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Date: Sat, 30 May 2026 16:08:38 +0200
Message-Id: <DIW2JUUL6A6J.96VI4IQN6HYU@kernel.org>
Subject: Re: [PATCH v8 3/5] rust: add basic serial device bus abstractions
Cc: "Markus Probst via B4 Relay"
 <devnull+markus.probst.posteo.de@kernel.org>, "Rob Herring"
 <robh@kernel.org>, "Greg Kroah-Hartman" <gregkh@linuxfoundation.org>, "Jiri
 Slaby" <jirislaby@kernel.org>, "Miguel Ojeda" <ojeda@kernel.org>, "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>, "Kari Argillander"
 <kari.argillander@gmail.com>, "Rafael J. Wysocki" <rafael@kernel.org>,
 "Viresh Kumar" <viresh.kumar@linaro.org>, "Boqun Feng" <boqun@kernel.org>,
 "David Airlie" <airlied@gmail.com>, "Simona Vetter" <simona@ffwll.ch>,
 <linux-serial@vger.kernel.org>, <linux-kernel@vger.kernel.org>,
 <rust-for-linux@vger.kernel.org>, <linux-pm@vger.kernel.org>,
 <driver-core@lists.linux.dev>, <dri-devel@lists.freedesktop.org>
To: "Markus Probst" <markus.probst@posteo.de>
From: "Danilo Krummrich" <dakr@kernel.org>
References: <20260530-rust_serdev-v8-0-2a95f1da22a7@posteo.de>
 <20260530-rust_serdev-v8-3-2a95f1da22a7@posteo.de>
 <DIW1B4FUIXO7.28GSUA0CEA4EV@kernel.org>
 <4638946fc49a38797b716ea173c93327eb751479.camel@posteo.de>
 <ad98dfb1d8469022519d37364e8a068bed3b5687.camel@posteo.de>
 <888dc39c52bb6ddac1a1eed7876c4573bdbef002.camel@posteo.de>
In-Reply-To: <888dc39c52bb6ddac1a1eed7876c4573bdbef002.camel@posteo.de>

On Sat May 30, 2026 at 4:00 PM CEST, Markus Probst wrote:
> On Sat, 2026-05-30 at 15:53 +0200, Markus Probst wrote:
>> On Sat, 2026-05-30 at 15:37 +0200, Markus Probst wrote:
>> > If I think about it, I can't even close it inside remove_callback afte=
r
>> > `T::unbind`. With the driver lifetimes, the driver could store the
>> > `serdev::Device<Bound>` pointer in its DriverData and could still make
>> > calls to the device.
>> >=20
>> > Any suggestions?

Now that there is no public drvdata() accessor anymore, all bus device priv=
ate
data accesses go through the bus abstraction.

So, you could go back to your original approach and wrap the state in a bus
specific bus device private data wrapper type, which would also get you rid=
 of
the rust_private_data pointer you add to struct serdev_device.