rust: error: Add to_result() helper
Add a to_result() helper to convert kernel C return values to a Rust Result, mapping >=0 values to Ok(()) and negative values to Err(...), with Error::from_errno() ensuring that the errno is within range. Lina: Imported from rust-for-linux/rust, originally developed by Wedson as part of the AMBA device driver support. Signed-off-by:Wedson Almeida Filho <wedsonaf@gmail.com> Reviewed-by:
Andreas Hindborg <a.hindborg@samsung.com> Reviewed-by:
Gary Guo <gary@garyguo.net> Reviewed-by:
Martin Rodriguez Reboredo <yakoyoku@gmail.com> Signed-off-by:
Asahi Lina <lina@asahilina.net> Link: https://lore.kernel.org/r/20230224-rust-error-v3-4-03779bddc02b@asahilina.net [ Add a removal of `#[allow(dead_code)]`. ] Signed-off-by:
Miguel Ojeda <ojeda@kernel.org>
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