netdev - Re: [PATCH] rust: phy: use to_result for error handling

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Message-ID: <aKzp7sv-73BZGUqT@archiso>
Date: Mon, 25 Aug 2025 22:55:42 +0000
From: Elle Rhumsaa <elle@...thered-steel.dev>
To: Onur Özkan <work@...rozkan.dev>
Cc: rust-for-linux@...r.kernel.org, fujita.tomonori@...il.com,
	tmgross@...ch.edu, ojeda@...nel.org, alex.gaynor@...il.com,
	boqun.feng@...il.com, gary@...yguo.net, bjorn3_gh@...tonmail.com,
	lossin@...nel.org, a.hindborg@...nel.org, aliceryhl@...gle.com,
	dakr@...nel.org, netdev@...r.kernel.org,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH] rust: phy: use to_result for error handling

On Thu, Aug 21, 2025 at 12:12:35PM +0300, Onur Özkan wrote:
> Simplifies error handling by replacing the manual check
> of the return value with the `to_result` helper.
> 
> Signed-off-by: Onur Özkan <work@...rozkan.dev>
> ---
>  rust/kernel/net/phy.rs | 7 ++-----
>  1 file changed, 2 insertions(+), 5 deletions(-)
> 
> diff --git a/rust/kernel/net/phy.rs b/rust/kernel/net/phy.rs
> index 7de5cc7a0eee..c895582cd624 100644
> --- a/rust/kernel/net/phy.rs
> +++ b/rust/kernel/net/phy.rs
> @@ -196,11 +196,8 @@ pub fn read_paged(&mut self, page: u16, regnum: u16) -> Result<u16> {
>          // SAFETY: `phydev` is pointing to a valid object by the type invariant of `Self`.
>          // So it's just an FFI call.
>          let ret = unsafe { bindings::phy_read_paged(phydev, page.into(), regnum.into()) };
> -        if ret < 0 {
> -            Err(Error::from_errno(ret))
> -        } else {
> -            Ok(ret as u16)
> -        }
> +
> +        to_result(ret).map(|()| ret as u16)
>      }
> 
>      /// Resolves the advertisements into PHY settings.
> --
> 2.50.0

Reviewed-by: Elle Rhumsaa <elle@...thered-steel.dev>