linux-kernel - Re: libusb broken on 2.6.28 x86

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Date:	Fri, 02 Jan 2009 02:01:21 -0500
From:	Mark Lord <lkml@....ca>
To:	Greg KH <gregkh@...e.de>,
	Linux Kernel <linux-kernel@...r.kernel.org>,
	linux-usb@...r.kernel.org
Subject: Re: libusb broken on 2.6.28 x86_64 ?

Mark Lord wrote:
> I'm trying to use 2.6.28 for the first time on an x86_64 box here
> with devices controlled by libusb.  The devices work on the first
> access, but then fail on all subsequent accesses.  Unplugging/replugging
> causes them to work again for a single subsequent access.
> 
> This is with two completely different USB gadgets:
> a VFD alphanumeric display, and an FTDI serial device in bitbang mode.
> 
> Did something break in 2.6.28 for libusb devices ??
..

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.

Looks tricky .. must be a change somewhere that assumes
a pointer/long is 32-bits or something.

-ml
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