[PATCH] touchscreen: Introduce the use of the managed version of kzalloc

[Himangi Saraogi]

This patch moves data allocated using kzalloc to managed data allocated
using devm_kzalloc and cleans now unnecessary kfrees in probe and remove
functions. Also data allocated using input_allocate_device is moved to
devm_input_allocate_device and unnecessary labels are removed.

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 <himangi...@gmail.com>
---
 drivers/input/touchscreen/da9034-ts.c | 17 +++++------------
 1 file changed, 5 insertions(+), 12 deletions(-)

diff --git a/drivers/input/touchscreen/da9034-ts.c 
b/drivers/input/touchscreen/da9034-ts.c
index 8ccf7bb..ed85744 100644
--- a/drivers/input/touchscreen/da9034-ts.c
+++ b/drivers/input/touchscreen/da9034-ts.c
@@ -303,7 +303,8 @@ static int da9034_touch_probe(struct platform_device *pdev)
        struct input_dev *input_dev;
        int ret;
 
-       touch = kzalloc(sizeof(struct da9034_touch), GFP_KERNEL);
+       touch = devm_kzalloc(&pdev->dev, sizeof(struct da9034_touch),
+                            GFP_KERNEL);
        if (touch == NULL) {
                dev_err(&pdev->dev, "failed to allocate driver data\n");
                return -ENOMEM;
@@ -322,11 +323,10 @@ static int da9034_touch_probe(struct platform_device 
*pdev)
        INIT_DELAYED_WORK(&touch->tsi_work, da9034_tsi_work);
        touch->notifier.notifier_call = da9034_touch_notifier;
 
-       input_dev = input_allocate_device();
+       input_dev = devm_input_allocate_device(&pdev->dev);
        if (!input_dev) {
                dev_err(&pdev->dev, "failed to allocate input device\n");
-               ret = -ENOMEM;
-               goto err_free_touch;
+               return -ENOMEM;
        }
 
        input_dev->name         = pdev->name;
@@ -348,16 +348,10 @@ static int da9034_touch_probe(struct platform_device 
*pdev)
 
        ret = input_register_device(input_dev);
        if (ret)
-               goto err_free_input;
+               return ret;
 
        platform_set_drvdata(pdev, touch);
        return 0;
-
-err_free_input:
-       input_free_device(input_dev);
-err_free_touch:
-       kfree(touch);
-       return ret;
 }
 
 static int da9034_touch_remove(struct platform_device *pdev)
@@ -365,7 +359,6 @@ static int da9034_touch_remove(struct platform_device *pdev)
        struct da9034_touch *touch = platform_get_drvdata(pdev);
 
        input_unregister_device(touch->input_dev);
-       kfree(touch);
 
        return 0;
 }
-- 
1.9.1

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