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iio: buffer: ensure repeat alignment is a power of two

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Use roundup_pow_of_two() in the calculation of iio_storage_bytes_for_si()
when scan_type->repeat > 1 to ensure that the size is a power of two.
storagebits is always going to be a power of two bytes, so we only need
to apply this to the repeat factor. The storage size is also used for
alignment, and we want to ensure that all alignments are a power of two.

The only repeat in use in the kernel currently is for quaternions, which
have a repeat of 4, so this does not change the result for existing
users.

Signed-off-by: David Lechner <dlechner@baylibre.com>
Reviewed-by: Nuno Sá <nuno.sa@analog.com>
Signed-off-by: Jonathan Cameron <Jonathan.Cameron@huawei.com>
This commit is contained in:
David Lechner 2026-03-07 19:44:12 -06:00 committed by Jonathan Cameron
parent cb27d8c18f
commit 9957725014
1 changed files with 1 additions and 1 deletions
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2
drivers/iio/industrialio-buffer.c
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@ -750,7 +750,7 @@ static int iio_storage_bytes_for_si(struct iio_dev *indio_dev,
bytes = scan_type->storagebits / 8;
if (scan_type->repeat > 1)
bytes *= scan_type->repeat;
bytes *= roundup_pow_of_two(scan_type->repeat);
return bytes;
}