linux-kernel - Re: libusb broken on 2.6.28 x86

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Date:	Fri, 2 Jan 2009 00:28:24 -0800
From:	Greg KH <gregkh@...e.de>
To:	Mark Lord <lkml@....ca>
Cc:	Linux Kernel <linux-kernel@...r.kernel.org>,
	linux-usb@...r.kernel.org
Subject: Re: libusb broken on 2.6.28 x86_64 ?

On Fri, Jan 02, 2009 at 03:15:20AM -0500, Mark Lord wrote:
> Greg KH wrote:
>> On Fri, Jan 02, 2009 at 02:51:13AM -0500, Mark Lord wrote:
>>> Greg KH wrote:
>>>> On Fri, Jan 02, 2009 at 02:01:21AM -0500, Mark Lord wrote:
>>>>> Mark Lord wrote:
>>> ..
>>>>> Mmm.. broken only for 64-bit userspace, it seems.
>>>>>
>>>>> I've recompiled the same app against 32-bit libs,
>>>>> and it works just fine on that 64-bit system,
>>>>> as well as on 32-bit systems.
>>>>>
>>>>> But not when compiled for pure 64-bit operation on a 64-bit system.
>>> ..
>>>> Which version of libusb, a new one was just released a few weeks ago
>>>> that fixes a lot of problems reported in the older libusb versions, and
>>>> made things much faster to boot.  You might want to check it out.
>>> ..
>>>
>>> This is with libusb-0.1-4, which has been working fine with all prior 
>>> kernels,
>>> including the 2.6.27.xx series.
>>>
>>> Userspace stuff like this is not supposed to be broken from kernel to 
>>> kernel.
>> No it shouldn't, I was thinking this was the first time you had tried
>> such a thing (64bit userspace apps.)
>> If using 2.6.27 works, then we need to fix this.
> ..
>
> Yup.  I don't really see anything likely in kernel from 2.6.27 to 2.6.28,
> other than perhaps the new "poisoning" code.  I wonder if that could be it?
>
> Kinda weird that the device works with libusb the first time it is used,
> but then fails on all subsequent runs of the same app, until replugged.
>
> But.. I can run the 32-bit compat app after a 64-bit failure,
> and *that* does work.  There's gotta be a useful clue in there somewhere.

Hm, care to run 'git bisect'?

Or do you have a simple (or complex) test program that I can run here to
do the same thing?

thanks,

greg k-h
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