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

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Date:	Mon, 08 Feb 2010 10:19:44 +0000
From:	Catalin Marinas <catalin.marinas@....com>
To:	Andreas Mohr <andi@...as.de>
Cc:	Pavel Machek <pavel@....cz>,
	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>,
	linux-arm-kernel <linux-arm-kernel@...ts.infradead.org>
Subject: Re: USB mass storage and ARM cache coherency

On Mon, 2010-02-08 at 07:33 +0000, Andreas Mohr wrote:
> On Mon, Feb 08, 2010 at 07:55:19AM +0100, Pavel Machek wrote:
> > Plus it does unneccessary flushes on x86, etc...
> 
> Noticed that as well, there should be an arch-obeying helper for this.
> 
> 
> On my MIPSEL, I had urb->transfer_buffer NULL ptr crashes
> (I think that was expected in case of a certain DMA setup, Alan said).
> 
> However, even with NULL check added I still had:
> 
> hub 2-1.1:1.0: state 7 ports 7 chg 0000 evt 0010
> Unhandled kernel unaligned access[#1]:

Just to avoid confusion - that's a similar patch applied to a different
driver. The ISP1760 HCD driver works fine with my patch (transfer_buffer
never seems to be NULL with latest mainline). I can't comment on the
ehci-q.c driver (it looks like it has some support for DMA while my
patch only applies to PIO drivers where transfer_buffer should be set).

-- 
Catalin

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