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iio:adc:lpc32xx Handle return value of clk_prepare_enable 

clk_prepare_enable() can fail here and we must check its return value.

Signed-off-by: Arvind Yadav <arvind.yadav.cs@gmail.com>
Signed-off-by: Jonathan Cameron <jic23@kernel.org>
This commit is contained in:
Arvind Yadav 2017-05-30 16:35:27 +05:30 committed by Jonathan Cameron
parent f4f93bf77d
commit 42d97ac6a8
1 changed files with 6 additions and 2 deletions
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8
drivers/iio/adc/lpc32xx_adc.c
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@ -76,10 +76,14 @@ static int lpc32xx_read_raw(struct iio_dev *indio_dev,
long mask) long mask)
{ {
struct lpc32xx_adc_state *st = iio_priv(indio_dev); struct lpc32xx_adc_state *st = iio_priv(indio_dev);
int ret;
if (mask == IIO_CHAN_INFO_RAW) { if (mask == IIO_CHAN_INFO_RAW) {
mutex_lock(&indio_dev->mlock); mutex_lock(&indio_dev->mlock);
clk_prepare_enable(st->clk); ret = clk_prepare_enable(st->clk);
if (ret) {
mutex_unlock(&indio_dev->mlock);
return ret;
}
/* Measurement setup */ /* Measurement setup */
__raw_writel(LPC32XXAD_INTERNAL | (chan->address) | __raw_writel(LPC32XXAD_INTERNAL | (chan->address) |
LPC32XXAD_REFp | LPC32XXAD_REFm, LPC32XXAD_REFp | LPC32XXAD_REFm,