On Tue, 6 Jun 2006, usb usb wrote:
> I had some issues with resets, and thanks to Alan, I
> could get them fixed.
>
> I have another strange problem with my USB device
> (2.0) on 2.6.12 kernel.
>
> I have several USB data acquisition devices running
> with my driver. One of them (totally random) fails at
> urb_submit with -22 error. err -22 => Invalid transfer
> type/Invalid intrrupt interval/Invalid argument.
>
> It's a straight forward call urb_submit () call. I
> checked all and I'm not able to find the reason for
> this error. Would someone give me some pointers?
>
> Sorry, if I'm not clear - just coming back from a long
> vacation!
There are several possible reasons for getting a -EINVAL (= -22) error
code. Some of them are:
The URB is already in use;
urb->number_of_packets <= 0 for an isochronous URB;
Some bogus bits are set in urb->flags;
urb->interval <= 0 for an interrupt or isochronous URB;
urb->interval > 255 for a low-speed or full-speed interrupt URB;
urb->transfer_length < 0 for a non-isochronous URB;
A bulk transfer is submitted for a low-speed device.
There are other reasons as well. It wouldn't hurt to upgrade to 2.6.16
before doing more development.
Alan Stern
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