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Date:	Mon, 5 Jan 2015 16:51:51 +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 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) {

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
> 

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