linux-kernel - Re: [PATCH v8 0/9] More Rust bindings for device property reads

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Message-ID: <aEtjONTgqDikCoB6@cassiopeiae>
Date: Fri, 13 Jun 2025 01:31:04 +0200
From: Danilo Krummrich <dakr@...nel.org>
To: Remo Senekowitsch <remo@...nzli.dev>
Cc: Rob Herring <robh@...nel.org>, Saravana Kannan <saravanak@...gle.com>,
	Miguel Ojeda <ojeda@...nel.org>,
	Alex Gaynor <alex.gaynor@...il.com>,
	Boqun Feng <boqun.feng@...il.com>, Gary Guo <gary@...yguo.net>,
	Björn Roy Baron <bjorn3_gh@...tonmail.com>,
	Benno Lossin <lossin@...nel.org>,
	Andreas Hindborg <a.hindborg@...nel.org>,
	Alice Ryhl <aliceryhl@...gle.com>, Trevor Gross <tmgross@...ch.edu>,
	Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
	"Rafael J. Wysocki" <rafael@...nel.org>,
	Dirk Behme <dirk.behme@...bosch.com>, linux-kernel@...r.kernel.org,
	devicetree@...r.kernel.org, rust-for-linux@...r.kernel.org
Subject: Re: [PATCH v8 0/9] More Rust bindings for device property reads

On Wed, Jun 11, 2025 at 12:28:59PM +0200, Remo Senekowitsch wrote:
> Remo Senekowitsch (9):
>   rust: device: Create FwNode abstraction for accessing device
>     properties
>   rust: device: Enable accessing the FwNode of a Device
>   rust: device: Move property_present() to FwNode
>   rust: device: Enable printing fwnode name and path
>   rust: device: Introduce PropertyGuard
>   rust: device: Implement accessors for firmware properties
>   samples: rust: platform: Add property read examples

Applied to driver-core-testing, thanks!

Once the patches passed 0-day testing they will be merged into driver-core-next.

>   rust: device: Add child accessor and iterator
>   rust: device: Add property_get_reference_args

I did drop those two patches for now, because:

  (1) They're basically dead code.

  (2) It seems that FwNode::property_get_reference_args() leaks a struct
      fwnode_handle reference. property_get_reference_args() explicitly says
      that the caller is responsible "for calling fwnode_handle_put() on the
      returned @args->fwnode pointer", which doesn't seem to happen.

Can you please fix the leak and resend those two patches with an additional one
that adds a sample usage of the introduced methods to the platform sample
driver?