iio: buffer-dmaengine: adjust `bytes_used` with residue info (65e02d0b) · Commits · 戴 / test

A transfer may fall shorter than the bytes in the block. This information is available in the residue from the DMA engine, so we can compute actual `bytes_used` with that by subtracting the residue. Signed-off-by:

Alexandru Ardelean <alexandru.ardelean@analog.com> Signed-off-by:

Lars-Peter Clausen <lars@metafoo.de> Link: https://lore.kernel.org/r/20200826052011.13348-1-lars@metafoo.de Signed-off-by:

Jonathan Cameron <Jonathan.Cameron@huawei.com>

drivers/iio/buffer/industrialio-buffer-dmaengine.c

+4 −2

Original line number	Diff line number	Diff line
		@@ -45,7 +45,8 @@ static struct dmaengine_buffer *iio_buffer_to_dmaengine_buffer(
		return container_of(buffer, struct dmaengine_buffer, queue.buffer);
		}

		static void iio_dmaengine_buffer_block_done(void *data)
		static void iio_dmaengine_buffer_block_done(void *data,
		const struct dmaengine_result *result)
		{
		struct iio_dma_buffer_block *block = data;
		unsigned long flags;
		@@ -53,6 +54,7 @@ static void iio_dmaengine_buffer_block_done(void *data)
		spin_lock_irqsave(&block->queue->list_lock, flags);
		list_del(&block->head);
		spin_unlock_irqrestore(&block->queue->list_lock, flags);
		block->bytes_used -= result->residue;
		iio_dma_buffer_block_done(block);
		}

		@@ -74,7 +76,7 @@ static int iio_dmaengine_buffer_submit_block(struct iio_dma_buffer_queue *queue,
		if (!desc)
		return -ENOMEM;

		desc->callback = iio_dmaengine_buffer_block_done;
		desc->callback_result = iio_dmaengine_buffer_block_done;
		desc->callback_param = block;

		cookie = dmaengine_submit(desc);

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