Messages in this thread Patch in this message | | | From | Asahi Lina <> | Date | Fri, 24 Feb 2023 17:50:21 +0900 | Subject | [PATCH 3/5] rust: error: Add to_result() helper |
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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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