Re: [PATCH v2 01/12] iio: buffer-dma: Get rid of outgoing queue

Jonathan Cameron
2022-02-13T18:51:08Z

On Mon, 7 Feb 2022 12:59:22 +0000
Paul Cercueil <paul@crapouillou.net> wrote:

> The buffer-dma code was using two queues, incoming and outgoing, to
> manage the state of the blocks in use.
>
> While this totally works, it adds some complexity to the code,
> especially since the code only manages 2 blocks. It is much easier to
> just check each block's state manually, and keep a counter for the next
> block to dequeue.
>
> Since the new DMABUF based API wouldn't use the outgoing queue anyway,
> getting rid of it now makes the upcoming changes simpler.
>
> With this change, the IIO_BLOCK_STATE_DEQUEUED is now useless, and can
> be removed.
>
> v2: - Only remove the outgoing queue, and keep the incoming queue, as we
> want the buffer to start streaming data as soon as it is enabled.
> - Remove IIO_BLOCK_STATE_DEQUEUED, since it is now functionally the
> same as IIO_BLOCK_STATE_DONE.
>
> Signed-off-by: Paul Cercueil <paul@crapouillou.net>
> ---

Trivial process thing but change log should be here, not above as we don't
want it to end up in the main git log.

> drivers/iio/buffer/industrialio-buffer-dma.c | 44 ++++++++++----------
> include/linux/iio/buffer-dma.h | 7 ++--
> 2 files changed, 26 insertions(+), 25 deletions(-)
>