linux-kernel - Re: USB mass storage and ARM cache coherency

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Date:	Tue, 2 Feb 2010 15:52:19 +0100
From:	Oliver Neukum <oliver@...kum.org>
To:	Clemens Ladisch <clemens@...isch.de>
Cc:	Andreas Mohr <andi@...as.de>,
	Catalin Marinas <catalin.marinas@....com>,
	Matthew Dharm <mdharm-kernel@...-eyed-alien.net>,
	Sergei Shtylyov <sshtylyov@...mvista.com>,
	Ming Lei <tom.leiming@...il.com>, linux-usb@...r.kernel.org,
	"linux-kernel" <linux-kernel@...r.kernel.org>,
	Sebastian Siewior <bigeasy@...utronix.de>,
	Greg KH <greg@...ah.com>
Subject: Re: USB mass storage and ARM cache coherency

Am Dienstag, 2. Februar 2010 15:42:49 schrieb Clemens Ladisch:
> > Or... usb-audio? I should have verified that it is using bulk endpoints
> > (and thus the patch applies to my case).
> > usb-audio probably uses isochronous transfers, thus that would be
> > an obvious reason why the patch didn't work for me.
> 
> snd-usb-audio indeed uses isochronous transfers, but those buffers are
> never mapped into user space.  The intermediate vmalloc()ed buffer is,
> however, and there was a bugfix for this recently.  Do you have these
> patches in your tree?

Now that I think about it, several video drivers do map it to user space.

	Regards
		Oliver
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