iio: adc: ad_sigma_delta: don't overallocate scan buffer

Fix overallocating the size of the scan buffer by converting bits to
bytes. The size is meant to be in bytes, so scanbits needs to be
divided by 8.

Signed-off-by: David Lechner <dlechner@baylibre.com>
Reviewed-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
Reviewed-by: Nuno Sá <nuno.sa@analog.com>
Link: https://patch.msgid.link/20250701-iio-adc-ad7173-add-spi-offload-support-v3-1-42abb83e3dac@baylibre.com
Signed-off-by: Jonathan Cameron <Jonathan.Cameron@huawei.com>

diff --git a/drivers/iio/adc/ad_sigma_delta.c b/drivers/iio/adc/ad_sigma_delta.c
index 4c5f8d29a559fea7226b84141bcb148fb801f62c..6b3ef7ef403e00804abeb81025ed293b188e492b 100644 (file)
--- a/drivers/iio/adc/ad_sigma_delta.c
+++ b/drivers/iio/adc/ad_sigma_delta.c
@@ -489,7 +489,7 @@ static int ad_sd_buffer_postenable(struct iio_dev *indio_dev)
                        return ret;
        }
 
-       samples_buf_size = ALIGN(slot * indio_dev->channels[0].scan_type.storagebits, 8);
+       samples_buf_size = ALIGN(slot * indio_dev->channels[0].scan_type.storagebits / 8, 8);
        samples_buf_size += sizeof(int64_t);
        samples_buf = devm_krealloc(&sigma_delta->spi->dev, sigma_delta->samples_buf,
                                    samples_buf_size, GFP_KERNEL);