linux-kernel - [PATCH] MIPS: Introduce the use of the managed version of kzalloc

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Date:	Wed, 7 May 2014 10:13:03 +0530
From:	Himangi Saraogi <himangi774@...il.com>
To:	ralf@...ux-mips.org, linux-mips@...ux-mips.org,
	linux-kernel@...r.kernel.org
Cc:	julia.lawall@...6.fr
Subject: [PATCH] MIPS: Introduce the use of the managed version of kzalloc

This patch moves data allocated using kzalloc to managed data allocated
using devm_kzalloc and cleans now unnecessary kfrees in probe and remove
functions.The labels out and out_mem are also removed as they are no
longer required.

The following Coccinelle semantic patch was used for making the change:

@platform@
identifier p, probefn, removefn;
@@
struct platform_driver p = {
  .probe = probefn,
  .remove = removefn,
};

@prb@
identifier platform.probefn, pdev;
expression e, e1, e2;
@@
probefn(struct platform_device *pdev, ...) {
  <+...
- e = kzalloc(e1, e2)
+ e = devm_kzalloc(&pdev->dev, e1, e2)
  ...
?-kfree(e);
  ...+>
}

@rem depends on prb@
identifier platform.removefn;
expression e;
@@
removefn(...) {
  <...
- kfree(e);
  ...>
}

Signed-off-by: Himangi Saraogi <himangi774@...il.com>
---
 arch/mips/mti-sead3/sead3-i2c-drv.c | 37 ++++++++++++++-----------------------
 1 file changed, 14 insertions(+), 23 deletions(-)

diff --git a/arch/mips/mti-sead3/sead3-i2c-drv.c b/arch/mips/mti-sead3/sead3-i2c-drv.c
index 1f787a6..4d72e0e 100644
--- a/arch/mips/mti-sead3/sead3-i2c-drv.c
+++ b/arch/mips/mti-sead3/sead3-i2c-drv.c
@@ -304,22 +304,18 @@ static int sead3_i2c_platform_probe(struct platform_device *pdev)
 	int ret;
 
 	r = platform_get_resource(pdev, IORESOURCE_MEM, 0);
-	if (!r) {
-		ret = -ENODEV;
-		goto out;
-	}
+	if (!r)
+		return -ENODEV;
 
-	priv = kzalloc(sizeof(struct pic32_i2c_platform_data), GFP_KERNEL);
-	if (!priv) {
-		ret = -ENOMEM;
-		goto out;
-	}
+	priv = devm_kzalloc(&pdev->dev,
+			    sizeof(struct pic32_i2c_platform_data),
+			    GFP_KERNEL);
+	if (!priv)
+		return -ENOMEM;
 
 	priv->base = r->start;
-	if (!priv->base) {
-		ret = -EBUSY;
-		goto out_mem;
-	}
+	if (!priv->base)
+		return -EBUSY;
 
 	priv->xfer_timeout = 200;
 	priv->ack_timeout = 200;
@@ -334,15 +330,11 @@ static int sead3_i2c_platform_probe(struct platform_device *pdev)
 	sead3_i2c_platform_setup(priv);
 
 	ret = i2c_add_numbered_adapter(&priv->adap);
-	if (ret == 0) {
-		platform_set_drvdata(pdev, priv);
-		return 0;
-	}
-
-out_mem:
-	kfree(priv);
-out:
-	return ret;
+	if (ret)
+		return ret;
+	
+	platform_set_drvdata(pdev, priv);
+	return 0;
 }
 
 static int sead3_i2c_platform_remove(struct platform_device *pdev)
@@ -351,7 +343,6 @@ static int sead3_i2c_platform_remove(struct platform_device *pdev)
 
 	platform_set_drvdata(pdev, NULL);
 	i2c_del_adapter(&priv->adap);
-	kfree(priv);
 	return 0;
 }
 
-- 
1.9.1

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