linux-kernel - Re: [PATCH] dma: fix vchan_cookie

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Message-ID: <20140120120301.GE26823@intel.com>
Date:	Mon, 20 Jan 2014 17:33:01 +0530
From:	Vinod Koul <vinod.koul@...el.com>
To:	Russell King - ARM Linux <linux@....linux.org.uk>
Cc:	Jonas Jensen <jonas.jensen@...il.com>,
	linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org,
	arm@...nel.org, dan.j.williams@...el.com
Subject: Re: [PATCH] dma: fix vchan_cookie_complete() debug print

On Mon, Jan 20, 2014 at 11:28:22AM +0000, Russell King - ARM Linux wrote:
> On Mon, Jan 20, 2014 at 03:29:17PM +0530, Vinod Koul wrote:
> > On Fri, Dec 06, 2013 at 04:42:09PM +0100, Jonas Jensen wrote:
> > > vd->tx.cookie is set zero on dma_cookie_complete(),
> > > save to local before printing it.
> > > 
> > > Signed-off-by: Jonas Jensen <jonas.jensen@...il.com>
> > > ---
> > > 
> > > Notes:
> > >     dev_vdbg() could also be moved to happen earlier, what do you prefer?
> > This would be preferred IMHO. Also pls cc dmaengine@...r on this
> 
> I prefer this version - it means that the verbose debug printk doesn't
> impact the completion timing when printk is expensive (eg, because its
> outputting via a serial port.)
But if you know your printk is costly, do you want to enable these?

-- 
~Vinod
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