On 05/29/2018 04:59 PM, Gerd Hoffmann wrote:
So drivers don't need dummy functions just returning NULL.
Cc: Daniel Vetter daniel@ffwll.ch Signed-off-by: Gerd Hoffmann kraxel@redhat.com
include/linux/dma-buf.h | 4 ++-- drivers/dma-buf/dma-buf.c | 4 ++++ 2 files changed, 6 insertions(+), 2 deletions(-)
diff --git a/include/linux/dma-buf.h b/include/linux/dma-buf.h index 085db2fee2..88917fa796 100644 --- a/include/linux/dma-buf.h +++ b/include/linux/dma-buf.h @@ -39,12 +39,12 @@ struct dma_buf_attachment;
/**
- struct dma_buf_ops - operations possible on struct dma_buf
- @map_atomic: maps a page from the buffer into kernel address
- @map_atomic: [optional] maps a page from the buffer into kernel address
space, users may not block until the subsequent unmap call.This callback must not sleep.- @unmap_atomic: [optional] unmaps a atomically mapped page from the buffer.
This Callback must not sleep.
- @map: maps a page from the buffer into kernel address space.
- @map: [optional] maps a page from the buffer into kernel address space.
- @unmap: [optional] unmaps a page from the buffer.
- @vmap: [optional] creates a virtual mapping for the buffer into kernel
address space. Same restrictions as for vmap and friends apply.diff --git a/drivers/dma-buf/dma-buf.c b/drivers/dma-buf/dma-buf.c index d78d5fc173..4c45e31258 100644 --- a/drivers/dma-buf/dma-buf.c +++ b/drivers/dma-buf/dma-buf.c @@ -872,6 +872,8 @@ void *dma_buf_kmap_atomic(struct dma_buf *dmabuf, unsigned long page_num) { WARN_ON(!dmabuf);
- if (!dmabuf->ops->map_atomic)
return NULL;@@ -907,6 +909,8 @@ void *dma_buf_kmap(struct dma_buf *dmabuf, unsigned long page_num) { WARN_ON(!dmabuf);
- if (!dmabuf->ops->map)
return NULL;
Reviewed-by: Oleksandr Andrushchenko oleksandr_andrushchenko@epam.com