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The dmabuf iterator traverses the list of all DMA buffers. DMA buffers are refcounted through their associated struct file. A reference is taken on each buffer as the list is iterated to ensure each buffer persists for the duration of the bpf program execution without holding the list mutex. Signed-off-by: T.J. Mercier <tjmercier@google.com> Reviewed-by: Christian König <christian.koenig@amd.com> Acked-by: Song Liu <song@kernel.org> Link: https://lore.kernel.org/r/20250522230429.941193-3-tjmercier@google.com Signed-off-by: Alexei Starovoitov <ast@kernel.org>