linux-kernel - [PATCH 2/29] video: mxsfb: simplify use of devm_ioremap

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Date:	Wed, 14 Aug 2013 11:11:06 +0200
From:	Julia Lawall <Julia.Lawall@...6.fr>
To:	Jean-Christophe Plagniol-Villard <plagnioj@...osoft.com>
Cc:	kernel-janitors@...r.kernel.org,
	Tomi Valkeinen <tomi.valkeinen@...com>,
	linux-fbdev@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: [PATCH 2/29] video: mxsfb: 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/video/mxsfb.c |    7 +------
 1 file changed, 1 insertion(+), 6 deletions(-)

diff --git a/drivers/video/mxsfb.c b/drivers/video/mxsfb.c
index c2d3514..d250ed0 100644
--- a/drivers/video/mxsfb.c
+++ b/drivers/video/mxsfb.c
@@ -855,12 +855,6 @@ static int mxsfb_probe(struct platform_device *pdev)
 	if (of_id)
 		pdev->id_entry = of_id->data;
 
-	res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
-	if (!res) {
-		dev_err(&pdev->dev, "Cannot get memory IO resource\n");
-		return -ENODEV;
-	}
-
 	fb_info = framebuffer_alloc(sizeof(struct mxsfb_info), &pdev->dev);
 	if (!fb_info) {
 		dev_err(&pdev->dev, "Failed to allocate fbdev\n");
@@ -869,6 +863,7 @@ static int mxsfb_probe(struct platform_device *pdev)
 
 	host = to_imxfb_host(fb_info);
 
+	res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
 	host->base = devm_ioremap_resource(&pdev->dev, res);
 	if (IS_ERR(host->base)) {
 		ret = PTR_ERR(host->base);

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