libftdi Archives

Subject: Re: (Corrected)In linusb-1.0, libusb_detach_kernel_driver is available unconditional

From: Thomas Jarosch <thomas.jarosch@xxxxxxxxxxxxx>
To: libftdi@xxxxxxxxxxxxxxxxxxxxxxx
Date: Tue, 18 May 2010 14:13:07 +0200
On Tuesday, 18. May 2010 13:43:53 Xiaofan Chen wrote:
> That is exactly right. And I think failure to detach the kernel driver is
> quite normal (eg: you already run libftdi once and the kernel driver
> is already detached) and should not return error. A warning is enough.
>     ret = libusb_detach_kernel_driver(ftdi->usb_dev, ftdi->interface);
>     if (ret < 0 && ret != LIBUSB_ERROR_NOT_FOUND)
>         ftdi_error_return(-11, "libusb_detach_kernel_driver () failed");

That's the reason we already ignore LIBUSB_ERROR_NOT_FOUND ;) I never had 
trouble with the detach code. If the detach really fails
(except _NOT_FOUND and _NOT_SUPPORTED), then we should abort with an error.


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