diff mbox series

[4.4,35/36] iio: vcnl4000: Fix i2c swapped word reading.

Message ID 20200609173935.835075859@linuxfoundation.org
State New
Headers show
Series None | expand

Commit Message

Greg Kroah-Hartman June 9, 2020, 5:44 p.m. UTC 
From: Mathieu Othacehe <m.othacehe@gmail.com>

[ Upstream commit 18dfb5326370991c81a6d1ed6d1aeee055cb8c05 ]

The bytes returned by the i2c reading need to be swapped
unconditionally. Otherwise, on be16 platforms, an incorrect value will be
returned.

Taking the slow path via next merge window as its been around a while
and we have a patch set dependent on this which would be held up.

Fixes: 62a1efb9f868 ("iio: add vcnl4000 combined ALS and proximity sensor")
Signed-off-by: Mathieu Othacehe <m.othacehe@gmail.com>
Cc: <Stable@vger.kernel.org>
Signed-off-by: Jonathan Cameron <Jonathan.Cameron@huawei.com>
Signed-off-by: Sasha Levin <sashal@kernel.org>
---
 drivers/iio/light/vcnl4000.c | 6 ++----
 1 file changed, 2 insertions(+), 4 deletions(-)
diff mbox series

Patch

diff --git a/drivers/iio/light/vcnl4000.c b/drivers/iio/light/vcnl4000.c
index c9d85bbc9230..a17891511be5 100644
--- a/drivers/iio/light/vcnl4000.c
+++ b/drivers/iio/light/vcnl4000.c
@@ -56,7 +56,6 @@  static int vcnl4000_measure(struct vcnl4000_data *data, u8 req_mask,
 				u8 rdy_mask, u8 data_reg, int *val)
 {
 	int tries = 20;
-	__be16 buf;
 	int ret;
 
 	ret = i2c_smbus_write_byte_data(data->client, VCNL4000_COMMAND,
@@ -80,12 +79,11 @@  static int vcnl4000_measure(struct vcnl4000_data *data, u8 req_mask,
 		return -EIO;
 	}
 
-	ret = i2c_smbus_read_i2c_block_data(data->client,
-		data_reg, sizeof(buf), (u8 *) &buf);
+	ret = i2c_smbus_read_word_swapped(data->client, data_reg);
 	if (ret < 0)
 		return ret;
 
-	*val = be16_to_cpu(buf);
+	*val = ret;
 
 	return 0;
 }