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iio: buffer-dmaengine: adjust `bytes_used` with residue info 

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>
This commit is contained in:
Alexandru Ardelean 2020-08-26 07:20:11 +02:00 committed by Jonathan Cameron
parent e7b61fc4ca
commit 65e02d0b50
1 changed files with 4 additions and 2 deletions
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6
drivers/iio/buffer/industrialio-buffer-dmaengine.c
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@ -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);