linux-kernel - [PATCH 11/29] marvell-ccic/mmp-driver.c: simplify use of devm_ioremap

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Date:	Wed, 14 Aug 2013 11:11:15 +0200
From:	Julia Lawall <Julia.Lawall@...6.fr>
To:	Jonathan Corbet <corbet@....net>
Cc:	kernel-janitors@...r.kernel.org,
	Mauro Carvalho Chehab <m.chehab@...sung.com>,
	linux-media@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: [PATCH 11/29] marvell-ccic/mmp-driver.c: simplify use of devm_ioremap_resource

From: Julia Lawall <Julia.Lawall@...6.fr>

Remove unneeded error handling on the result of a call to
platform_get_resource when the value is passed to devm_ioremap_resource.

A simplified version of the semantic patch that makes this change is as
follows: (http://coccinelle.lip6.fr/)

// <smpl>
@@
expression pdev,res,n,e,e1;
expression ret != 0;
identifier l;
@@

- res = platform_get_resource(pdev, IORESOURCE_MEM, n);
  ... when != res
- if (res == NULL) { ... \(goto l;\|return ret;\) }
  ... when != res
+ res = platform_get_resource(pdev, IORESOURCE_MEM, n);
  e = devm_ioremap_resource(e1, res);
// </smpl>

Signed-off-by: Julia Lawall <Julia.Lawall@...6.fr>

---
 drivers/media/platform/marvell-ccic/mmp-driver.c |    8 --------
 1 file changed, 8 deletions(-)

diff --git a/drivers/media/platform/marvell-ccic/mmp-driver.c b/drivers/media/platform/marvell-ccic/mmp-driver.c
index f06daa4..b5a19af 100644
--- a/drivers/media/platform/marvell-ccic/mmp-driver.c
+++ b/drivers/media/platform/marvell-ccic/mmp-driver.c
@@ -396,10 +396,6 @@ static int mmpcam_probe(struct platform_device *pdev)
 	 * Get our I/O memory.
 	 */
 	res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
-	if (res == NULL) {
-		dev_err(&pdev->dev, "no iomem resource!\n");
-		return -ENODEV;
-	}
 	mcam->regs = devm_ioremap_resource(&pdev->dev, res);
 	if (IS_ERR(mcam->regs))
 		return PTR_ERR(mcam->regs);
@@ -409,10 +405,6 @@ static int mmpcam_probe(struct platform_device *pdev)
 	 * should really be managed outside of this driver?
 	 */
 	res = platform_get_resource(pdev, IORESOURCE_MEM, 1);
-	if (res == NULL) {
-		dev_err(&pdev->dev, "no power resource!\n");
-		return -ENODEV;
-	}
 	cam->power_regs = devm_ioremap_resource(&pdev->dev, res);
 	if (IS_ERR(cam->power_regs))
 		return PTR_ERR(cam->power_regs);

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