On Thu, 16 Nov 2006, Jim wrote:
> Hi,
>
> I am running a usb driver based on usb-skeleton.c, when a device plugged
> in, the skel_probe() was called, but stop at following error of
> "Couldn't find both bulk-in and bulk-out endpoints" and my ARM system
> crashed at "Unable to handle kernel NULL pointer":
>
> if (!(dev->bulk_in_endpointAddr && dev->bulk_out_endpointAddr)) {
> err("Couldn't find both bulk-in and bulk-out endpoints");
> goto error;
> }
>
> The configuration of endpoint for bulk-in and bulk-out at following was
> not called. Is the value of iface_desc = &interface->altsetting[0]
> assigned from the device or core? I guess I tried to figure out where
> the problem was from the device or core.
The descriptor value comes from the device. You can view the values in
/proc/bus/usb/devices.
Alan Stern
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