linux-kernel - [PATCH 4.19 11/25] iio: vcnl4000: Fix i2c swapped word reading.

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Message-Id: <20200609174049.916148213@linuxfoundation.org>
Date:   Tue,  9 Jun 2020 19:45:01 +0200
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     linux-kernel@...r.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        stable@...r.kernel.org, Mathieu Othacehe <m.othacehe@...il.com>,
        Stable@...r.kernel.org,
        Jonathan Cameron <Jonathan.Cameron@...wei.com>
Subject: [PATCH 4.19 11/25] iio: vcnl4000: Fix i2c swapped word reading.

From: Mathieu Othacehe <m.othacehe@...il.com>

commit 18dfb5326370991c81a6d1ed6d1aeee055cb8c05 upstream.

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@...il.com>
Cc: <Stable@...r.kernel.org>
Signed-off-by: Jonathan Cameron <Jonathan.Cameron@...wei.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>

---
 drivers/iio/light/vcnl4000.c |    6 ++----
 1 file changed, 2 insertions(+), 4 deletions(-)

--- a/drivers/iio/light/vcnl4000.c
+++ b/drivers/iio/light/vcnl4000.c
@@ -166,7 +166,6 @@ static int vcnl4000_measure(struct vcnl4
 				u8 rdy_mask, u8 data_reg, int *val)
 {
 	int tries = 20;
-	__be16 buf;
 	int ret;
 
 	mutex_lock(&data->vcnl4000_lock);
@@ -193,13 +192,12 @@ static int vcnl4000_measure(struct vcnl4
 		goto fail;
 	}
 
-	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)
 		goto fail;
 
 	mutex_unlock(&data->vcnl4000_lock);
-	*val = be16_to_cpu(buf);
+	*val = ret;
 
 	return 0;