iio: accel: bma180: use stack allocated buffer for scan

Move the scan struct to the stack instead of being in the driver state
struct. The buffer is only used in a single function and does not need
to be DMA-safe so it does not need to exist outside of that function's
scope.

Signed-off-by: David Lechner <dlechner@baylibre.com>
Reviewed-by: Nuno Sá <nuno.sa@analog.com>
Link: https://patch.msgid.link/20250721-iio-use-more-iio_declare_buffer_with_ts-v2-1-f8fb11b8add8@baylibre.com
Signed-off-by: Jonathan Cameron <Jonathan.Cameron@huawei.com>

diff --git a/drivers/iio/accel/bma180.c b/drivers/iio/accel/bma180.c
index 4fccbcb76e0423bee37463a72c637af80e356a19..8925f5279e627a67c8e2928b10bee04185663e10 100644 (file)
--- a/drivers/iio/accel/bma180.c
+++ b/drivers/iio/accel/bma180.c
@@ -139,11 +139,6 @@ struct bma180_data {
        int scale;
        int bw;
        bool pmode;
-       /* Ensure timestamp is naturally aligned */
-       struct {
-               s16 chan[4];
-               aligned_s64 timestamp;
-       } scan;
 };
 
 enum bma180_chan {
@@ -870,6 +865,10 @@ static irqreturn_t bma180_trigger_handler(int irq, void *p)
        struct bma180_data *data = iio_priv(indio_dev);
        s64 time_ns = iio_get_time_ns(indio_dev);
        int bit, ret, i = 0;
+       struct {
+               s16 chan[4];
+               aligned_s64 timestamp;
+       } scan = { };
 
        mutex_lock(&data->mutex);
 
@@ -879,12 +878,12 @@ static irqreturn_t bma180_trigger_handler(int irq, void *p)
                        mutex_unlock(&data->mutex);
                        goto err;
                }
-               data->scan.chan[i++] = ret;
+               scan.chan[i++] = ret;
        }
 
        mutex_unlock(&data->mutex);
 
-       iio_push_to_buffers_with_ts(indio_dev, &data->scan, sizeof(data->scan), time_ns);
+       iio_push_to_buffers_with_ts(indio_dev, &scan, sizeof(scan), time_ns);
 err:
        iio_trigger_notify_done(indio_dev->trig);