linux-kernel - [PATCH] leds: lm3556: Don't call kfree for the memory allocated by devm

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Date:	Sun, 22 Apr 2012 22:57:13 +0800
From:	Axel Lin <axel.lin@...il.com>
To:	linux-kernel@...r.kernel.org
Cc:	Geon Si Jeong <gshark.jeong@...il.com>,
	Woogyom Kim <milo.kim@...com>,
	Richard Purdie <rpurdie@...ys.net>,
	Andrew Morton <akpm@...ux-foundation.org>
Subject: [PATCH] leds: lm3556: Don't call kfree for the memory allocated by
 devm_kzalloc

The devm_* functions eliminate the need for manual resource releasing
and simplify error handling. Resources allocated by devm_* are freed
automatically on driver detach.

Thus adding kfree calls here will introduce double free bug.

Signed-off-by: Axel Lin <axel.lin@...il.com>
---
 drivers/leds/leds-lm3556.c |    7 ++-----
 1 files changed, 2 insertions(+), 5 deletions(-)

diff --git a/drivers/leds/leds-lm3556.c b/drivers/leds/leds-lm3556.c
index cc0abbc..15a5acd 100644
--- a/drivers/leds/leds-lm3556.c
+++ b/drivers/leds/leds-lm3556.c
@@ -360,9 +360,8 @@ static int lm3556_probe(struct i2c_client *client,
 		return -ENODATA;
 	}
 
-	chip =
-	    devm_kzalloc(&client->dev, sizeof(struct lm3556_chip_data),
-			 GFP_KERNEL);
+	chip = devm_kzalloc(&client->dev, sizeof(struct lm3556_chip_data),
+			    GFP_KERNEL);
 	if (!chip)
 		return -ENOMEM;
 
@@ -416,7 +415,6 @@ err_create_torch_file:
 err_create_flash_file:
 err_chip_init:
 	i2c_set_clientdata(client, NULL);
-	kfree(chip);
 	return err;
 }
 
@@ -430,7 +428,6 @@ static int lm3556_remove(struct i2c_client *client)
 	led_classdev_unregister(&chip->cdev_flash);
 	lm3556_write_reg(client, REG_ENABLE, 0);
 
-	kfree(chip);
 	return 0;
 }
 
-- 
1.7.5.4



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