linux-kernel - [PATCH 10/10] iio: imu: adis16480: use state lock for filter freq set

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Message-ID: <20190926111812.15957-11-alexandru.ardelean@analog.com>
Date:   Thu, 26 Sep 2019 14:18:12 +0300
From:   Alexandru Ardelean <alexandru.ardelean@...log.com>
To:     <linux-iio@...r.kernel.org>, <linux-kernel@...r.kernel.org>
CC:     <jic23@...nel.org>,
        Alexandru Ardelean <alexandru.ardelean@...log.com>
Subject: [PATCH 10/10] iio: imu: adis16480: use state lock for filter freq set

It's the only operation that does 2 operations (a read & a write), so the
unlocked functions can be used under a single state lock.

Signed-off-by: Alexandru Ardelean <alexandru.ardelean@...log.com>
---
 drivers/iio/imu/adis16480.c | 13 ++++++++++---
 1 file changed, 10 insertions(+), 3 deletions(-)

diff --git a/drivers/iio/imu/adis16480.c b/drivers/iio/imu/adis16480.c
index dc13d8a33612..01dae50e985b 100644
--- a/drivers/iio/imu/adis16480.c
+++ b/drivers/iio/imu/adis16480.c
@@ -550,6 +550,7 @@ static int adis16480_set_filter_freq(struct iio_dev *indio_dev,
 	const struct iio_chan_spec *chan, unsigned int freq)
 {
 	struct adis16480 *st = iio_priv(indio_dev);
+	struct mutex *slock = &st->adis.state_lock;
 	unsigned int enable_mask, offset, reg;
 	unsigned int diff, best_diff;
 	unsigned int i, best_freq;
@@ -560,9 +561,11 @@ static int adis16480_set_filter_freq(struct iio_dev *indio_dev,
 	offset = ad16480_filter_data[chan->scan_index][1];
 	enable_mask = BIT(offset + 2);
 
-	ret = adis_read_reg_16(&st->adis, reg, &val);
+	mutex_lock(slock);
+
+	ret = __adis_read_reg_16(&st->adis, reg, &val);
 	if (ret < 0)
-		return ret;
+		goto out_unlock;
 
 	if (freq == 0) {
 		val &= ~enable_mask;
@@ -584,7 +587,11 @@ static int adis16480_set_filter_freq(struct iio_dev *indio_dev,
 		val |= enable_mask;
 	}
 
-	return adis_write_reg_16(&st->adis, reg, val);
+	ret = __adis_write_reg_16(&st->adis, reg, val);
+out_unlock:
+	mutex_unlock(slock);
+
+	return ret;
 }
 
 static int adis16480_read_raw(struct iio_dev *indio_dev,
-- 
2.20.1