linux-kernel - [PATCH 5.15 143/171] iio: gyro: adxrs290: fix data signedness

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Date:   Mon, 13 Dec 2021 10:30:58 +0100
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     linux-kernel@...r.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        stable@...r.kernel.org,
        Kister Genesis Jimenez <kister.jimenez@...log.com>,
        Nuno Sá <nuno.sa@...log.com>,
        Andy Shevchenko <andy.shevchenko@...il.com>,
        Stable@...r.kernel.org,
        Jonathan Cameron <Jonathan.Cameron@...wei.com>
Subject: [PATCH 5.15 143/171] iio: gyro: adxrs290: fix data signedness

From: Kister Genesis Jimenez <kister.jimenez@...log.com>

commit fde272e78e004a45c7e4976876277d7e6a5a0ede upstream.

Properly sign-extend the rate and temperature data.

Fixes: 2c8920fff1457 ("iio: gyro: Add driver support for ADXRS290")
Signed-off-by: Kister Genesis Jimenez <kister.jimenez@...log.com>
Signed-off-by: Nuno Sá <nuno.sa@...log.com>
Reviewed-by: Andy Shevchenko <andy.shevchenko@...il.com>
Link: https://lore.kernel.org/r/20211115104147.18669-1-nuno.sa@analog.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/gyro/adxrs290.c |    5 +++--
 1 file changed, 3 insertions(+), 2 deletions(-)

--- a/drivers/iio/gyro/adxrs290.c
+++ b/drivers/iio/gyro/adxrs290.c
@@ -7,6 +7,7 @@
  */
 
 #include <linux/bitfield.h>
+#include <linux/bitops.h>
 #include <linux/delay.h>
 #include <linux/device.h>
 #include <linux/kernel.h>
@@ -124,7 +125,7 @@ static int adxrs290_get_rate_data(struct
 		goto err_unlock;
 	}
 
-	*val = temp;
+	*val = sign_extend32(temp, 15);
 
 err_unlock:
 	mutex_unlock(&st->lock);
@@ -146,7 +147,7 @@ static int adxrs290_get_temp_data(struct
 	}
 
 	/* extract lower 12 bits temperature reading */
-	*val = temp & 0x0FFF;
+	*val = sign_extend32(temp, 11);
 
 err_unlock:
 	mutex_unlock(&st->lock);