linux-kernel - Re: [RFC PATCH 3/3] cpufreq: Add Rust based cpufreq-dt driver

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Date: Sun, 07 Apr 2024 09:54:22 +0000
From: Benno Lossin <benno.lossin@...ton.me>
To: Viresh Kumar <viresh.kumar@...aro.org>, "Rafael J. Wysocki" <rafael@...nel.org>, Miguel Ojeda <miguel.ojeda.sandonis@...il.com>, 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>, Andreas Hindborg <a.hindborg@...sung.com>, Alice Ryhl <aliceryhl@...gle.com>
Cc: linux-pm@...r.kernel.org, Vincent Guittot <vincent.guittot@...aro.org>, Stephen Boyd <sboyd@...nel.org>, Nishanth Menon <nm@...com>, rust-for-linux@...r.kernel.org, Manos Pitsidianakis <manos.pitsidianakis@...aro.org>, Erik Schilling <erik.schilling@...aro.org>, Alex Bennée <alex.bennee@...aro.org>, Joakim Bech <joakim.bech@...aro.org>, linux-kernel@...r.kernel.org
Subject: Re: [RFC PATCH 3/3] cpufreq: Add Rust based cpufreq-dt driver

On 05.04.24 13:09, Viresh Kumar wrote:
> +// Finds exact supply name from the OF node.
> +fn find_supply_name_exact(np: *mut bindings::device_node, name: &str) -> Option<CString> {
> +    let sname = CString::try_from_fmt(fmt!("{}-supply", name)).ok()?;
> +
> +    // SAFETY: The OF node is guaranteed by the C code to be valid.
> +    let pp = unsafe { bindings::of_find_property(np, sname.as_ptr() as *mut _, ptr::null_mut()) };

Drivers should avoid calling `unsafe` code as much as possible. They
also should not be calling `bindings` code directly. Please write (or
find) abstractions for these `unsafe` calls.

-- 
Cheers,
Benno

> +    if pp.is_null() {
> +        None
> +    } else {
> +        CString::try_from_fmt(fmt!("{}", name)).ok()
> +    }
> +}