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

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Date:   Sun, 13 Feb 2022 18:57:40 +0000
From:   Jonathan Cameron <jic23@...nel.org>
To:     Paul Cercueil <paul@...pouillou.net>
Cc:     Michael Hennerich <Michael.Hennerich@...log.com>,
        Lars-Peter Clausen <lars@...afoo.de>,
        Christian König <christian.koenig@....com>,
        Sumit Semwal <sumit.semwal@...aro.org>,
        Jonathan Corbet <corbet@....net>,
        Alexandru Ardelean <ardeleanalex@...il.com>,
        dri-devel@...ts.freedesktop.org, linaro-mm-sig@...ts.linaro.org,
        linux-doc@...r.kernel.org, linux-kernel@...r.kernel.org,
        linux-iio@...r.kernel.org
Subject: Re: [PATCH v2 01/12] iio: buffer-dma: Get rid of outgoing queue

On Mon,  7 Feb 2022 12:59:22 +0000
Paul Cercueil <paul@...pouillou.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@...pouillou.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(-)
>