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udmabuf: separate out creating/destroying scatter-table 

These are nice functions and can be re-used.

Signed-off-by: Gurchetan Singh <gurchetansingh@chromium.org>
Link: http://patchwork.freedesktop.org/patch/msgid/20191203013627.85991-3-gurchetansingh@chromium.org
Signed-off-by: Gerd Hoffmann <kraxel@redhat.com>
This commit is contained in:
Gurchetan Singh 2019-12-02 17:36:26 -08:00 committed by Gerd Hoffmann
parent c1bbed6689
commit 17a7ce2034
1 changed files with 19 additions and 7 deletions
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26
drivers/dma-buf/udmabuf.c
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@ -47,10 +47,10 @@ static int mmap_udmabuf(struct dma_buf *buf, struct vm_area_struct *vma)
return 0;
}
static struct sg_table *map_udmabuf(struct dma_buf_attachment *at,
enum dma_data_direction direction)
static struct sg_table *get_sg_table(struct device *dev, struct dma_buf *buf,
enum dma_data_direction direction)
{
struct udmabuf *ubuf = at->dmabuf->priv;
struct udmabuf *ubuf = buf->priv;
struct sg_table *sg;
int ret;
@ -62,7 +62,7 @@ static struct sg_table *map_udmabuf(struct dma_buf_attachment *at,
GFP_KERNEL);
if (ret < 0)
goto err;
if (!dma_map_sg(at->dev, sg->sgl, sg->nents, direction)) {
if (!dma_map_sg(dev, sg->sgl, sg->nents, direction)) {
ret = -EINVAL;
goto err;
}
@ -74,13 +74,25 @@ err:
return ERR_PTR(ret);
}
static void put_sg_table(struct device *dev, struct sg_table *sg,
enum dma_data_direction direction)
{
dma_unmap_sg(dev, sg->sgl, sg->nents, direction);
sg_free_table(sg);
kfree(sg);
}
static struct sg_table *map_udmabuf(struct dma_buf_attachment *at,
enum dma_data_direction direction)
{
return get_sg_table(at->dev, at->dmabuf, direction);
}
static void unmap_udmabuf(struct dma_buf_attachment *at,
struct sg_table *sg,
enum dma_data_direction direction)
{
dma_unmap_sg(at->dev, sg->sgl, sg->nents, direction);
sg_free_table(sg);
kfree(sg);
return put_sg_table(at->dev, sg, direction);
}
static void release_udmabuf(struct dma_buf *buf)