linux-kernel - [PATCH 3.2 017/221] iio: imu: adis16400: Fix sign extension

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Date:	Tue, 05 May 2015 02:16:39 +0100
From:	Ben Hutchings <ben@...adent.org.uk>
To:	linux-kernel@...r.kernel.org, stable@...r.kernel.org
CC:	akpm@...ux-foundation.org, "Lars-Peter Clausen" <lars@...afoo.de>,
	"Jonathan Cameron" <jic23@...nel.org>,
	"Rasmus Villemoes" <linux@...musvillemoes.dk>
Subject: [PATCH 3.2 017/221] iio: imu: adis16400: Fix sign extension

3.2.69-rc1 review patch.  If anyone has any objections, please let me know.

------------------

From: Rasmus Villemoes <linux@...musvillemoes.dk>

commit 19e353f2b344ad86cea6ebbc0002e5f903480a90 upstream.

The intention is obviously to sign-extend a 12 bit quantity. But
because of C's promotion rules, the assignment is equivalent to "val16
&= 0xfff;". Use the proper API for this.

Signed-off-by: Rasmus Villemoes <linux@...musvillemoes.dk>
Acked-by: Lars-Peter Clausen <lars@...afoo.de>
Signed-off-by: Jonathan Cameron <jic23@...nel.org>
[bwh: Backported to 3.2: adjust filename, context]
Signed-off-by: Ben Hutchings <ben@...adent.org.uk>
---
 drivers/staging/iio/imu/adis16400_core.c | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

--- a/drivers/staging/iio/imu/adis16400_core.c
+++ b/drivers/staging/iio/imu/adis16400_core.c
@@ -25,6 +25,7 @@
 #include <linux/sysfs.h>
 #include <linux/list.h>
 #include <linux/module.h>
+#include <linux/bitops.h>
 
 #include "../iio.h"
 #include "../sysfs.h"
@@ -541,7 +542,7 @@ static int adis16400_read_raw(struct iio
 		mutex_unlock(&indio_dev->mlock);
 		if (ret)
 			return ret;
-		val16 = ((val16 & 0xFFF) << 4) >> 4;
+		val16 = sign_extend32(val16, 11);
 		*val = val16;
 		return IIO_VAL_INT;
 	case (1 << IIO_CHAN_INFO_OFFSET_SEPARATE):

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