linux-kernel - [PATCH] iio:adc:lpc32xx Handle return value of clk_prepare

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Date:   Tue, 30 May 2017 16:35:27 +0530
From:   Arvind Yadav <arvind.yadav.cs@...il.com>
To:     jic23@...nel.org, knaack.h@....de, lars@...afoo.de,
        pmeerw@...erw.net, vz@...ia.com, slemieux.tyco@...il.com
Cc:     linux-iio@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
        linux-kernel@...r.kernel.org
Subject: [PATCH] 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@...il.com>
---
 drivers/iio/adc/lpc32xx_adc.c | 8 ++++++--
 1 file changed, 6 insertions(+), 2 deletions(-)

diff --git a/drivers/iio/adc/lpc32xx_adc.c b/drivers/iio/adc/lpc32xx_adc.c
index 0de709b..6a5b9a9 100644
--- a/drivers/iio/adc/lpc32xx_adc.c
+++ b/drivers/iio/adc/lpc32xx_adc.c
@@ -76,10 +76,14 @@ static int lpc32xx_read_raw(struct iio_dev *indio_dev,
 			    long mask)
 {
 	struct lpc32xx_adc_state *st = iio_priv(indio_dev);
-
+	int ret;
 	if (mask == IIO_CHAN_INFO_RAW) {
 		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 */
 		__raw_writel(LPC32XXAD_INTERNAL | (chan->address) |
 			     LPC32XXAD_REFp | LPC32XXAD_REFm,
-- 
1.9.1