dma-buf: Move dma_buf_vmap() to dynamic locking specification

Move dma_buf_vmap/vunmap() functions to the dynamic locking
specification by asserting that the reservation lock is held.

Acked-by: Sumit Semwal <[email protected]>
Acked-by: Christian König <[email protected]>
Signed-off-by: Dmitry Osipenko <[email protected]>
Link: https://patchwork.freedesktop.org/patch/msgid/[email protected]

Author: digetx

drivers/dma-buf/dma-buf.c

@@ -1450,6 +1450,8 @@ int dma_buf_vmap(struct dma_buf *dmabuf, struct iosys_map *map)
 	if (WARN_ON(!dmabuf))
 		return -EINVAL;
 
+	dma_resv_assert_held(dmabuf->resv);
+
 	if (!dmabuf->ops->vmap)
 		return -EINVAL;
 
@@ -1515,6 +1517,8 @@ void dma_buf_vunmap(struct dma_buf *dmabuf, struct iosys_map *map)
 	if (WARN_ON(!dmabuf))
 		return;
 
+	dma_resv_assert_held(dmabuf->resv);
+
 	BUG_ON(iosys_map_is_null(&dmabuf->vmap_ptr));
 	BUG_ON(dmabuf->vmapping_counter == 0);
 	BUG_ON(!iosys_map_is_equal(&dmabuf->vmap_ptr, map));