linux-kernel - [PATCH v2 2/3][RESEND] backlight: ot200_bl: use devm

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Message-id: <001c01cd3d2e$0505f980$0f11ec80$%han@samsung.com>
Date:	Tue, 29 May 2012 09:00:12 +0900
From:	Jingoo Han <jg1.han@...sung.com>
To:	'Andrew Morton' <akpm@...ux-foundation.org>,
	'LKML' <linux-kernel@...r.kernel.org>
Cc:	'Richard Purdie' <rpurdie@...ys.net>,
	'Christian Gmeiner' <christian.gmeiner@...il.com>,
	'Jingoo Han' <jg1.han@...sung.com>
Subject: [PATCH v2 2/3][RESEND] backlight: ot200_bl: use devm_ functions

The devm_ functions allocate memory that is released when a driver
detaches. This patch uses devm_kzalloc of these functions

Cc: Christian Gmeiner <christian.gmeiner@...il.com>
Cc: Richard Purdie <rpurdie@...ys.net>
Signed-off-by: Jingoo Han <jg1.han@...sung.com>
---
 drivers/video/backlight/ot200_bl.c |   12 ++++--------
 1 files changed, 4 insertions(+), 8 deletions(-)

diff --git a/drivers/video/backlight/ot200_bl.c b/drivers/video/backlight/ot200_bl.c
index f519d55..ef637ff 100644
--- a/drivers/video/backlight/ot200_bl.c
+++ b/drivers/video/backlight/ot200_bl.c
@@ -97,10 +97,10 @@ static int ot200_backlight_probe(struct platform_device *pdev)
 		goto error_mfgpt_alloc;
 	}
 
-	data = kzalloc(sizeof(*data), GFP_KERNEL);
+	data = devm_kzalloc(&pdev->dev, sizeof(*data), GFP_KERNEL);
 	if (!data) {
 		retval = -ENOMEM;
-		goto error_kzalloc;
+		goto error_devm_kzalloc;
 	}
 
 	/* setup gpio */
@@ -122,16 +122,14 @@ static int ot200_backlight_probe(struct platform_device *pdev)
 	if (IS_ERR(bl)) {
 		dev_err(&pdev->dev, "failed to register backlight\n");
 		retval = PTR_ERR(bl);
-		goto error_backlight_device_register;
+		goto error_devm_kzalloc;
 	}
 
 	platform_set_drvdata(pdev, bl);
 
 	return 0;
 
-error_backlight_device_register:
-	kfree(data);
-error_kzalloc:
+error_devm_kzalloc:
 	cs5535_mfgpt_free_timer(pwm_timer);
 error_mfgpt_alloc:
 	gpio_free(GPIO_DIMM);
@@ -141,7 +139,6 @@ error_mfgpt_alloc:
 static int ot200_backlight_remove(struct platform_device *pdev)
 {
 	struct backlight_device *bl = platform_get_drvdata(pdev);
-	struct ot200_backlight_data *data = bl_get_data(bl);
 
 	backlight_device_unregister(bl);
 
@@ -154,7 +151,6 @@ static int ot200_backlight_remove(struct platform_device *pdev)
 	cs5535_mfgpt_free_timer(pwm_timer);
 	gpio_free(GPIO_DIMM);
 
-	kfree(data);
 	return 0;
 }
 
-- 
1.7.1


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