linux-kernel - Re: WARNING: at drivers/dma/dmaengine.c:352 dma_issue_pending

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Message-Id: <1232403532.22432.14.camel@dwillia2-linux.ch.intel.com>
Date:	Mon, 19 Jan 2009 15:18:52 -0700
From:	Dan Williams <dan.j.williams@...el.com>
To:	Ingo Molnar <mingo@...e.hu>
Cc:	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"Rafael J. Wysocki" <rjw@...k.pl>
Subject: Re: WARNING: at drivers/dma/dmaengine.c:352
	dma_issue_pending_all+0x77/0x15d()

On Mon, 2009-01-19 at 15:04 -0700, Dan Williams wrote:
> On Mon, 2009-01-19 at 14:31 -0700, Ingo Molnar wrote:
> > FYI, i'm getting this on a testbox, on v2.6.29-rc2:
> 
> Thanks for the report.  I assume this is with CONFIG_DMA_ENGINE=n?
> dma_issue_pending_all should be a nop in that case.  I'll apply the
> following with your confirmation.
> 

Spoke too soon, the call to dma_issue_pending_all is protected by ifdef
CONFIG_NET_DMA.  Reading that counter without synchronizing with
dma_list_mutex is a problem.  I think I'll just remove the warnings for
now.

--
Dan

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