Re: [PATCH] fix __mod_timer vs __run_timers deadlock.

David S. Miller
2005-05-03T23:51:03Z

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.