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drm: Make the prime vmap/vunmap hooks optional. 

Some drivers leave these unimplemented, so don't make them have
unimplemented stubs.

Signed-off-by: Eric Anholt <eric@anholt.net>
Link: https://patchwork.freedesktop.org/patch/msgid/20180424004610.4637-2-eric@anholt.net
Reviewed-by: Daniel Vetter <daniel.vetter@ffwll.ch>
This commit is contained in:
Eric Anholt 2018-04-23 17:46:08 -07:00
parent 9f99963a43
commit d34deab907
1 changed files with 6 additions and 2 deletions
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8
drivers/gpu/drm/drm_prime.c
View File

@ -409,7 +409,10 @@ void *drm_gem_dmabuf_vmap(struct dma_buf *dma_buf)
struct drm_gem_object *obj = dma_buf->priv;
struct drm_device *dev = obj->dev;
return dev->driver->gem_prime_vmap(obj);
if (dev->driver->gem_prime_vmap)
return dev->driver->gem_prime_vmap(obj);
else
return NULL;
}
EXPORT_SYMBOL(drm_gem_dmabuf_vmap);
@ -426,7 +429,8 @@ void drm_gem_dmabuf_vunmap(struct dma_buf *dma_buf, void *vaddr)
struct drm_gem_object *obj = dma_buf->priv;
struct drm_device *dev = obj->dev;
dev->driver->gem_prime_vunmap(obj, vaddr);
if (dev->driver->gem_prime_vunmap)
dev->driver->gem_prime_vunmap(obj, vaddr);
}
EXPORT_SYMBOL(drm_gem_dmabuf_vunmap);