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Subject: Re: question on why hvc_console calls hvc_poll() in
	hvc_handle_interrupt().
From: Michael Ellerman <michael@ellerman.id.au>
To: Ryan Arnold <rsa@us.ibm.com>
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Date: Wed, 03 May 2006 17:42:43 +1000
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Cc: linuxppc-dev@ozlabs.org, cbe-oss-dev@ozlabs.org,
	Milton Miller <miltonm@bga.com>
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On Thu, 2006-04-20 at 15:25 -0500, Ryan Arnold wrote:
> While on the topic of hvc_console; I think I saw a patch go through a
> while ago that added hvc_poll() to hvc_handle_interrupt().  I can't say
> I'm too pleased with that addition.  I did my best to keep locking
> outside of the interrupt handler.
>=20
> I wonder if that change was tested on a power5 lpar system with several
> secondary VSerial Server adapters (hvc1-hvcn) being hammered with data.
> I'm pretty paranoid about deadlock, hence the reason for keeping locking
> out of the int. handler.

That was Milton's patch. No idea whether it's correct/tested.

cheers

--=20
Michael Ellerman
IBM OzLabs

wwweb: http://michael.ellerman.id.au
phone: +61 2 6212 1183 (tie line 70 21183)

We do not inherit the earth from our ancestors,
we borrow it from our children. - S.M.A.R.T Person

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