linux-kernel - [PATCH v2] dmaengine: sun6i: use of_device_get_match

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Date:   Wed, 20 Sep 2017 09:24:02 +0200
From:   Corentin Labbe <clabbe.montjoie@...il.com>
To:     vinod.koul@...el.com, dan.j.williams@...el.com,
        maxime.ripard@...e-electrons.com, wens@...e.org
Cc:     dmaengine@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
        linux-kernel@...r.kernel.org,
        Corentin Labbe <clabbe.montjoie@...il.com>
Subject: [PATCH v2] dmaengine: sun6i: use of_device_get_match_data

The usage of of_device_get_match_data reduce the code size a bit.
Furthermore, it prevents an improbable dereference when
of_match_device() return NULL.

Acked-by: Maxime Ripard <maxime.ripard@...e-electrons.com>
Signed-off-by: Corentin Labbe <clabbe.montjoie@...il.com>
---
Changes since v1:
- fixed commit title
 drivers/dma/sun6i-dma.c | 6 ++----
 1 file changed, 2 insertions(+), 4 deletions(-)

diff --git a/drivers/dma/sun6i-dma.c b/drivers/dma/sun6i-dma.c
index bcd496edc70f..584f4e82a9be 100644
--- a/drivers/dma/sun6i-dma.c
+++ b/drivers/dma/sun6i-dma.c
@@ -1064,7 +1064,6 @@ MODULE_DEVICE_TABLE(of, sun6i_dma_match);
 
 static int sun6i_dma_probe(struct platform_device *pdev)
 {
-	const struct of_device_id *device;
 	struct sun6i_dma_dev *sdc;
 	struct resource *res;
 	int ret, i;
@@ -1073,10 +1072,9 @@ static int sun6i_dma_probe(struct platform_device *pdev)
 	if (!sdc)
 		return -ENOMEM;
 
-	device = of_match_device(sun6i_dma_match, &pdev->dev);
-	if (!device)
+	sdc->cfg = of_device_get_match_data(&pdev->dev);
+	if (!sdc->cfg)
 		return -ENODEV;
-	sdc->cfg = device->data;
 
 	res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
 	sdc->base = devm_ioremap_resource(&pdev->dev, res);
-- 
2.13.5