Re: A QUESTION ABOUT USB DRIVER

[Greg KH <greg@kroah.com>]

On Mon, Jan 11, 2010 at 01:14:31PM +0800, Steven Xu wrote:
> output: usb 1-1: device descriptor read/64, error -71
> 
> 
> in drivers/usb/core/hub.c  line 2250
> when a udisk inserted run to here
>                         for (j = 0; j < 3; ++j) {
>                                 buf->bMaxPacketSize0 = 0;
> 
>                                 r = usb_control_msg(udev, usb_rcvaddr0pipe(),
>                                         USB_REQ_GET_DESCRIPTOR, USB_DIR_IN,
>                                         USB_DT_DEVICE << 8, 0,
>                                         buf, GET_DESCRIPTOR_BUFSIZE,
>                                         (i ? USB_CTRL_GET_TIMEOUT : 1000));
>  return r=-74,
> 
> WHAT IS THE POSSIBEL REASON FOR THIS?

It is needed, why, are you having problems with it?

thanks,

greg k-h