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

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Message-Id: <201002180756.14100.oliver@neukum.org>
Date:	Thu, 18 Feb 2010 07:56:14 +0100
From:	Oliver Neukum <oliver@...kum.org>
To:	"Gadiyar, Anand" <gadiyar@...com>
Cc:	Alan Stern <stern@...land.harvard.edu>,
	"Shilimkar, Santosh" <santosh.shilimkar@...com>,
	"Russell King - ARM Linux" <linux@....linux.org.uk>,
	Catalin Marinas <catalin.marinas@....com>,
	Pavel Machek <pavel@....cz>, Greg KH <greg@...ah.com>,
	Matthew Dharm <mdharm-kernel@...-eyed-alien.net>,
	Sergei Shtylyov <sshtylyov@...mvista.com>,
	Ming Lei <tom.leiming@...il.com>,
	Sebastian Siewior <bigeasy@...utronix.de>,
	"linux-usb@...r.kernel.org" <linux-usb@...r.kernel.org>,
	"linux-kernel" <linux-kernel@...r.kernel.org>,
	"linux-arm-kernel" <linux-arm-kernel@...ts.infradead.org>,
	"Mankad, Maulik Ojas" <x0082077@...com>
Subject: Re: USB mass storage and ARM cache coherency

Am Mittwoch, 17. Februar 2010 21:30:24 schrieb Gadiyar, Anand:
> > Why do you skip mapping the setup packet but not the data packet?
> > 
> 
> I think that's oversight. For this controller, we need to skip mapping
> all buffers used to do transfers on EP0, which is all control transfers.

One thing more. Do you have an issue with EP 0 only or all control
endpoints? EP 0 must be control, but devices are within spec if they
have multiple control endpoints provided EP 0 is control.

	Regards
		Oliver
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