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video: adf: memblock: map buffer for dma

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Change-Id: I4df13c8b45b57fd0594b5e7bf351a4da33a8cb11
Signed-off-by: Greg Hackmann <ghackmann@google.com>
This commit is contained in:
Greg Hackmann
2014-04-28 17:00:44 -07:00
parent 6cb247b4ad
commit 220471ac6b
1 changed files with 13 additions and 3 deletions
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16
drivers/video/adf/adf_memblock.c
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@@ -28,7 +28,7 @@ static struct sg_table *adf_memblock_map(struct dma_buf_attachment *attach,
unsigned long pfn = PFN_DOWN(pdata->base);
struct page *page = pfn_to_page(pfn);
struct sg_table *table;
int ret;
int nents, ret;
table = kzalloc(sizeof(*table), GFP_KERNEL);
if (!table)
@@ -36,12 +36,21 @@ static struct sg_table *adf_memblock_map(struct dma_buf_attachment *attach,
ret = sg_alloc_table(table, 1, GFP_KERNEL);
if (ret < 0)
goto err;
goto err_alloc;
sg_set_page(table->sgl, page, attach->dmabuf->size, 0);
nents = dma_map_sg(attach->dev, table->sgl, 1, direction);
if (!nents) {
ret = -EINVAL;
goto err_map;
}
return table;
err:
err_map:
sg_free_table(table);
err_alloc:
kfree(table);
return ERR_PTR(ret);
}
@@ -49,6 +58,7 @@ err:
static void adf_memblock_unmap(struct dma_buf_attachment *attach,
struct sg_table *table, enum dma_data_direction direction)
{
dma_unmap_sg(attach->dev, table->sgl, 1, direction);
sg_free_table(table);
}