linux-kernel - [PATCH v3 03/28] staging: iio: tsl2583: check if chip is suspended in in_illuminance_calibrate

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Date:   Thu, 10 Nov 2016 04:25:39 -0500
From:   Brian Masney <masneyb@...tation.org>
To:     jic23@...nel.org, linux-iio@...r.kernel.org
Cc:     devel@...verdev.osuosl.org, gregkh@...uxfoundation.org,
        lars@...afoo.de, pmeerw@...erw.net, knaack.h@....de,
        linux-kernel@...r.kernel.org, Jon.Brenner@....com
Subject: [PATCH v3 03/28] staging: iio: tsl2583: check if chip is suspended in in_illuminance_calibrate_store

in_illuminance_calibrate_store() did not check to see if the chip is
suspended. This patch adds the proper check. The return value from
taos_als_calibrate() was also not checked in this function, so the
proper check was also added while changes are being made here.

Signed-off-by: Brian Masney <masneyb@...tation.org>
---
 drivers/staging/iio/light/tsl2583.c | 17 ++++++++++++++---
 1 file changed, 14 insertions(+), 3 deletions(-)

diff --git a/drivers/staging/iio/light/tsl2583.c b/drivers/staging/iio/light/tsl2583.c
index 1a7be12..eb59ea0 100644
--- a/drivers/staging/iio/light/tsl2583.c
+++ b/drivers/staging/iio/light/tsl2583.c
@@ -501,16 +501,27 @@ static ssize_t in_illuminance_calibrate_store(struct device *dev,
 {
 	struct iio_dev *indio_dev = dev_to_iio_dev(dev);
 	struct tsl2583_chip *chip = iio_priv(indio_dev);
-	int value;
+	int value, ret;
 
 	if (kstrtoint(buf, 0, &value) || value != 1)
 		return -EINVAL;
 
 	mutex_lock(&chip->als_mutex);
-	taos_als_calibrate(indio_dev);
+
+	if (chip->suspended) {
+		ret = -EBUSY;
+		goto done;
+	}
+
+	ret = taos_als_calibrate(indio_dev);
+	if (ret < 0)
+		goto done;
+
+	ret = len;
+done:
 	mutex_unlock(&chip->als_mutex);
 
-	return len;
+	return ret;
 }
 
 static ssize_t in_illuminance_lux_table_show(struct device *dev,
-- 
2.7.4