linux-kernel - Re: [PATCH 2/2] USB: ehci: tegra: Align DMA transfers to 32 bytes

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Message-Id: <201012180017.41391.oliver@neukum.org>
Date:	Sat, 18 Dec 2010 00:17:40 +0100
From:	Oliver Neukum <oliver@...kum.org>
To:	Greg KH <gregkh@...e.de>
Cc:	rmorell@...dia.com,
	David Brownell <dbrownell@...rs.sourceforge.net>,
	Benoit Goby <benoit@...roid.com>,
	Alan Stern <stern@...land.harvard.edu>,
	Sarah Sharp <sarah.a.sharp@...ux.intel.com>,
	Matthew Wilcox <willy@...ux.intel.com>,
	Ming Lei <tom.leiming@...il.com>,
	Jacob Pan <jacob.jun.pan@...el.com>,
	Olof Johansson <olof@...om.net>,
	Erik Gilling <konkers@...roid.com>,
	Colin Cross <ccross@...roid.com>,
	"linux-usb@...r.kernel.org" <linux-usb@...r.kernel.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH 2/2] USB: ehci: tegra: Align DMA transfers to 32 bytes

Am Samstag, 18. Dezember 2010, 00:09:40 schrieb Greg KH:
> I still don't like it, it feels like a hack that is not going to be able
> to be maintained very well.
> 
> And I still think the individual drivers should be fixed...
> 

But they are not buggy. The USB API was written under the
assumption that HCDs can deal with byte level granularity and alignment.
Hence the network driver pass DMA-able memory with an alignment
that suits them.

	Regards
		Oliver
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