linux-kernel - Re: [alsa-devel] USB transfer_buffer allocations on 64bit systems

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Message-ID: <20100511150557.GY30801@buzzloop.caiaq.de>
Date:	Tue, 11 May 2010 17:05:57 +0200
From:	Daniel Mack <daniel@...aq.de>
To:	Alan Stern <stern@...land.harvard.edu>
Cc:	Konrad Rzeszutek Wilk <konrad.wilk@...cle.com>,
	FUJITA Tomonori <fujita.tomonori@....ntt.co.jp>,
	USB list <linux-usb@...r.kernel.org>, tiwai@...e.de,
	gregkh@...e.de, clemens@...isch.de,
	Kernel development list <linux-kernel@...r.kernel.org>,
	chrisw@...s-sol.org, iommu@...ts.linux-foundation.org,
	andi@...stfloor.org, pedrib@...il.com,
	Andrew Morton <akpm@...ux-foundation.org>, dwmw2@...radead.org
Subject: Re: [alsa-devel] USB transfer_buffer allocations on 64bit systems

On Tue, May 11, 2010 at 10:57:07AM -0400, Alan Stern wrote:
> There are no calls to any dma_sync_* routines.  Daniel will have to
> check me on this, but I believe that urb->transfer_buffer is filled
> before dma_map_single() is called and it isn't touched again until
> after dma_unmap_single() (which occurs before urb's completion handler
> is called).

Yes, that's correct. Sorry fot the misleading information I gave. The
code doesn't to any weird tricks as it currently stands. It fills the
buffer, submits the URB and doesn't touch the buffer contents
afterwards.

Daniel

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