From f9a24d1ac9cb82baf5ec5efdb6580a9ce0bd5bfc Mon Sep 17 00:00:00 2001
From: Rob Clark <rob@ti.com>
Date: Fri, 16 Mar 2012 11:04:41 -0500
Subject: [PATCH] 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: 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 +++++++++++++++
1 file changed, 15 insertions(+)
diff --git a/include/linux/dma-buf.h b/include/linux/dma-buf.h
index 891457a86b30b..bc4203dc6e182 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);