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

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Date:	Thu, 4 Mar 2010 23:27:08 +0100
From:	Andreas Mohr <andi@...as.de>
To:	Russell King - ARM Linux <linux@....linux.org.uk>
Cc:	Paul Mundt <lethal@...ux-sh.org>,
	Catalin Marinas <catalin.marinas@....com>,
	FUJITA Tomonori <fujita.tomonori@....ntt.co.jp>,
	mdharm-kernel@...-eyed-alien.net, oliver@...kum.org,
	greg@...ah.com, x0082077@...com, sshtylyov@...mvista.com,
	benh@...nel.crashing.org, bigeasy@...utronix.de,
	linux-kernel@...r.kernel.org
Subject: Re: USB mass storage and ARM cache coherency

> Here is a program which Lothar sent me some time ago (the timestamp on
> the .c is June 2004 - I can't find the original email though.)  I've
> just checked with Lothar, who has given me permission to reproduce it.
> 
> I can't guarantee that this program still shows a problem - since I
> believe I've never been able to reproduce it myself.  It might be worth
> checking how other architectures behave.

Tried this on my BCM4710 MIPSEL 2.6.31.9 OpenWrt/Debian (problematic
cache-suspected history due to possibly related USB-audio lockups),
/dev/sda3 ext2 on an USB stick, no errors here, even when increasing tenfold
to 2560 and adding a sleep(2) in between.

Will investigate these things for real sometime later.

Andreas Mohr

P.S.: KARO (Lothar...) makes very nice boards :-)
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