Re: [PATCH] backlight: l4f00242t03: check return value ofregulator_enable()

From: Jingoo Han
Date: Mon Mar 11 2013 - 19:54:30 EST


On Tuesday, March 12, 2013 7:28 AM, Andrew Morton wrote:
>
> On Mon, 11 Mar 2013 12:58:41 +0900 Jingoo Han <jg1.han@xxxxxxxxxxx> wrote:
>
> > 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@xxxxxxxxxxx>
> > ---
> > drivers/video/backlight/l4f00242t03.c | 27 ++++++++++++++++++++++-----
> > 1 files changed, 22 insertions(+), 5 deletions(-)
> >
> > diff --git a/drivers/video/backlight/l4f00242t03.c b/drivers/video/backlight/l4f00242t03.c
> > index fb61557..8d54c3c 100644
> > --- a/drivers/video/backlight/l4f00242t03.c
> > +++ b/drivers/video/backlight/l4f00242t03.c
> > @@ -51,14 +51,31 @@ 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");
> > + return;
>
> Should the IO regulator be disabled before returning?
Hi Andrew,

OK, I see.
I will send v2 patch.
Thank you :)

Best regards,
Jingoo Han

>
> > + }
> > + ret = regulator_enable(priv->core_reg);
> > + if (ret) {
> > + dev_err(&spi->dev, "failed to enable the core regulator.\n");
> > + return;
> > + }
>
> Ditto.

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