linux-kernel - [PATCH 3.12 071/181] iio: Fix endianness issue in ak8975_read

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Message-Id: <19e0dc1edc5e235b298d793a5fd136d154f354c8.1404128998.git.jslaby@suse.cz>
Date:	Mon, 30 Jun 2014 13:51:32 +0200
From:	Jiri Slaby <jslaby@...e.cz>
To:	stable@...r.kernel.org
Cc:	linux-kernel@...r.kernel.org, Peter Meerwald <pmeerw@...erw.net>,
	Jonathan Cameron <jic23@...nel.org>,
	Jiri Slaby <jslaby@...e.cz>
Subject: [PATCH 3.12 071/181] iio: Fix endianness issue in ak8975_read_axis()

From: Peter Meerwald <pmeerw@...erw.net>

3.12-stable review patch.  If anyone has any objections, please let me know.

===============

commit 8ba42fb7b17649c9ab5b5e79d4e90370a0b4645e upstream.

i2c_smbus_read_word_data() does host endian conversion already,
no need for le16_to_cpu()

Signed-off-by: Peter Meerwald <pmeerw@...erw.net>
Signed-off-by: Jonathan Cameron <jic23@...nel.org>
Signed-off-by: Jiri Slaby <jslaby@...e.cz>
---
 drivers/iio/magnetometer/ak8975.c | 9 +--------
 1 file changed, 1 insertion(+), 8 deletions(-)

diff --git a/drivers/iio/magnetometer/ak8975.c b/drivers/iio/magnetometer/ak8975.c
index 9edf4c935fd7..aeba3bbdadb0 100644
--- a/drivers/iio/magnetometer/ak8975.c
+++ b/drivers/iio/magnetometer/ak8975.c
@@ -352,8 +352,6 @@ static int ak8975_read_axis(struct iio_dev *indio_dev, int index, int *val)
 {
 	struct ak8975_data *data = iio_priv(indio_dev);
 	struct i2c_client *client = data->client;
-	u16 meas_reg;
-	s16 raw;
 	int ret;
 
 	mutex_lock(&data->lock);
@@ -401,16 +399,11 @@ static int ak8975_read_axis(struct iio_dev *indio_dev, int index, int *val)
 		dev_err(&client->dev, "Read axis data fails\n");
 		goto exit;
 	}
-	meas_reg = ret;
 
 	mutex_unlock(&data->lock);
 
-	/* Endian conversion of the measured values. */
-	raw = (s16) (le16_to_cpu(meas_reg));
-
 	/* Clamp to valid range. */
-	raw = clamp_t(s16, raw, -4096, 4095);
-	*val = raw;
+	*val = clamp_t(s16, ret, -4096, 4095);
 	return IIO_VAL_INT;
 
 exit:
-- 
2.0.0

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