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Commit f9a24d1a authored by Rob Clark's avatar Rob Clark Committed by Sumit Semwal
Browse files

dma-buf: add get_dma_buf() 



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: default avatarRob Clark <rob@ti.com>
Reviewed-by: default avatarDave Airlie <airlied@redhat.com>
Reviewed-by: default avatarKyungmin Park <kyungmin.park@samsung.com>
Signed-off-by: default avatarSumit Semwal <sumit.semwal@linaro.org>
parent 55c1c4ca

include/linux/dma-buf.h

+15 −0
Original line number Diff line number Diff line
@@ -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);