linux-kernel - RE: [PATCH]iwlan dma mapping read and write changes

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Date:	Wed, 11 Feb 2009 22:50:07 +0100
From:	Johannes Berg <johannes@...solutions.net>
To:	"Winkler, Tomas" <tomas.winkler@...el.com>
Cc:	"Yu, Fenghua" <fenghua.yu@...el.com>,
	David Woodhouse <dwmw2@...radead.org>,
	Ingo Molnar <mingo@...e.hu>,
	Stephen Rothwell <sfr@...b.auug.org.au>,
	"Grumbach, Emmanuel" <emmanuel.grumbach@...el.com>,
	"Zhu, Yi" <yi.zhu@...el.com>, Chris Wright <chrisw@...s-sol.org>,
	LKML <linux-kernel@...r.kernel.org>,
	"iommu@...ts.linux-foundation.org" <iommu@...ts.linux-foundation.org>
Subject: RE: [PATCH]iwlan dma mapping read and write changes

On Wed, 2009-02-11 at 22:47 +0100, Johannes Berg wrote:
> > >> Indeed the firmware/ucode write back to host memory to update retry
> > >> counter for APMDU packets. I'm not sure if this is needed for legacy
> > >> traffic, though.
> > >
> > >I don't think they can be seeing AMPDU packets since that is, well,
> > >broken?
> > 
> > Currently I'm not aware of any other cases where memory is accessed
> > back but I may have not complete info.  Will be back with the answer
> > tomorrow.
> 
> I don't think it really matters, since AMPDU packets will be fixed soon,
> and for those you know it's necessary (and the report says that under
> some other circumstances it's also necessary). Unless there'd be some
> benefit from using BIDI only when we know it'll be needed, and using
> TODEV in the other cases?

Or if there's a firmware bug.

johannes

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