linux-kernel - Re: [PATCH v3 1/2] rust: irq: add support for request

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Message-ID: <aD7Lhsjh6HPXedjT@cassiopeiae>
Date: Tue, 3 Jun 2025 12:16:38 +0200
From: Danilo Krummrich <dakr@...nel.org>
To: Alice Ryhl <aliceryhl@...gle.com>
Cc: Daniel Almeida <daniel.almeida@...labora.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 <benno.lossin@...ton.me>,
	Andreas Hindborg <a.hindborg@...nel.org>,
	Trevor Gross <tmgross@...ch.edu>,
	Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
	"Rafael J. Wysocki" <rafael@...nel.org>,
	Thomas Gleixner <tglx@...utronix.de>, linux-kernel@...r.kernel.org,
	rust-for-linux@...r.kernel.org
Subject: Re: [PATCH v3 1/2] rust: irq: add support for request_irq()

On Tue, Jun 03, 2025 at 12:09:05PM +0200, Danilo Krummrich wrote:
> Yes, we could solve this with a lock as well, but it would be an additional
> lock, just to maintain the current drop() semantics, which I don't see much
> value in.

If we want to keep the current drop() semantics we could use a completion
instead.

	// Devres::drop()
	revoke_nosync()
	complete()

	// devres_callback
	if !try_revoke() {
		// we end up here if try_revoke() indicates that the object was
		// revoked already
		wait_for_completion()
	}