On Fri, 10 Apr 2020 17:17:26 +0300
Alexandru Ardelean <alexandru.ardelean@xxxxxxxxxx> wrote:
> An IIO device will have multiple buffers, but it shouldn't be allowed that
> an IIO buffer should belong to more than 1 IIO device.
>
> Once things get moved more from IIO device to the IIO buffer, and an IIO
> device will be able to have more than 1 buffer attached, there will be a
> need for a back-ref to the IIO device [from the IIO buffer].
>
> This change adds that.
>
> Signed-off-by: Alexandru Ardelean <alexandru.ardelean@xxxxxxxxxx>
Much as I hate circular references, I can't see a way around this one...
> ---
> drivers/iio/industrialio-buffer.c | 2 ++
> include/linux/iio/buffer_impl.h | 3 +++
> 2 files changed, 5 insertions(+)
>
> diff --git a/drivers/iio/industrialio-buffer.c b/drivers/iio/industrialio-buffer.c
> index e6fa1a4e135d..f9ffc7762f6c 100644
> --- a/drivers/iio/industrialio-buffer.c
> +++ b/drivers/iio/industrialio-buffer.c
> @@ -1478,5 +1478,7 @@ void iio_device_attach_buffer(struct iio_dev *indio_dev,
> struct iio_buffer *buffer)
> {
> indio_dev->buffer = iio_buffer_get(buffer);
> +
> + indio_dev->buffer->indio_dev = indio_dev;
> }
> EXPORT_SYMBOL_GPL(iio_device_attach_buffer);
> diff --git a/include/linux/iio/buffer_impl.h b/include/linux/iio/buffer_impl.h
> index 1e7edf6bed96..8fb92250a190 100644
> --- a/include/linux/iio/buffer_impl.h
> +++ b/include/linux/iio/buffer_impl.h
> @@ -69,6 +69,9 @@ struct iio_buffer_access_funcs {
> * those writing new buffer implementations.
> */
> struct iio_buffer {
> + /** @indio_dev: IIO device to which this buffer belongs to. */
> + struct iio_dev *indio_dev;
> +
> /** @length: Number of datums in buffer. */
> unsigned int length;
>
