dma-buf: add get_dma_buf() (f9a24d1a) · Commits · 戴 / test

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> Reviewed-by:

Dave Airlie <airlied@redhat.com> Reviewed-by:

Kyungmin Park <kyungmin.park@samsung.com> Signed-off-by:

Sumit Semwal <sumit.semwal@linaro.org>

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);

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