linux-kernel - Re: [4.0-rc+] WARNING: CPU: 0 PID: 1 at ./drivers/dma/dmaengine.c:863 dma_async_device

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Date:	Thu, 9 Apr 2015 09:07:12 +0200
From:	Maxime Ripard <maxime.ripard@...e-electrons.com>
To:	Peter Hurley <peter@...leysoftware.com>
Cc:	Linus Torvalds <torvalds@...ux-foundation.org>,
	Vinod Koul <vinod.koul@...el.com>, Felipe Balbi <balbi@...com>,
	Laurent Pinchart <laurent.pinchart@...asonboard.com>,
	Linux kernel <linux-kernel@...r.kernel.org>
Subject: Re: [4.0-rc+] WARNING: CPU: 0 PID: 1 at
 ./drivers/dma/dmaengine.c:863 dma_async_device_register+0xe0/0x540()

On Wed, Apr 08, 2015 at 12:26:13PM -0400, Peter Hurley wrote:
> Linus,
> 
> I just got an automated bounce reply from Vinod Koul stating
> he's on vacation til April 12th, so I'd appreciate if you could
> revert this commit [1] for 4.0-final.
> 
> The commit generates a WARNING [2] in a effort to get dmaengine drivers
> to add new functionality.
> 
> I sent Vinod a note that this was happening on Beaglebone Blacks
> back on Mar 5 (-rc3). He thought the functionality would be added
> shortly, but it wasn't, so the WARNING is still happening on -rc7.

For completeness, note that this is just a warning generated at
boot. It doesn't change the previous behaviour in any way.

Any existing code will work just as well as it used to.

Maxime

-- 
Maxime Ripard, Free Electrons
Embedded Linux, Kernel and Android engineering
http://free-electrons.com

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