On Thu, 27 Jan 2005, Orjan Friberg wrote:

> I did some testing with different count and size settings, and it turns out 
> that 
> testusb -t 14 runs fine for count 1 - 2 and size 2 - 64 bytes (with vary 1). 
> For size 1 I get error 22;

That error occurs whenever size <= vary.  I'm not sure why the test isn't
size < vary.

> for count > 2 I get error 74 (and "ctrl_out verify 
> failed" in the kernel log).

That error occurs when the data read back in is not equal to the data that 
was written out.

> Anyone know what the problem might be or where to start digging?

You can add more debugging statements to the ctrl_out() routine in 
drivers/usb/misc/usbtest.c.  For instance, you could print out the data 
that was sent and the data that was received, so you can see how they 
differ.

Beyond that (this probably won't be very useful advice) the problem might
lie in the EZ-USB device, its firmware, your host controller, or the host
controller driver.  Start digging into whichever component you feel is
least reliable.

Alan Stern



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