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Subject[PATCH] ideapad_laptop: 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 label sysfs_failed is removed as it is no longer
required. Also, linux/device.h is added to make sure the devm_*()
routine declarations are unambiguously available.

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@gmail.com>
Acked-by: Julia Lawall <julia.lawall@lip6.fr>
---
Not compile tested due to incompatible architecture.
drivers/platform/x86/ideapad-laptop.c | 8 +++-----
1 file changed, 3 insertions(+), 5 deletions(-)

diff --git a/drivers/platform/x86/ideapad-laptop.c b/drivers/platform/x86/ideapad-laptop.c
index 6dd060a..aadfb1f 100644
--- a/drivers/platform/x86/ideapad-laptop.c
+++ b/drivers/platform/x86/ideapad-laptop.c
@@ -36,6 +36,7 @@
#include <linux/debugfs.h>
#include <linux/seq_file.h>
#include <linux/i8042.h>
+#include <linux/device.h>

#define IDEAPAD_RFKILL_DEV_NUM (3)

@@ -833,7 +834,7 @@ static int ideapad_acpi_add(struct platform_device *pdev)
if (read_method_int(adev->handle, "_CFG", &cfg))
return -ENODEV;

- priv = kzalloc(sizeof(*priv), GFP_KERNEL);
+ priv = devm_kzalloc(&pdev->dev, sizeof(*priv), GFP_KERNEL);
if (!priv)
return -ENOMEM;

@@ -844,7 +845,7 @@ static int ideapad_acpi_add(struct platform_device *pdev)

ret = ideapad_sysfs_init(priv);
if (ret)
- goto sysfs_failed;
+ return ret;

ret = ideapad_debugfs_init(priv);
if (ret)
@@ -884,8 +885,6 @@ input_failed:
ideapad_debugfs_exit(priv);
debugfs_failed:
ideapad_sysfs_exit(priv);
-sysfs_failed:
- kfree(priv);
return ret;
}

@@ -903,7 +902,6 @@ static int ideapad_acpi_remove(struct platform_device *pdev)
ideapad_debugfs_exit(priv);
ideapad_sysfs_exit(priv);
dev_set_drvdata(&pdev->dev, NULL);
- kfree(priv);

return 0;
}
--
1.9.1


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