linux-kernel - [PATCH 4/29] mtd: simplify use of devm_ioremap

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Date:	Wed, 14 Aug 2013 11:11:08 +0200
From:	Julia Lawall <Julia.Lawall@...6.fr>
To:	David Woodhouse <dwmw2@...radead.org>
Cc:	kernel-janitors@...r.kernel.org, linux-mtd@...ts.infradead.org,
	linux-kernel@...r.kernel.org
Subject: [PATCH 4/29] mtd: 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.

Move the call to platform_get_resource adjacent to the call to
devm_ioremap_resource to make the connection between them more clear.

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/mtd/devices/elm.c    |    5 -----
 drivers/mtd/nand/txx9ndfmc.c |    4 +---
 2 files changed, 1 insertion(+), 8 deletions(-)

diff --git a/drivers/mtd/devices/elm.c b/drivers/mtd/devices/elm.c
index 4f683d2..d1dd6a3 100644
--- a/drivers/mtd/devices/elm.c
+++ b/drivers/mtd/devices/elm.c
@@ -368,11 +368,6 @@ static int elm_probe(struct platform_device *pdev)
 	}
 
 	res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
-	if (!res) {
-		dev_err(&pdev->dev, "no memory resource defined\n");
-		return -ENODEV;
-	}
-
 	info->elm_base = devm_ioremap_resource(&pdev->dev, res);
 	if (IS_ERR(info->elm_base))
 		return PTR_ERR(info->elm_base);
diff --git a/drivers/mtd/nand/txx9ndfmc.c b/drivers/mtd/nand/txx9ndfmc.c
index 440b570..235714a 100644
--- a/drivers/mtd/nand/txx9ndfmc.c
+++ b/drivers/mtd/nand/txx9ndfmc.c
@@ -281,12 +281,10 @@ static int __init txx9ndfmc_probe(struct platform_device *dev)
 	unsigned long gbusclk = plat->gbus_clock;
 	struct resource *res;
 
-	res = platform_get_resource(dev, IORESOURCE_MEM, 0);
-	if (!res)
-		return -ENODEV;
 	drvdata = devm_kzalloc(&dev->dev, sizeof(*drvdata), GFP_KERNEL);
 	if (!drvdata)
 		return -ENOMEM;
+	res = platform_get_resource(dev, IORESOURCE_MEM, 0);
 	drvdata->base = devm_ioremap_resource(&dev->dev, res);
 	if (IS_ERR(drvdata->base))
 		return PTR_ERR(drvdata->base);

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