[PATCH] input: jornada680_kbd: Allocate resources using managed interfaces

[PATCH] input: jornada680_kbd: Allocate resources using managed interfaces

[Himangi Saraogi]

This patch moves most data allocated in the probe function from
unmanaged interfaces to managed interfaces. The kfrees and error
handling code is done away with. Also, the unnecesary labels are
removed and the function mrstouch_remove is removed as it becomes
empty after removing the no longer required function calls. 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 a part of
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>
---
Not compile tested due to incompatible architecture.

 drivers/input/keyboard/jornada680_kbd.c | 21 ++++-----------------
 1 file changed, 4 insertions(+), 17 deletions(-)

diff --git a/drivers/input/keyboard/jornada680_kbd.c b/drivers/input/keyboard/jornada680_kbd.c
index 69b1f00..806dc6b 100644
--- a/drivers/input/keyboard/jornada680_kbd.c
+++ b/drivers/input/keyboard/jornada680_kbd.c
@@ -16,6 +16,7 @@
  * published by the Free Software Foundation.
  */
 
+#include <linux/device.h>
 #include <linux/input.h>
 #include <linux/input-polldev.h>
 #include <linux/interrupt.h>
@@ -185,11 +186,12 @@ static int jornada680kbd_probe(struct platform_device *pdev)
 	struct input_dev *input_dev;
 	int i, error;
 
-	jornadakbd = kzalloc(sizeof(struct jornadakbd), GFP_KERNEL);
+	jornadakbd = devm_kzalloc(&pdev->dev, sizeof(struct jornadakbd),
+				  GFP_KERNEL);
 	if (!jornadakbd)
 		return -ENOMEM;
 
-	poll_dev = input_allocate_polled_device();
+	poll_dev = devm_input_allocate_polled_device(&pdev->dev);
 	if (!poll_dev) {
 		error = -ENOMEM;
 		goto failed;
@@ -232,21 +234,7 @@ static int jornada680kbd_probe(struct platform_device *pdev)
  failed:
 	printk(KERN_ERR "Jornadakbd: failed to register driver, error: %d\n",
 		error);
-	input_free_polled_device(poll_dev);
-	kfree(jornadakbd);
 	return error;
-
-}
-
-static int jornada680kbd_remove(struct platform_device *pdev)
-{
-	struct jornadakbd *jornadakbd = platform_get_drvdata(pdev);
-
-	input_unregister_polled_device(jornadakbd->poll_dev);
-	input_free_polled_device(jornadakbd->poll_dev);
-	kfree(jornadakbd);
-
-	return 0;
 }
 
 static struct platform_driver jornada680kbd_driver = {
@@ -255,7 +243,6 @@ static struct platform_driver jornada680kbd_driver = {
 		.owner	= THIS_MODULE,
 	},
 	.probe	= jornada680kbd_probe,
-	.remove	= jornada680kbd_remove,
 };
 module_platform_driver(jornada680kbd_driver);
 
-- 
1.9.1

Re: [PATCH] input: jornada680_kbd: Allocate resources using managed interfaces

[Dmitry Torokhov]

On Sat, May 24, 2014 at 05:47:09PM +0530, Himangi Saraogi wrote:
> This patch moves most data allocated in the probe function from
> unmanaged interfaces to managed interfaces. The kfrees and error
> handling code is done away with. Also, the unnecesary labels are
> removed and the function mrstouch_remove is removed as it becomes
> empty after removing the no longer required function calls. Also,
> linux/device.h is added to make sure the devm_*() routine declarations
> are unambiguously available.

Applied, thank you.

-- 
Dmitry