| Message ID | 1331928144-30628-1-git-send-email-rob.clark@linaro.org |
|---|---|
| State | Accepted |
| Commit | f9a24d1ac9cb82baf5ec5efdb6580a9ce0bd5bfc |
| Headers | show |
Reviewed-by: Kyungmin Park <kyungmin.park@samsung.com> On 3/17/12, Rob Clark <rob.clark@linaro.org> wrote: > From: Rob Clark <rob@ti.com> > > 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> > --- > 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 > > > _______________________________________________ > Linaro-mm-sig mailing list > Linaro-mm-sig@lists.linaro.org > http://lists.linaro.org/mailman/listinfo/linaro-mm-sig >
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);