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    Subject[PATCH 3/5] rust: error: Add to_result() helper
    From: Wedson Almeida Filho <wedsonaf@gmail.com>

    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_kernel_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>
    Signed-off-by: Asahi Lina <lina@asahilina.net>
    ---
    rust/kernel/error.rs | 10 ++++++++++
    1 file changed, 10 insertions(+)

    diff --git a/rust/kernel/error.rs b/rust/kernel/error.rs
    index 3b439fdb405c..1e8371f28746 100644
    --- a/rust/kernel/error.rs
    +++ b/rust/kernel/error.rs
    @@ -167,3 +167,13 @@ impl From<core::convert::Infallible> for Error {
    /// it should still be modeled as returning a `Result` rather than
    /// just an [`Error`].
    pub type Result<T = ()> = core::result::Result<T, Error>;
    +
    +/// Converts an integer as returned by a C kernel function to an error if it's negative, and
    +/// `Ok(())` otherwise.
    +pub fn to_result(err: core::ffi::c_int) -> Result {
    + if err < 0 {
    + Err(Error::from_kernel_errno(err))
    + } else {
    + Ok(())
    + }
    +}
    --
    2.35.1

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