[PATCH] Input: soc_button_array: Remove kfree on data allocated with devm_zalloc

[pramod.gurav.etc@gmail.com]

From: Pramod Gurav <pramod.gurav@smartplayin.com>

This patch does below:
- Removes kfree done on data allocated with devm_zalloc in probe
  path of the driver.
- Adds a check on return value from devm_kzalloc which was missing
  and renames a lable from err_free_mem to err_mem.
- Adds couple of dev_err on failure to allocate memory

CC: Dmitry Torokhov <dmitry.torokhov@gmail.com>
CC: Lejun Zhu <lejun.zhu@linux.intel.com>
CC: Sachin Kamat <sachin.kamat@linaro.org>

Signed-off-by: Pramod Gurav <pramod.gurav@smartplayin.com>
---
 drivers/input/misc/soc_button_array.c |   19 ++++++++++++++-----
 1 file changed, 14 insertions(+), 5 deletions(-)

diff --git a/drivers/input/misc/soc_button_array.c b/drivers/input/misc/soc_button_array.c
index 5a6334b..ac82971 100644
--- a/drivers/input/misc/soc_button_array.c
+++ b/drivers/input/misc/soc_button_array.c
@@ -83,6 +83,13 @@ soc_button_device_create(struct pnp_dev *pdev,
 				       sizeof(*gpio_keys_pdata) +
 					sizeof(*gpio_keys) * MAX_NBUTTONS,
 				       GFP_KERNEL);
+	if (!gpio_keys_pdata) {
+		dev_err(&pdev->dev,
+			"Can't allocate memory for gpio_keys_platform_data\n");
+		error = -ENOMEM;
+		goto err_mem;
+	}
+
 	gpio_keys = (void *)(gpio_keys_pdata + 1);
 
 	for (info = button_info; info->name; info++) {
@@ -104,7 +111,7 @@ soc_button_device_create(struct pnp_dev *pdev,
 
 	if (n_buttons == 0) {
 		error = -ENODEV;
-		goto err_free_mem;
+		goto err_mem;
 	}
 
 	gpio_keys_pdata->buttons = gpio_keys;
@@ -114,7 +121,7 @@ soc_button_device_create(struct pnp_dev *pdev,
 	pd = platform_device_alloc("gpio-keys", PLATFORM_DEVID_AUTO);
 	if (!pd) {
 		error = -ENOMEM;
-		goto err_free_mem;
+		goto err_mem;
 	}
 
 	error = platform_device_add_data(pd, gpio_keys_pdata,
@@ -130,8 +137,7 @@ soc_button_device_create(struct pnp_dev *pdev,
 
 err_free_pdev:
 	platform_device_put(pd);
-err_free_mem:
-	devm_kfree(&pdev->dev, gpio_keys_pdata);
+err_mem:
 	return ERR_PTR(error);
 }
 
@@ -155,8 +161,11 @@ static int soc_button_pnp_probe(struct pnp_dev *pdev,
 	int error;
 
 	priv = devm_kzalloc(&pdev->dev, sizeof(*priv), GFP_KERNEL);
-	if (!priv)
+	if (!priv) {
+		dev_err(&pdev->dev,
+			"Can't allocate memory for soc_button_data\n");
 		return -ENOMEM;
+	}
 
 	pnp_set_drvdata(pdev, priv);
 
-- 
1.7.9.5