From: Rob Clark <rob@xxxxxx>
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@xxxxxx>
---
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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