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

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Date:	Sun, 28 Dec 2014 05:37:27 -0500
From:	Nicholas Mc Guire <der.herr@...r.at>
To:	Vinod Koul <vinod.koul@...el.com>
Cc:	Dan Williams <dan.j.williams@...el.com>,
	Prarit Bhargava <prarit@...hat.com>,
	Josh Triplett <josh@...htriplett.org>,
	Rashika <rashika.kheria@...il.com>,
	Dave Jiang <dave.jiang@...el.com>, dmaengine@...r.kernel.org,
	linux-kernel@...r.kernel.org, Nicholas Mc Guire <der.herr@...r.at>
Subject: [PATCH] ioat: fail self-test if wait_for_completion times out

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) {
 		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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