linux-kernel - [PATCH 2/2] dma: ioat: fix improper return value on failures

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Message-Id: <1480577529-30981-1-git-send-email-bianpan2016@163.com>
Date:   Thu,  1 Dec 2016 15:32:09 +0800
From:   Pan Bian <bianpan2016@....com>
To:     Dan Williams <dan.j.williams@...el.com>,
        Vinod Koul <vinod.koul@...el.com>,
        Dave Jiang <dave.jiang@...el.com>,
        Julia Lawall <Julia.Lawall@...6.fr>
Cc:     dmaengine@...r.kernel.org, linux-kernel@...r.kernel.org,
        Pan Bian <bianpan2016@....com>
Subject: [PATCH 2/2] dma: ioat: fix improper return value on failures

Fix bug https://bugzilla.kernel.org/show_bug.cgi?id=188601. This patch
is based on "0001-dma-ioat-set-error-code-on-failures.patch". In this
patch, assign error code -ENOMEM to return variable err as long as the
call to dma_mapping_error() fails.

Signed-off-by: Pan Bian <bianpan2016@....com>
---
 drivers/dma/ioat/init.c | 16 ++++++++++++----
 1 file changed, 12 insertions(+), 4 deletions(-)

diff --git a/drivers/dma/ioat/init.c b/drivers/dma/ioat/init.c
index 32383ef..3d589f4 100644
--- a/drivers/dma/ioat/init.c
+++ b/drivers/dma/ioat/init.c
@@ -829,16 +829,20 @@ static int ioat_xor_val_self_test(struct ioatdma_device *ioat_dma)
 	op = IOAT_OP_XOR;
 
 	dest_dma = dma_map_page(dev, dest, 0, PAGE_SIZE, DMA_FROM_DEVICE);
-	if (dma_mapping_error(dev, dest_dma))
+	if (dma_mapping_error(dev, dest_dma)) {
+		err = -ENOMEM;
 		goto free_resources;
+	}
 
 	for (i = 0; i < IOAT_NUM_SRC_TEST; i++)
 		dma_srcs[i] = DMA_ERROR_CODE;
 	for (i = 0; i < IOAT_NUM_SRC_TEST; i++) {
 		dma_srcs[i] = dma_map_page(dev, xor_srcs[i], 0, PAGE_SIZE,
 					   DMA_TO_DEVICE);
-		if (dma_mapping_error(dev, dma_srcs[i]))
+		if (dma_mapping_error(dev, dma_srcs[i])) {
+			err = -ENOMEM;
 			goto dma_unmap;
+		}
 	}
 	tx = dma->device_prep_dma_xor(dma_chan, dest_dma, dma_srcs,
 				      IOAT_NUM_SRC_TEST, PAGE_SIZE,
@@ -906,8 +910,10 @@ static int ioat_xor_val_self_test(struct ioatdma_device *ioat_dma)
 	for (i = 0; i < IOAT_NUM_SRC_TEST + 1; i++) {
 		dma_srcs[i] = dma_map_page(dev, xor_val_srcs[i], 0, PAGE_SIZE,
 					   DMA_TO_DEVICE);
-		if (dma_mapping_error(dev, dma_srcs[i]))
+		if (dma_mapping_error(dev, dma_srcs[i])) {
+			err = -ENOMEM;
 			goto dma_unmap;
+		}
 	}
 	tx = dma->device_prep_dma_xor_val(dma_chan, dma_srcs,
 					  IOAT_NUM_SRC_TEST + 1, PAGE_SIZE,
@@ -959,8 +965,10 @@ static int ioat_xor_val_self_test(struct ioatdma_device *ioat_dma)
 	for (i = 0; i < IOAT_NUM_SRC_TEST + 1; i++) {
 		dma_srcs[i] = dma_map_page(dev, xor_val_srcs[i], 0, PAGE_SIZE,
 					   DMA_TO_DEVICE);
-		if (dma_mapping_error(dev, dma_srcs[i]))
+		if (dma_mapping_error(dev, dma_srcs[i])) {
+			err = -ENOMEM;
 			goto dma_unmap;
+		}
 	}
 	tx = dma->device_prep_dma_xor_val(dma_chan, dma_srcs,
 					  IOAT_NUM_SRC_TEST + 1, PAGE_SIZE,
-- 
1.9.1