4.19-stable review patch. If anyone has any objections, please let me know.
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From: Matteo Martelli matteomartelli3@gmail.com
commit 8a3dcc970dc57b358c8db2702447bf0af4e0d83a upstream.
When the scale_type is IIO_VAL_INT_PLUS_MICRO or IIO_VAL_INT_PLUS_NANO the scale passed as argument is only applied to the fractional part of the value. Fix it by also multiplying the integer part by the scale provided.
Fixes: 48e44ce0f881 ("iio:inkern: Add function to read the processed value") Signed-off-by: Matteo Martelli matteomartelli3@gmail.com Link: https://patch.msgid.link/20240730-iio-fix-scale-v1-1-6246638c8daa@gmail.com Cc: Stable@vger.kernel.org Signed-off-by: Jonathan Cameron Jonathan.Cameron@huawei.com Signed-off-by: Greg Kroah-Hartman gregkh@linuxfoundation.org --- drivers/iio/inkern.c | 8 ++++---- 1 file changed, 4 insertions(+), 4 deletions(-)
--- a/drivers/iio/inkern.c +++ b/drivers/iio/inkern.c @@ -640,17 +640,17 @@ static int iio_convert_raw_to_processed_ break; case IIO_VAL_INT_PLUS_MICRO: if (scale_val2 < 0) - *processed = -raw64 * scale_val; + *processed = -raw64 * scale_val * scale; else - *processed = raw64 * scale_val; + *processed = raw64 * scale_val * scale; *processed += div_s64(raw64 * (s64)scale_val2 * scale, 1000000LL); break; case IIO_VAL_INT_PLUS_NANO: if (scale_val2 < 0) - *processed = -raw64 * scale_val; + *processed = -raw64 * scale_val * scale; else - *processed = raw64 * scale_val; + *processed = raw64 * scale_val * scale; *processed += div_s64(raw64 * (s64)scale_val2 * scale, 1000000000LL); break;