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In-Reply-To: <zarafa.50812101.2485.7602d3ef42faff0a@eric2.bitfrost>
References: <zarafa.50812101.2485.7602d3ef42faff0a@eric2.bitfrost>
Date: Fri, 19 Oct 2012 20:07:45 +0200
Message-ID: <CA+ervzZ4w_PK3cVZd8YHXJX-JdjDhBOQsmBMeL+jndOohrO0nw@mail.gmail.com>
Subject: Re: USB transfers stuck in kernel/libusb not sent out until next
 transfer is submitted
From: Peer Stritzinger <peerst@gmail.com>
To: Hans Petter Selasky <hans.petter.selasky@bitfrost.no>
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Hi,

further data:

If I wait 2ms between each transfer they never get stuck.

As you mentioned in your other post, no usbdump yet in 8.0

But I can positively say that:

1. the transfer got submitted and the submit returned 0

2. no device NAK's on the USB bus (I'm looking at it with a sniffer)

So its definitely getting held in libusb/kernel

-- Peer

On Fri, Oct 19, 2012 at 11:44 AM, Hans Petter Selasky
<hans.petter.selasky@bitfrost.no> wrote:
> Hi,
>
>
>
> You should check using usbdump if the USB transfer is actually submitted. If
> it is submitted, then it is most likely a problem with the USB device, that
> it is NAK'ing on the endpoint. Are you short terminating properly for FULL
> speed? Else it is a problem in libusb and/or the application.
>
>
>
> usbdump -i usbusX -f Y -vvv -s 65536
>
>
>
> --HPS
>
>