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Date: Tue, 24 Feb 2026 16:36:16 +0100
Message-Id: <DGNAX70LRK25.1B13ZK4XGPMY6@kernel.org>
Subject: Re: [RFC PATCH v3 1/5] rtc: add device selector for rtc_class_ops
 callbacks
Cc: "Alexandre Belloni" <alexandre.belloni@bootlin.com>, "Alvin Sun"
 <alvin.sun@linux.dev>, "Miguel Ojeda" <ojeda@kernel.org>, "Boqun Feng"
 <boqun.feng@gmail.com>, "Gary Guo" <gary@garyguo.net>,
 =?utf-8?q?Bj=C3=B6rn_Roy_Baron?= <bjorn3_gh@protonmail.com>, "Benno Lossin"
 <lossin@kernel.org>, "Andreas Hindborg" <a.hindborg@kernel.org>, "Alice
 Ryhl" <aliceryhl@google.com>, "Trevor Gross" <tmgross@umich.edu>,
 <linux-rtc@vger.kernel.org>, <rust-for-linux@vger.kernel.org>, "Greg
 Kroah-Hartman" <gregkh@linuxfoundation.org>
To: "Rafael J. Wysocki" <rafael@kernel.org>
From: "Danilo Krummrich" <dakr@kernel.org>
References: <d1c9e33b-e1f3-41c6-af5e-a85fe2b86d10@linux.dev>
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On Tue Feb 24, 2026 at 4:23 PM CET, Rafael J. Wysocki wrote:
> On the C side it really depends on what probe (of the parent) does.
> If it sets driver_data of the parent before registering the RTC
> device, then it'll all work.  If it registers the RTC device before
> setting driver_data for the parent, there may be a race.
>
> IIUC, the idea on the Rust side is to use the capabilities of the
> compiler to eliminate the possibility of messing up the ordering in a
> driver.

Yes, this is all spot-on.