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iio: imu: adis16400: Fix sign extension

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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@rasmusvillemoes.dk>
Acked-by: Lars-Peter Clausen <lars@metafoo.de>
Cc: Stable@vger.kernel.org
Signed-off-by: Jonathan Cameron <jic23@kernel.org>
This commit is contained in:
Rasmus Villemoes 2015-01-23 00:34:02 +01:00 • committed by Jonathan Cameron
parent f7067a5ad7
commit 19e353f2b3
1 changed files with 2 additions and 1 deletions
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3
drivers/iio/imu/adis16400_core.c
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@ -26,6 +26,7 @@
#include <linux/list.h> #include <linux/list.h>
#include <linux/module.h> #include <linux/module.h>
#include <linux/debugfs.h> #include <linux/debugfs.h>
#include <linux/bitops.h>
#include <linux/iio/iio.h> #include <linux/iio/iio.h>
#include <linux/iio/sysfs.h> #include <linux/iio/sysfs.h>
@ -414,7 +415,7 @@ static int adis16400_read_raw(struct iio_dev *indio_dev,
mutex_unlock(&indio_dev->mlock); mutex_unlock(&indio_dev->mlock);
if (ret) if (ret)
return ret; return ret;
val16 = ((val16 & 0xFFF) << 4) >> 4; val16 = sign_extend32(val16, 11);
*val = val16; *val = val16;
return IIO_VAL_INT; return IIO_VAL_INT;
case IIO_CHAN_INFO_OFFSET: case IIO_CHAN_INFO_OFFSET: