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Message-ID: <Pine.LNX.4.44L0.1004121214460.1702-100000@iolanthe.rowland.org> Date: Mon, 12 Apr 2010 12:17:22 -0400 (EDT) From: Alan Stern <stern@...land.harvard.edu> To: Andi Kleen <andi@...stfloor.org> cc: Daniel Mack <daniel@...aq.de>, Pedro Ribeiro <pedrib@...il.com>, <linux-kernel@...r.kernel.org>, <akpm@...ux-foundation.org>, Greg KH <gregkh@...e.de>, <alsa-devel@...a-project.org>, <linux-usb@...r.kernel.org> Subject: Re: USB transfer_buffer allocations on 64bit systems On Mon, 12 Apr 2010, Andi Kleen wrote: > > Well, the sound driver itself doesn't care for any of those things, just > > like any other USB driver doesn't. The USB core itself of the host > > controller driver should do, and as far as I can see, it does that, yes. > > Hmm, still things must go wrong somewhere. Perhaps need some instrumentation > to see if all the transfer buffers really hit the PCI mapping functions. Such a test has already been carried out earlier in this thread: http://marc.info/?l=linux-usb&m=127074587029353&w=2 http://marc.info/?l=linux-usb&m=127076841801051&w=2 http://marc.info/?l=linux-usb&m=127082890510415&w=2 > It might be interesting to test if the device works with enabled > IOMMU. That would trigger any failures to properly map the buffers > earlier. Alan Stern -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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