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

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Date:	Tue, 02 Feb 2010 14:35:48 +0000
From:	Catalin Marinas <catalin.marinas@....com>
To:	Ming Lei <tom.leiming@...il.com>
Cc:	Oliver Neukum <oliver@...kum.org>,
	Matthew Dharm <mdharm-kernel@...-eyed-alien.net>,
	Sergei Shtylyov <sshtylyov@...mvista.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

On Tue, 2010-02-02 at 13:36 +0000, Ming Lei wrote:
> 2010/2/2 Catalin Marinas <catalin.marinas@....com>:
> 
> > In the iSCSI case, does the HCD driver write directly to a page cache
> > page? Or it just fills in network packets that are copied to page cache
> > pages by the iSCSI code (sorry, I'm not familiar with this part of the
> > kernel). If the latter, the cache flushing in the HCD driver would not
> > help and it needs to be done in the iSCSI code.
> 
> So we should flush dcache page in the place where the user mapped
> page is copied to, instead of low level driver which does not do such
> thing always.

Or both if you can't be sure whether the driver copies directly to a
page cache page.

-- 
Catalin

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