On Fri, Jan 02, 2009 at 02:01:21AM -0500, Mark Lord wrote: > 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. 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. Hope this helps, greg k-h -- To unsubscribe from this list: send the line "unsubscribe linux-usb" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
