stern wrote:
>> >> On Wed, 25 Apr 2012, Greg Kroah-Hartman wrote:
>> >>
>> >> > This option has been deprecated for many years now, and no userspace
>> >> > tools use it anymore, so it should be safe to finally remove it.
>> >> >
>> >> > Reported-by: Kay Sievers <kay@...y.org>
>> >> > Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
>> >> >
>> >> > Anyone object to me queuing this up for the 3.5 kernel release?
>> >>
>> >> I'm not sure about this.  There are a few systems still floating around
>> >> that don't use udev; on those systems /proc/bus/usb is the only way for
>> >> user programs to control USB devices.  Admittedly, I have no idea
>> >> whether any such systems will be using 3.5 or later kernels...
>> >
>> > They don't have to use udev, they can use devtmpfs (which is what the
>> > majority of embedded systems use today), or they can just use static
>> > device nodes to get access to these devices, the char node is still
>> > present, we aren't getting rid of them at all.
>>
>> Looks like vmware is breaking. Can't find any usb devices. I'm not using udev.
>
> vmware doesn't use usbfs, otherwise how would it be working on all of
> the systems out there that haven't mounted usbfs for years?
>
> What exactly broke?  What version of vmware are you using, and is the
> problem in the guest or host?
>
> We delayed other usbfs changes for years due to vmware "issues", it
> wouldn't be the first time we've had to handle this :(


VMWare workstation 8.0.3

# vmware-usbarbitrator -f --info
DICT       product.buildNumber = 703057
DICT           product.version = 8.0.3
DICT workstation.product.version = 8.0.3
DICT              product.name = VMware Workstation
VMware USB Arbitration Service Version 8.4.19
USB: Unable to open "/proc/bus/usb/devices" (No such file or directory).
No USB enumerator!

If I revert back to git pull 3 years earlier, it works.

Thanks,
Jeff
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