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Re: e100 "Ferguson" release

To: David Brownell <david-b@xxxxxxxxxxx>
Subject: Re: e100 "Ferguson" release
From: "David S. Miller" <davem@xxxxxxxxxx>
Date: Sun, 3 Aug 2003 20:46:42 -0700
Cc: greearb@xxxxxxxxxxxxxxx, jgarzik@xxxxxxxxx, scott.feldman@xxxxxxxxx, netdev@xxxxxxxxxxx
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On Sun, 03 Aug 2003 20:45:01 -0700
David Brownell <david-b@xxxxxxxxxxx> wrote:

> What can't be pre-allocated in a reliable way is the resources
> used by the host controller drivers, specifically the transfer
> descriptors.  EHCI and OHCI usually need one per URB, unless
> MTU is over 4 KB.  UHCI normally needs quite a few.

Ok, that's interesting.

Is there a callback that tells the USB driver that some host
controller "resources" have become available?  I mean, these host
controllers either have to queue requests when out of resources or
provide a callback so that the drivers can resubmit.

Right?

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