linux-kernel - [PATCH v2] backlight: l4f00242t03: check return value of regulator

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Message-id: <008e01ce1eb4$df3a9cb0$9dafd610$%han@samsung.com>
Date:	Tue, 12 Mar 2013 09:02:22 +0900
From:	Jingoo Han <jg1.han@...sung.com>
To:	'Andrew Morton' <akpm@...ux-foundation.org>
Cc:	'LKML' <linux-kernel@...r.kernel.org>,
	'Richard Purdie' <rpurdie@...ys.net>,
	'Jingoo Han' <jg1.han@...sung.com>
Subject: [PATCH v2] backlight: l4f00242t03: check return value of
 regulator_enable()

The regulator_enable() was marked as as __must_check, therefore,
the return value of regulator_enable() should be checked.
Also, this patch checks return value of regulator_set_voltage().

Signed-off-by: Jingoo Han <jg1.han@...sung.com>
---
Change since v1:
- Added regulator_disable() for IO regulator before returning

 drivers/video/backlight/l4f00242t03.c |   29 ++++++++++++++++++++++++-----
 1 files changed, 24 insertions(+), 5 deletions(-)

diff --git a/drivers/video/backlight/l4f00242t03.c b/drivers/video/backlight/l4f00242t03.c
index fb61557..a35a38c 100644
--- a/drivers/video/backlight/l4f00242t03.c
+++ b/drivers/video/backlight/l4f00242t03.c
@@ -51,14 +51,33 @@ static void l4f00242t03_lcd_init(struct spi_device *spi)
 	struct l4f00242t03_pdata *pdata = spi->dev.platform_data;
 	struct l4f00242t03_priv *priv = spi_get_drvdata(spi);
 	const u16 cmd[] = { 0x36, param(0), 0x3A, param(0x60) };
+	int ret;
 
 	dev_dbg(&spi->dev, "initializing LCD\n");
 
-	regulator_set_voltage(priv->io_reg, 1800000, 1800000);
-	regulator_enable(priv->io_reg);
+	ret = regulator_set_voltage(priv->io_reg, 1800000, 1800000);
+	if (ret) {
+		dev_err(&spi->dev, "failed to set the IO regulator voltage.\n");
+		return;
+	}
+	ret = regulator_enable(priv->io_reg);
+	if (ret) {
+		dev_err(&spi->dev, "failed to enable the IO regulator.\n");
+		return;
+	}
 
-	regulator_set_voltage(priv->core_reg, 2800000, 2800000);
-	regulator_enable(priv->core_reg);
+	ret = regulator_set_voltage(priv->core_reg, 2800000, 2800000);
+	if (ret) {
+		dev_err(&spi->dev, "failed to set the core regulator voltage.\n");
+		regulator_disable(priv->io_reg);
+		return;
+	}
+	ret = regulator_enable(priv->core_reg);
+	if (ret) {
+		dev_err(&spi->dev, "failed to enable the core regulator.\n");
+		regulator_disable(priv->io_reg);
+		return;
+	}
 
 	l4f00242t03_reset(pdata->reset_gpio);
 
-- 
1.7.2.5


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