linux-kernel - [PATCH 3/5] rust: error: Add to

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Date:   Fri, 24 Feb 2023 17:50:21 +0900
From:   Asahi Lina <lina@...hilina.net>
To:     Miguel Ojeda <ojeda@...nel.org>,
        Alex Gaynor <alex.gaynor@...il.com>,
        Wedson Almeida Filho <wedsonaf@...il.com>,
        Boqun Feng <boqun.feng@...il.com>, Gary Guo <gary@...yguo.net>,
        Björn Roy Baron <bjorn3_gh@...tonmail.com>,
        Sven Van Asbroeck <thesven73@...il.com>
Cc:     Fox Chen <foxhlchen@...il.com>, rust-for-linux@...r.kernel.org,
        linux-kernel@...r.kernel.org, asahi@...ts.linux.dev,
        Asahi Lina <lina@...hilina.net>
Subject: [PATCH 3/5] rust: error: Add to_result() helper

From: Wedson Almeida Filho <wedsonaf@...il.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@...il.com>
Signed-off-by: Asahi Lina <lina@...hilina.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