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comp: host: make sure we have enough data to copy to/from host 

Perform a check in the copy() function to make sure there is enough
data to copy to/from host buffers.

Signed-off-by: Liam Girdwood <liam.r.girdwood@linux.intel.com>
This commit is contained in:
Liam Girdwood 2017-08-23 23:52:00 +01:00
parent c73ff5c16d
commit a68343fee8
1 changed files with 18 additions and 0 deletions
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18
src/audio/host.c
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@ -636,12 +636,30 @@ static int host_reset(struct comp_dev *dev)
static int host_copy(struct comp_dev *dev)
{
struct host_data *hd = comp_get_drvdata(dev);
struct comp_buffer *dma_buffer;
struct dma_sg_elem *local_elem;
tracev_host("cpy");
if (dev->state != COMP_STATE_RUNNING)
return 0;
local_elem = list_first_item(&hd->config.elem_list,
struct dma_sg_elem, list);
/* enough free or avail to copy ? */
if (dev->params.direction == SOF_IPC_STREAM_PLAYBACK) {
dma_buffer = list_first_item(&dev->bsink_list,
struct comp_buffer, source_list);
if (dma_buffer->free < local_elem->size)
return 0;
} else {
dma_buffer = list_first_item(&dev->bsource_list,
struct comp_buffer, sink_list);
if (dma_buffer->avail < local_elem->size)
return 0;
}
/* do DMA transfer */
dma_set_config(hd->dma, hd->chan, &hd->config);
dma_start(hd->dma, hd->chan);