linux-kernel - Re: [PATCH v3 02/12] rust: error: improve unsafe code in example

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Date: Wed, 31 Jan 2024 21:23:48 -0500
From: Trevor Gross <tmgross@...ch.edu>
To: kernel@...entinobst.de
Cc: 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>, 
	Benno Lossin <benno.lossin@...ton.me>, Andreas Hindborg <a.hindborg@...sung.com>, 
	Alice Ryhl <aliceryhl@...gle.com>, rust-for-linux@...r.kernel.org, 
	linux-kernel@...r.kernel.org, Martin Rodriguez Reboredo <yakoyoku@...il.com>
Subject: Re: [PATCH v3 02/12] rust: error: improve unsafe code in example

On Wed, Jan 31, 2024 at 3:24 PM Valentin Obst via B4 Relay
<devnull+kernel.valentinobst.de@...nel.org> wrote:
>
> From: Valentin Obst <kernel@...entinobst.de>
>
> The `from_err_ptr` function is safe. There is no need for the call to it
> to be inside the unsafe block.
>
> Reword the SAFETY comment to provide a better justification of why the
> FFI call is safe.
>
> Signed-off-by: Valentin Obst <kernel@...entinobst.de>
> Reviewed-by: Martin Rodriguez Reboredo <yakoyoku@...il.com>
> Reviewed-by: Alice Ryhl <aliceryhl@...gle.com>

Reviewed-by: Trevor Gross <tmgross@...ch.edu>

> ---
>  rust/kernel/error.rs | 10 +++-------
>  1 file changed, 3 insertions(+), 7 deletions(-)
>
> diff --git a/rust/kernel/error.rs b/rust/kernel/error.rs
> index 4f0c1edd63b7..4786d3ee1e92 100644
> --- a/rust/kernel/error.rs
> +++ b/rust/kernel/error.rs
> @@ -264,13 +264,9 @@ pub fn to_result(err: core::ffi::c_int) -> Result {
>  ///     pdev: &mut PlatformDevice,
>  ///     index: u32,
>  /// ) -> Result<*mut core::ffi::c_void> {
> -///     // SAFETY: FFI call.
> -///     unsafe {
> -///         from_err_ptr(bindings::devm_platform_ioremap_resource(
> -///             pdev.to_ptr(),
> -///             index,
> -///         ))
> -///     }
> +///     // SAFETY: `pdev` points to a valid platform device. There are no safety requirements
> +///     // on `index`.
> +///     from_err_ptr(unsafe { bindings::devm_platform_ioremap_resource(pdev.to_ptr(), index) })
>  /// }
>  /// ```
>  // TODO: Remove `dead_code` marker once an in-kernel client is available.
>
> --
> 2.43.0
>
>