On 04/07/13 09:04, Hans Petter Selasky wrote:

3) Make sure that channels are not generating tokens if they are aborted
/ cancelled / timedout. This can not be verified using a USB mass
storage device. Verify this by connecting a USB serial adapter. Try to
open/close /dev/cuaU0. Make sure it does not loose any bytes and that
channel cancel does not hang forever.


I recommend that cancel works like this:

1) Set invalid device address, like 127.

2) Use DMA delay feature to make a 4ms wait (see XHCI driver for example).

3) Free host channel (final).

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