From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org Received: from gabe.freedesktop.org (gabe.freedesktop.org [131.252.210.177]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.lore.kernel.org (Postfix) with ESMTPS id 6CF3AD58B18 for ; Sun, 15 Mar 2026 11:21:10 +0000 (UTC) Received: from gabe.freedesktop.org (localhost [127.0.0.1]) by gabe.freedesktop.org (Postfix) with ESMTP id 9ECE210E235; Sun, 15 Mar 2026 11:21:09 +0000 (UTC) Authentication-Results: gabe.freedesktop.org; dkim=pass (2048-bit key; secure) header.d=posteo.de header.i=@posteo.de header.b="N6fC1Hq9"; dkim-atps=neutral Received: from mout02.posteo.de (mout02.posteo.de [185.67.36.66]) by gabe.freedesktop.org (Postfix) with ESMTPS id 7F6C710E373 for ; Fri, 13 Mar 2026 18:12:32 +0000 (UTC) Received: from submission (posteo.de [185.67.36.169]) by mout02.posteo.de (Postfix) with ESMTPS id 0E0BF240101 for ; Fri, 13 Mar 2026 19:12:30 +0100 (CET) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=posteo.de; s=2017; t=1773425551; bh=HVPpVZG7q91124YZI/Aaqk7D7oF9wWOqNzAvI9ipxxA=; h=From:Date:Subject:MIME-Version:Content-Type: Content-Transfer-Encoding:Message-Id:To:Cc:Autocrypt:OpenPGP:From; b=N6fC1Hq9fENUcd/7epfSgmN1kKE68864H09jGf4xJ/+4mqbBwY0muBDPCcgOZnEZY sSGQdOaAS91q6vgvcvh4drRcmttR9ubtKF99qFFmKFvQqCTsLD7BO1SFh6SoPZ+AEQ rkNZoh/Wz8WN1OK3yBBQgxZOIP0VtHLE85fBhTHbjQmSev37g6oGi7Rn7UTcC3nfYO MxGuQkBTzzfvK76EamD70YSUUp3mkIapDkXuQ7Y4rZs0HJl4v1dtsovMrWyKHabiox F71IYiqYGdu+WJq/LnYQfK778P6ovyvpMBcZcGSrjeh8Ko6yqc3rBLSCc0APE7O0RD 5l8VLs4gAr31w== Received: from customer (localhost [127.0.0.1]) by submission (posteo.de) with ESMTPSA id 4fXXdR3sJbz6twH; Fri, 13 Mar 2026 19:12:27 +0100 (CET) From: Markus Probst Date: Fri, 13 Mar 2026 18:12:29 +0000 Subject: [PATCH v3 1/4] rust: devres: return reference in `devres::register` MIME-Version: 1.0 Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: 7bit Message-Id: <20260313-rust_serdev-v3-1-c9a3af214f7f@posteo.de> References: <20260313-rust_serdev-v3-0-c9a3af214f7f@posteo.de> In-Reply-To: <20260313-rust_serdev-v3-0-c9a3af214f7f@posteo.de> To: Rob Herring , Greg Kroah-Hartman , Jiri Slaby , Miguel Ojeda , Gary Guo , =?utf-8?q?Bj=C3=B6rn_Roy_Baron?= , Benno Lossin , Andreas Hindborg , Alice Ryhl , Trevor Gross , Danilo Krummrich , Kari Argillander , "Rafael J. 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preference=encrypt X-Mailman-Approved-At: Sun, 15 Mar 2026 11:20:58 +0000 X-BeenThere: dri-devel@lists.freedesktop.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: Direct Rendering Infrastructure - Development List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: dri-devel-bounces@lists.freedesktop.org Sender: "dri-devel" Return the reference to the initialized data in the `devres::register` function. This is needed in a following commit (rust: add basic serial device bus abstractions). Signed-off-by: Markus Probst --- rust/kernel/cpufreq.rs | 3 ++- rust/kernel/devres.rs | 15 +++++++++++++-- rust/kernel/drm/driver.rs | 3 ++- 3 files changed, 17 insertions(+), 4 deletions(-) diff --git a/rust/kernel/cpufreq.rs b/rust/kernel/cpufreq.rs index 76faa1ac8501..8cf86bb8e0f4 100644 --- a/rust/kernel/cpufreq.rs +++ b/rust/kernel/cpufreq.rs @@ -1051,7 +1051,8 @@ pub fn new_foreign_owned(dev: &Device) -> Result where T: 'static, { - devres::register(dev, Self::new()?, GFP_KERNEL) + devres::register(dev, Self::new()?, GFP_KERNEL)?; + Ok(()) } } diff --git a/rust/kernel/devres.rs b/rust/kernel/devres.rs index 6afe196be42c..f882bace8601 100644 --- a/rust/kernel/devres.rs +++ b/rust/kernel/devres.rs @@ -326,15 +326,26 @@ fn register_foreign

(dev: &Device, data: P) -> Result /// } /// /// fn from_bound_context(dev: &Device) -> Result { -/// devres::register(dev, Registration::new(), GFP_KERNEL) +/// devres::register(dev, Registration::new(), GFP_KERNEL)?; +/// Ok(()) /// } /// ``` -pub fn register(dev: &Device, data: impl PinInit, flags: Flags) -> Result +pub fn register<'a, T, E>( + dev: &'a Device, + data: impl PinInit, + flags: Flags, +) -> Result<&'a T> where T: Send + 'static, Error: From, { let data = KBox::pin_init(data, flags)?; + let data_ptr = &raw const *data; + register_foreign(dev, data) + // SAFETY: `dev` is valid for the lifetime of 'a. As long as there is a reference to + // `Device`, it is guaranteed that the device is not unbound and data has not been + // dropped. Thus `data_ptr` is also valid for the lifetime of 'a. + .map(|()| unsafe { &*data_ptr }) } diff --git a/rust/kernel/drm/driver.rs b/rust/kernel/drm/driver.rs index e09f977b5b51..51e0c7e30cc2 100644 --- a/rust/kernel/drm/driver.rs +++ b/rust/kernel/drm/driver.rs @@ -145,7 +145,8 @@ pub fn new_foreign_owned( let reg = Registration::::new(drm, flags)?; - devres::register(dev, reg, GFP_KERNEL) + devres::register(dev, reg, GFP_KERNEL)?; + Ok(()) } /// Returns a reference to the `Device` instance for this registration. -- 2.52.0