Reviewed-by: Kyungmin Park kyungmin.park@samsung.com

On 3/17/12, Rob Clark rob.clark@linaro.org wrote:

From: Rob Clark rob@ti.com

Works in a similar way to get_file(), and is needed in cases such as when the exporter needs to also keep a reference to the dmabuf (that is later released with a dma_buf_put()), and possibly other similar cases.

Signed-off-by: Rob Clark rob@ti.com

Minor update on original to add a missing #include

include/linux/dma-buf.h | 15 +++++++++++++++ 1 files changed, 15 insertions(+), 0 deletions(-)

diff --git a/include/linux/dma-buf.h b/include/linux/dma-buf.h index 891457a..bc4203dc 100644 --- a/include/linux/dma-buf.h +++ b/include/linux/dma-buf.h @@ -30,6 +30,7 @@ #include <linux/scatterlist.h> #include <linux/list.h> #include <linux/dma-mapping.h> +#include <linux/fs.h>

struct dma_buf; struct dma_buf_attachment; @@ -110,6 +111,20 @@ struct dma_buf_attachment { void *priv; };

+/**

• • get_dma_buf - convenience wrapper for get_file.
• • @dmabuf: [in] pointer to dma_buf
• • Increments the reference count on the dma-buf, needed in case of drivers
• • that either need to create additional references to the dmabuf on the
• • kernel side. For example, an exporter that needs to keep a dmabuf ptr
• • so that subsequent exports don't create a new dmabuf.
• */

+static inline void get_dma_buf(struct dma_buf *dmabuf) +{

• get_file(dmabuf->file);

+}

#ifdef CONFIG_DMA_SHARED_BUFFER struct dma_buf_attachment *dma_buf_attach(struct dma_buf *dmabuf, struct device *dev); -- 1.7.5.4

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