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authorGurchetan Singh <gurchetansingh@chromium.org>2019-12-03 04:36:26 +0300
committerGerd Hoffmann <kraxel@redhat.com>2019-12-05 10:57:45 +0300
commit17a7ce203490459cff14fb1c8f9a15d65fd1c544 (patch)
tree075675993c6e66c8f411a552f1f4b75f40a876f5 /drivers/dma-buf
parentc1bbed668997268c9edccdc9db1bd1487d9e20b0 (diff)
downloadlinux-17a7ce203490459cff14fb1c8f9a15d65fd1c544.tar.xz
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>
Diffstat (limited to 'drivers/dma-buf')
-rw-r--r--drivers/dma-buf/udmabuf.c26
1 files changed, 19 insertions, 7 deletions
diff --git a/drivers/dma-buf/udmabuf.c b/drivers/dma-buf/udmabuf.c
index f0bf3ba7441e..0a610e09ae23 100644
--- a/drivers/dma-buf/udmabuf.c
+++ b/drivers/dma-buf/udmabuf.c
@@ -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)