linux-kernel - [PATCH 1/2] dmaengine: ioat: set error code on failures

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Date:   Fri,  2 Dec 2016 22:49:01 +0800
From:   Pan Bian <bianpan2016@....com>
To:     Vinod Koul <vinod.koul@...el.com>,
        Dan Williams <dan.j.williams@...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 1/2] dmaengine: ioat: set error code on failures

In function ioat_dma_self_test(), when the calls to dma_mapping_error() 
fails, the value of return variable err is 0 (indicates no error). As a 
result, the return value may be inconsistent with the execution status. 
This patch fixes the bug by assigning -ENOMEM to err on the error path.

Bugzilla: https://bugzilla.kernel.org/show_bug.cgi?id=188591

Signed-off-by: Pan Bian <bianpan2016@....com>
---
 drivers/dma/ioat/init.c | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/drivers/dma/ioat/init.c b/drivers/dma/ioat/init.c
index 015f711..32383ef 100644
--- a/drivers/dma/ioat/init.c
+++ b/drivers/dma/ioat/init.c
@@ -340,11 +340,13 @@ static int ioat_dma_self_test(struct ioatdma_device *ioat_dma)
 	dma_src = dma_map_single(dev, src, IOAT_TEST_SIZE, DMA_TO_DEVICE);
 	if (dma_mapping_error(dev, dma_src)) {
 		dev_err(dev, "mapping src buffer failed\n");
+		err = -ENOMEM;
 		goto free_resources;
 	}
 	dma_dest = dma_map_single(dev, dest, IOAT_TEST_SIZE, DMA_FROM_DEVICE);
 	if (dma_mapping_error(dev, dma_dest)) {
 		dev_err(dev, "mapping dest buffer failed\n");
+		err = -ENOMEM;
 		goto unmap_src;
 	}
 	flags = DMA_PREP_INTERRUPT;
-- 
1.9.1