This is a note to let you know that I've just added the patch titled
iio: afe: rescale: use s64 for temporary scale calculations
to my char-misc git tree which can be found at git://git.kernel.org/pub/scm/linux/kernel/git/gregkh/char-misc.git in the char-misc-next branch.
The patch will show up in the next release of the linux-next tree (usually sometime within the next 24 hours during the week.)
The patch will also be merged in the next major kernel release during the merge window.
If you have any questions about this process, please let me know.
From 51593106b608ae4247cc8da928813347da16d025 Mon Sep 17 00:00:00 2001 From: Liam Beguin liambeguin@gmail.com Date: Sat, 8 Jan 2022 15:53:07 -0500 Subject: iio: afe: rescale: use s64 for temporary scale calculations
All four scaling coefficients can take signed values. Make tmp a signed 64-bit integer and switch to div_s64() to preserve signs during 64-bit divisions.
Fixes: 8b74816b5a9a ("iio: afe: rescale: new driver") Signed-off-by: Liam Beguin liambeguin@gmail.com Reviewed-by: Peter Rosin peda@axentia.se Reviewed-by: Andy Shevchenko andy.shevchenko@gmail.com Link: https://lore.kernel.org/r/20220108205319.2046348-5-liambeguin@gmail.com Cc: Stable@vger.kernel.org Signed-off-by: Jonathan Cameron Jonathan.Cameron@huawei.com --- drivers/iio/afe/iio-rescale.c | 8 ++++---- 1 file changed, 4 insertions(+), 4 deletions(-)
diff --git a/drivers/iio/afe/iio-rescale.c b/drivers/iio/afe/iio-rescale.c index 774eb3044edd..271d73e420c4 100644 --- a/drivers/iio/afe/iio-rescale.c +++ b/drivers/iio/afe/iio-rescale.c @@ -39,7 +39,7 @@ static int rescale_read_raw(struct iio_dev *indio_dev, int *val, int *val2, long mask) { struct rescale *rescale = iio_priv(indio_dev); - unsigned long long tmp; + s64 tmp; int ret;
switch (mask) { @@ -77,10 +77,10 @@ static int rescale_read_raw(struct iio_dev *indio_dev, *val2 = rescale->denominator; return IIO_VAL_FRACTIONAL; case IIO_VAL_FRACTIONAL_LOG2: - tmp = *val * 1000000000LL; - do_div(tmp, rescale->denominator); + tmp = (s64)*val * 1000000000LL; + tmp = div_s64(tmp, rescale->denominator); tmp *= rescale->numerator; - do_div(tmp, 1000000000LL); + tmp = div_s64(tmp, 1000000000LL); *val = tmp; return ret; default: