Re: [Libusbx-devel] [PATCH] detach-kernel-driver: return -EBUSY if another libusb app is active

[Xiaofan C. <xia...@gm...>]

On Sat, Jul 28, 2012 at 5:54 PM, Hans de Goede <hde...@re...> wrote:
> Currently applications for devices which only are accessed from
> userspace can use claim / release interface to make sure they
> don't get in each others way. The same however does not work
> for applications which first need to detach
> a "native" / in kernel driver, as this detach will not only detach native
> drivers but also the usbfs driver, thus stealing the device from another
> userspace / libusb app.
>
> This patch fixes libusb_detach_kernel_driver to only detach "real" kernel
> drivers and not the special usbfs driver used for userspace access to
> USB devices. If the usbfs driver is found LIBUSB_ERROR_BUSY will be
> returned.

Hmm, what if no other applications are using the device and
usbfs is attached to the device? In that case, there should be
no error.

Related ticket:
https://github.com/libusbx/libusbx/issues/20
https://github.com/libusbx/libusbx/issues/17

-- 
Xiaofan