[PATCH] Documentation/dma-buf-sharing.txt: update API descriptions
gioh.kim at lge.com
Mon May 12 04:48:12 PDT 2014
From: "gioh.kim" <gioh.kim at lge.com>
update some descriptions for API arguments and descriptions.
Signed-off-by: Gioh Kim <gioh.kim at lge.com>
Documentation/dma-buf-sharing.txt | 10 ++++++----
1 file changed, 6 insertions(+), 4 deletions(-)
diff --git a/Documentation/dma-buf-sharing.txt b/Documentation/dma-buf-sharing.txt
index 505e711..1ea89b8 100644
@@ -56,7 +56,7 @@ The dma_buf buffer sharing API usage contains the following steps:
size_t size, int flags,
const char *exp_name)
- If this succeeds, dma_buf_export allocates a dma_buf structure, and returns a
+ If this succeeds, dma_buf_export_named allocates a dma_buf structure, and returns a
pointer to the same. It also associates an anonymous file with this buffer,
so it can be exported. On failure to allocate the dma_buf object, it returns
@@ -66,7 +66,7 @@ The dma_buf buffer sharing API usage contains the following steps:
Exporting modules which do not wish to provide any specific name may use the
helper define 'dma_buf_export()', with the same arguments as above, but
- without the last argument; a __FILE__ pre-processor directive will be
+ without the last argument; a KBUILD_MODNAME pre-processor directive will be
inserted in place of 'exp_name' instead.
2. Userspace gets a handle to pass around to potential buffer-users
@@ -76,7 +76,7 @@ The dma_buf buffer sharing API usage contains the following steps:
drivers and/or processes.
- int dma_buf_fd(struct dma_buf *dmabuf)
+ int dma_buf_fd(struct dma_buf *dmabuf, int flags)
This API installs an fd for the anonymous file associated with this buffer;
returns either 'fd', or error.
@@ -157,7 +157,9 @@ to request use of buffer for allocation.
"dma_buf->ops->" indirection from the users of this interface.
In struct dma_buf_ops, unmap_dma_buf is defined as
- void (*unmap_dma_buf)(struct dma_buf_attachment *, struct sg_table *);
+ void (*unmap_dma_buf)(struct dma_buf_attachment *,
+ struct sg_table *,
+ enum dma_data_direction);
unmap_dma_buf signifies the end-of-DMA for the attachment provided. Like
map_dma_buf, this API also must be implemented by the exporter.
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