On Sun, Apr 29, 2001 at 06:27:53PM +0200, Sancho Dauskardt wrote:
> Once again the turn-time issue, which is really serious for the usb-storage
> device i'm fighting with, since it can only do max 4k transfers (again this
> EZ-USB thing that doesn't enumerate and therfore doesn't change the
> interfaces).
>
> Trying to optimize following sequence:
> - send command to bulk ep 4. I call this the 'master-urb'
> - recieve data from bulk ep 2. I call this the 'slave-urb'
Is there a reason you can't submit the read urb to ep 2 before sending
the command to ep 4? Or, how about having the completion handler for ep
4 submit the read urb to ep 2? Then you _know_ the write command
completed before trying to read (you can't rely on the status !=
EINPROGRESS as I've been reminded at times :)
Hope this helps,
greg k-h
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