From f9a24d1ac9cb82baf5ec5efdb6580a9ce0bd5bfc Mon Sep 17 00:00:00 2001 From: Rob Clark Date: Fri, 16 Mar 2012 11:04:41 -0500 Subject: 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 Reviewed-by: Dave Airlie Reviewed-by: Kyungmin Park Signed-off-by: Sumit Semwal --- include/linux/dma-buf.h | 15 +++++++++++++++ 1 file changed, 15 insertions(+) (limited to 'include/linux/dma-buf.h') diff --git a/include/linux/dma-buf.h b/include/linux/dma-buf.h index 891457a86b30..bc4203dc6e18 100644 --- a/include/linux/dma-buf.h +++ b/include/linux/dma-buf.h @@ -30,6 +30,7 @@ #include #include #include +#include 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); -- cgit v1.2.3-59-g8ed1b