linux-kernel - [PATCH 7/29] dma: mmp: simplify use of devm_ioremap

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Date:	Wed, 14 Aug 2013 11:11:11 +0200
From:	Julia Lawall <Julia.Lawall@...6.fr>
To:	Vinod Koul <vinod.koul@...el.com>
Cc:	kernel-janitors@...r.kernel.org, Dan Williams <djbw@...com>,
	linux-kernel@...r.kernel.org
Subject: [PATCH 7/29] dma: mmp: 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/dma/mmp_pdma.c |    3 ---
 drivers/dma/mmp_tdma.c |    3 ---
 2 files changed, 6 deletions(-)

diff --git a/drivers/dma/mmp_pdma.c b/drivers/dma/mmp_pdma.c
index 9a32f2d..afa5a2e 100644
--- a/drivers/dma/mmp_pdma.c
+++ b/drivers/dma/mmp_pdma.c
@@ -786,9 +786,6 @@ static int mmp_pdma_probe(struct platform_device *op)
 	spin_lock_init(&pdev->phy_lock);
 
 	iores = platform_get_resource(op, IORESOURCE_MEM, 0);
-	if (!iores)
-		return -EINVAL;
-
 	pdev->base = devm_ioremap_resource(pdev->dev, iores);
 	if (IS_ERR(pdev->base))
 		return PTR_ERR(pdev->base);
diff --git a/drivers/dma/mmp_tdma.c b/drivers/dma/mmp_tdma.c
index a9345d0..38cb517 100644
--- a/drivers/dma/mmp_tdma.c
+++ b/drivers/dma/mmp_tdma.c
@@ -550,9 +550,6 @@ static int mmp_tdma_probe(struct platform_device *pdev)
 	}
 
 	iores = platform_get_resource(pdev, IORESOURCE_MEM, 0);
-	if (!iores)
-		return -EINVAL;
-
 	tdev->base = devm_ioremap_resource(&pdev->dev, iores);
 	if (IS_ERR(tdev->base))
 		return PTR_ERR(tdev->base);

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