linux-kernel - Re: [PATCH] ioat: fail self-test if wait_for

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Date:	Tue, 6 Jan 2015 15:38:02 +0000
From:	"Jiang, Dave" <dave.jiang@...el.com>
To:	"der.herr@...r.at" <der.herr@...r.at>
CC:	"Williams, Dan J" <dan.j.williams@...el.com>,
	"dmaengine@...r.kernel.org" <dmaengine@...r.kernel.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"rashika.kheria@...il.com" <rashika.kheria@...il.com>,
	"Koul, Vinod" <vinod.koul@...el.com>,
	"prarit@...hat.com" <prarit@...hat.com>,
	"josh@...htriplett.org" <josh@...htriplett.org>
Subject: Re: [PATCH] ioat: fail self-test if wait_for_completion times out




On Tue, 2015-01-06 at 00:42 +0000, Nicholas Mc Guire wrote:
> On Mon, 05 Jan 2015, Jiang, Dave wrote:
> 
> > 
> > 
> > 
> > On Sun, 2014-12-28 at 10:37 +0000, Nicholas Mc Guire wrote:
> > > wait_for_completion_timeout reaching timeout was being ignored,
> > > fail the self-test if timeout condition occurs.
> > > 
> > > Not sure about the indentations used (CodingStyle:Chapter 2)
> > > 
> > > this was only compile tested with
> > > x86_64_defconfig + CONFIG_DMA_ENGINE=y + CONFIG_INTEL_IOATDMA=y
> > > 
> > > patch is against linux-next 3.19.0-rc1 -next-20141226
> > > 
> > > Signed-off-by: Nicholas Mc Guire <der.herr@...r.at>
> > > ---
> > >  drivers/dma/ioat/dma_v3.c |    9 ++++++---
> > >  1 file changed, 6 insertions(+), 3 deletions(-)
> > > 
> > > diff --git a/drivers/dma/ioat/dma_v3.c b/drivers/dma/ioat/dma_v3.c
> > > index be307182..0659215 100644
> > > --- a/drivers/dma/ioat/dma_v3.c
> > > +++ b/drivers/dma/ioat/dma_v3.c
> > > @@ -1311,7 +1311,8 @@ static int ioat_xor_val_self_test(struct ioatdma_device *device)
> > > 
> > >  	tmo = wait_for_completion_timeout(&cmp, msecs_to_jiffies(3000));
> > > 
> > > -	if (dma->device_tx_status(dma_chan, cookie, NULL) != DMA_COMPLETE) {
> > > +	if (tmo == 0 || dma->device_tx_status(dma_chan, cookie, NULL)
> > > +			!= DMA_COMPLETE) {
> > >  		dev_err(dev, "Self-test xor timed out\n");
> > >  		err = -ENODEV;
> > >  		goto dma_unmap;
> > > @@ -1377,7 +1378,8 @@ static int ioat_xor_val_self_test(struct ioatdma_device *device)
> > > 
> > >  	tmo = wait_for_completion_timeout(&cmp, msecs_to_jiffies(3000));
> > > 
> > > -	if (dma->device_tx_status(dma_chan, cookie, NULL) != DMA_COMPLETE) {
> > > +	if (tmo == 0 || dma->device_tx_status(dma_chan, cookie, NULL)
> > > +			!= DMA_COMPLETE) {
> > 
> > Can you please do: 
> > +	if (tmo == 0 ||
> > +	    dma->device_tx_status(dma_chan, cookie, NULL) != DMA_COMPLETE) {
> 
> Documentation/CodingStyle:Chapter 2
> 
> "Statements longer than 80 columns will be broken into sensible chunks, unless
> exceeding 80 columns significantly increases readability and does not hide
> information. Descendants are always substantially shorter than the parent and
> are placed substantially to the right. The same applies to function headers..."
> 
> am I misreading the CodingStyle here ?

I'm not sure what the issue is here.... What I proposed is still the
same length as the original code. And what I suggested complies with the
existing coding style that's already there.

> 
> > 
> > Otherwise it looks good. Although I've never hit that error condition either. 
> > 
> > >  		dev_err(dev, "Self-test validate timed out\n");
> > >  		err = -ENODEV;
> > >  		goto dma_unmap;
> > > @@ -1429,7 +1431,8 @@ static int ioat_xor_val_self_test(struct ioatdma_device *device)
> > > 
> > >  	tmo = wait_for_completion_timeout(&cmp, msecs_to_jiffies(3000));
> > > 
> > > -	if (dma->device_tx_status(dma_chan, cookie, NULL) != DMA_COMPLETE) {
> > > +	if (tmo == 0 || dma->device_tx_status(dma_chan, cookie, NULL)
> > > +			!= DMA_COMPLETE) {
> > >  		dev_err(dev, "Self-test 2nd validate timed out\n");
> > >  		err = -ENODEV;
> > >  		goto dma_unmap;
> > > --
> > > 1.7.10.4
> > > 
> 
> thx!
> hofrat
> --
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