Date: Tue, 3 May 2005 16:39:16 -0700
From: "David S. Miller" <davem@davemloft.net>
To: Benjamin Herrenschmidt <benh@kernel.crashing.org>
Cc: paulus@samba.org, jk@blackdown.de, akpm@osdl.org, oleg@tv-sign.ru,
       linux-kernel@vger.kernel.org, maneesh@in.ibm.com
Subject: Re: [PATCH] fix __mod_timer vs __run_timers deadlock.
Message-Id: <20050503163916.30d64630.davem@davemloft.net>
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On Wed, 04 May 2005 09:44:53 +1000
Benjamin Herrenschmidt <benh@kernel.crashing.org> wrote:

> Nothing prevents it ? well, I wouldn't be that optimistic :) The USB
> stuff is a bit complex, it inlcudes doing DMAs, so manipulating the
> iommu, dealing with URB queues (and thus allocating/releasing them)
> etc... and especially in the context of xmon, that mean letting the
> driver do a lot of these at any time whatever state the system is...

I think doing calls to the USB interrupt handler would work.
I'm not being crazy :)

But yeah we could do a micro-stack as well, but as you noted the
transfer to/from the real USB HCI driver would be non-trivial.

I truly believe just calling the real USB HCI driver interrupt
handler in a polling fashion is the way to go.
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