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| author | Gerd Hoffmann <kraxel@redhat.com> | 2018-05-29 15:59:18 +0200 |
|---|---|---|
| committer | Gerd Hoffmann <kraxel@redhat.com> | 2018-06-01 08:59:35 +0200 |
| commit | 09ea0dfbf972c63dfea8cf46f2fb67f39e4d833b (patch) | |
| tree | 33c731ecd3febc843c2eaefd2c33002d336e925a /drivers/dma-buf | |
| parent | e065a8dd30af703b4794dc740c0825ee12b92efd (diff) | |
| download | lwn-09ea0dfbf972c63dfea8cf46f2fb67f39e4d833b.tar.gz lwn-09ea0dfbf972c63dfea8cf46f2fb67f39e4d833b.zip | |
dma-buf: make map_atomic and map function pointers optional
So drivers don't need dummy functions just returning NULL.
Cc: Daniel Vetter <daniel@ffwll.ch>
Signed-off-by: Gerd Hoffmann <kraxel@redhat.com>
Reviewed-by: Daniel Vetter <daniel.vetter@ffwll.ch>
Reviewed-by: Oleksandr Andrushchenko <oleksandr_andrushchenko@epam.com>
Link: http://patchwork.freedesktop.org/patch/msgid/20180529135918.19729-1-kraxel@redhat.com
Diffstat (limited to 'drivers/dma-buf')
| -rw-r--r-- | drivers/dma-buf/dma-buf.c | 4 |
1 files changed, 4 insertions, 0 deletions
diff --git a/drivers/dma-buf/dma-buf.c b/drivers/dma-buf/dma-buf.c index d78d5fc173dc..4c45e31258f0 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; return dmabuf->ops->map_atomic(dmabuf, page_num); } EXPORT_SYMBOL_GPL(dma_buf_kmap_atomic); @@ -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; return dmabuf->ops->map(dmabuf, page_num); } EXPORT_SYMBOL_GPL(dma_buf_kmap); |