From: Greg KH <greg@kroah.com>
To: Daniel Bonekeeper <thehazard@gmail.com>
Cc: Alon Bar-Lev <alon.barlev@gmail.com>,
kernelnewbies@nl.linux.org, linux-kernel@vger.kernel.org
Subject: Re: Driver for Microsoft USB Fingerprint Reader
Date: Mon, 3 Jul 2006 20:58:22 -0700 [thread overview]
Message-ID: <20060704035822.GA18865@kroah.com> (raw)
In-Reply-To: <e1e1d5f40607032056x700c0333rf39fb43c8d73d117@mail.gmail.com>
On Mon, Jul 03, 2006 at 11:56:26PM -0400, Daniel Bonekeeper wrote:
> Maybe this is not a default on the market and is something that is
> coming... but seems that some USB controllers are coming with DMA
> capabilities:
>
> http://www.usb.org/developers/presentations/pres0501/Augustin_DMA_Implem_Final.ppt
> http://www.semiconductors.philips.com/pip/isp1183.html
I think you are a bit confused. Of course the USB Host controller
devices support DMA, that's how things are set up and work properly
without using a ton of CPU. They are usually PCI devices and work quite
well and use DMA.
It's the USB devices themselves that don't and can't do any DMA
themselves.
Hope this helps explain things.
greg k-h
next prev parent reply other threads:[~2006-07-04 4:01 UTC|newest]
Thread overview: 38+ messages / expand[flat|nested] mbox.gz Atom feed top
2006-07-03 6:51 Driver for Microsoft USB Fingerprint Reader Daniel Bonekeeper
2006-07-03 8:52 ` Daniel Drake
2006-07-03 10:04 ` Alon Bar-Lev
2006-07-03 17:37 ` [OT] " Alistair John Strachan
2006-07-03 20:16 ` Jan Engelhardt
2006-07-03 18:04 ` Daniel Bonekeeper
2006-07-03 18:16 ` Alon Bar-Lev
2006-07-03 20:53 ` Daniel Bonekeeper
2006-07-03 21:45 ` Greg KH
2006-07-03 22:11 ` Daniel Bonekeeper
2006-07-03 22:26 ` Greg KH
2006-07-03 23:24 ` Daniel Bonekeeper
2006-07-03 23:29 ` Greg KH
2006-07-04 0:04 ` Daniel Bonekeeper
2006-07-04 0:13 ` Greg KH
2006-07-05 17:58 ` Daniel Drake
2006-07-05 18:09 ` Daniel Bonekeeper
2006-07-05 18:55 ` Daniel Drake
2006-07-05 19:46 ` Daniel Bonekeeper
2006-07-05 23:23 ` Daniel Drake
2006-07-06 2:05 ` Daniel Bonekeeper
2006-07-06 10:35 ` Daniel Drake
2006-07-04 3:56 ` Daniel Bonekeeper
2006-07-04 3:58 ` Greg KH [this message]
2006-07-03 22:35 ` Alan Cox
2006-07-03 22:49 ` Daniel Bonekeeper
2006-07-04 8:39 ` Alan Cox
2006-07-05 4:01 ` Bill Davidsen
2006-07-05 15:55 ` Daniel Bonekeeper
2006-07-03 11:44 ` Alon Bar-Lev
2006-07-03 15:00 ` Valdis.Kletnieks
2006-07-03 17:09 ` Alon Bar-Lev
-- strict thread matches above, loose matches on Subject: below --
2006-07-05 16:32 Daniel Bonekeeper
2006-07-06 4:48 linux
2006-07-06 12:26 ` Daniel Drake
2006-07-06 17:38 ` Alan Cox
2006-07-06 17:49 ` Joel Jaeggli
[not found] <6vtYr-w2-5@gated-at.bofh.it>
[not found] ` <6vFQ5-1iV-71@gated-at.bofh.it>
2006-07-06 21:39 ` Bodo Eggert
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