linux-kernel - Re: PROBLEM: ARM-dma-mapping-fix-for-speculative-prefetching cause OOPS

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Date:	Fri, 8 Jul 2011 09:07:51 +0100
From:	Russell King <rmk@....linux.org.uk>
To:	Qin Dehua <qindehua@...il.com>
Cc:	Dan Williams <dan.j.williams@...el.com>,
	linux-kernel@...r.kernel.org, santosh.shilimkar@...com,
	neilb@...e.de
Subject: Re: PROBLEM: ARM-dma-mapping-fix-for-speculative-prefetching cause
	OOPS

On Fri, Jul 08, 2011 at 12:38:38PM +0800, Qin Dehua wrote:
> After doing the above changes, the kernel just report  BUG_ON(dir ==
> DMA_BIDIRECTIONAL):

That's really unfortunate.

The only other thing I can think which may help is to enable all the
raid5, async_tx and dmaengine debug code.  And I hope you have
DMA_API_DEBUG enabled in your .config ?

-- 
Russell King
 Linux kernel    2.6 ARM Linux   - http://www.arm.linux.org.uk/
 maintainer of:
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