drivers/video/backlight/l4f00242t03.c: check return value of regulator_enable()

regulator_enable() is 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@samsung.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

1 files changed, 23 insertions, 4 deletions

diff --git a/drivers/video/backlight/l4f00242t03.c b/drivers/video/backlight/l4f00242t03.c
index fb6155771326..a35a38c709cf 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);