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(-)