linux-kernel - [PATCH v2 1/5] Input: adp5589: use devm_kzalloc() to allocate the kpad object

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Date:   Thu, 12 Nov 2020 09:43:04 +0200
From:   Alexandru Ardelean <alexandru.ardelean@...log.com>
To:     <linux-input@...r.kernel.org>, <linux-kernel@...r.kernel.org>
CC:     <dmitry.torokhov@...il.com>,
        Alexandru Ardelean <alexandru.ardelean@...log.com>
Subject: [PATCH v2 1/5] Input: adp5589: use devm_kzalloc() to allocate the kpad object

This removes the need to manually free the kpad object and cleans up some
exit/error paths.
The error path cleanup should reduce the risk of any memory leaks with this
object.

Signed-off-by: Alexandru Ardelean <alexandru.ardelean@...log.com>
---
 drivers/input/keyboard/adp5589-keys.c | 13 ++++---------
 1 file changed, 4 insertions(+), 9 deletions(-)

diff --git a/drivers/input/keyboard/adp5589-keys.c b/drivers/input/keyboard/adp5589-keys.c
index eb0e9cd66bcb..922497b65ab0 100644
--- a/drivers/input/keyboard/adp5589-keys.c
+++ b/drivers/input/keyboard/adp5589-keys.c
@@ -1007,7 +1007,7 @@ static int adp5589_probe(struct i2c_client *client,
 		return -EINVAL;
 	}
 
-	kpad = kzalloc(sizeof(*kpad), GFP_KERNEL);
+	kpad = devm_kzalloc(&client->dev, sizeof(*kpad), GFP_KERNEL);
 	if (!kpad)
 		return -ENOMEM;
 
@@ -1028,17 +1028,15 @@ static int adp5589_probe(struct i2c_client *client,
 	}
 
 	ret = adp5589_read(client, ADP5589_5_ID);
-	if (ret < 0) {
-		error = ret;
-		goto err_free_mem;
-	}
+	if (ret < 0)
+		return ret;
 
 	revid = (u8) ret & ADP5589_5_DEVICE_ID_MASK;
 
 	if (pdata->keymapsize) {
 		error = adp5589_keypad_add(kpad, revid);
 		if (error)
-			goto err_free_mem;
+			return error;
 	}
 
 	error = adp5589_setup(kpad);
@@ -1059,8 +1057,6 @@ static int adp5589_probe(struct i2c_client *client,
 
 err_keypad_remove:
 	adp5589_keypad_remove(kpad);
-err_free_mem:
-	kfree(kpad);
 
 	return error;
 }
@@ -1072,7 +1068,6 @@ static int adp5589_remove(struct i2c_client *client)
 	adp5589_write(client, kpad->var->reg(ADP5589_GENERAL_CFG), 0);
 	adp5589_keypad_remove(kpad);
 	adp5589_gpio_remove(kpad);
-	kfree(kpad);
 
 	return 0;
 }
-- 
2.17.1