ieee802154: 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 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);
...>
}

---
 drivers/net/ieee802154/fakelb.c | 5 ++---
 1 file changed, 2 insertions(+), 3 deletions(-)

index b8d2217..0bddcde 100644
@@ -228,7 +228,8 @@ static int fakelb_probe(struct platform_device *pdev)
 	int err = -ENOMEM;
 	int i;
 
-	priv = kzalloc(sizeof(struct fakelb_priv), GFP_KERNEL);
+	priv = devm_kzalloc(&pdev->dev, sizeof(struct fakelb_priv),
+			    GFP_KERNEL);
 	if (!priv)
 		goto err_alloc;
 

@@ -248,7 +249,6 @@ static int fakelb_probe(struct platform_device *pdev)
 err_slave:
 	list_for_each_entry(dp, &priv->list, list)
 		fakelb_del(dp);
-	kfree(priv);
 err_alloc:
 	return err;
 }

@@ -260,7 +260,6 @@ static int fakelb_remove(struct platform_device *pdev)
 
 	list_for_each_entry_safe(dp, temp, &priv->list, list)
 		fakelb_del(dp);
-	kfree(priv);
 
 	return 0;
 }

1.9.1

From: Himangi Saraogi <[email protected]>
Date: Fri, 16 May 2014 23:39:35 +0530

Likewise please add an explicit linux/device.h include to make sure the devm_*() routine declarations are unambiguously available.