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Timur Tabi
69bfce0f25
Add UserSliceWriter::write_dma() to copy data from a Coherent<[u8]> to userspace. This provides a safe interface for copying DMA buffer contents to userspace without requiring callers to work with raw pointers. Because write_dma() and write_slice() have common code, factor that code out into a helper function, write_raw(). The method handles bounds checking and offset calculation internally, wrapping the unsafe copy_to_user() call. Signed-off-by: Timur Tabi <ttabi@nvidia.com> Reviewed-by: Alexandre Courbot <acourbot@nvidia.com> Acked-by: Miguel Ojeda <ojeda@kernel.org> Tested-by: John Hubbard <jhubbard@nvidia.com> Tested-by: Eliot Courtney <ecourtney@nvidia.com> Reviewed-by: Alice Ryhl <aliceryhl@google.com> Link: https://patch.msgid.link/20260319212658.2541610-3-ttabi@nvidia.com [ Rebase onto Coherent<T> changes; remove unnecessary turbofish from cast(). - Danilo ] Signed-off-by: Danilo Krummrich <dakr@kernel.org>