From nobody Tue Apr 7 11:16:41 2026 Received: from mout01.posteo.de (mout01.posteo.de [185.67.36.65]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id 292323DD51A for ; Fri, 13 Mar 2026 18:12:38 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=185.67.36.65 ARC-Seal: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1773425560; cv=none; b=DDYFB3XzDRZoc+xbxKVvefw9oHzCgAu4o0Z+ESJHm5S8uXezpb6xX+12E1xWuDczp5WLpQR7IDjLznDEp7mIKeGtQMWkhR3U22Qjsm2T4lWqhPHH/5kr5wRpO5vm1A79seZ2nlGnBB8GsbpWeTrRnevV6GH+M4C2xVKUKCBavrk= ARC-Message-Signature: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1773425560; c=relaxed/simple; bh=keqz28rKvxuSgS9woVzrUhaF71wCeQ6RBjDla6L6OYM=; h=From:Date:Subject:MIME-Version:Content-Type:Message-Id:References: In-Reply-To:To:Cc; b=gEo/gWRmLgXh2+QF5BKYyUQGBt1Mz7ZEhkNkvGdpEuN+BTtF3q+P+j3cLpmZ3OO9443RnNUpA8jh7t8M9COxSXAznbjfMcr0dTKIzOwdQye+5MwQSIR4gPzvBzVgCQg9MfmXCmG+neOQaiZWxlHchNQQ+6FuyWz45a0RjGzh/ik= ARC-Authentication-Results: i=1; smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=posteo.de; spf=pass smtp.mailfrom=posteo.de; dkim=pass (2048-bit key) header.d=posteo.de header.i=@posteo.de header.b=EJBc90ci; arc=none smtp.client-ip=185.67.36.65 Authentication-Results: smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=posteo.de Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=posteo.de Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=posteo.de header.i=@posteo.de header.b="EJBc90ci" Received: from submission (posteo.de [185.67.36.169]) by mout01.posteo.de (Postfix) with ESMTPS id BCDE2240029 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=1773425550; bh=HVPpVZG7q91124YZI/Aaqk7D7oF9wWOqNzAvI9ipxxA=; h=From:Date:Subject:MIME-Version:Content-Type: Content-Transfer-Encoding:Message-Id:To:Cc:Autocrypt:OpenPGP:From; b=EJBc90ciqStILTS58+xx9ZQSJHxcbz8a0uPdxx+L+wxq4E5JTRAby/DAYNCxXc+vp 8GJC+jDoinDkHiBKnqskc7OdReASX23CmfM/n7NfjmQmwEGP+vVV3PRQvAOgHFOikh tH3DekWJzfz3Ju9JUa+eQIKR+zbPRba6aNHh8PXSOrRYXWdPiKcdbY33dSBG1MBFS3 dxcmjDFj/ZXBZeXIIa6cRkUUNV+rsEQm898gCYSpJdE/MBkNVv/He39Ng2b1M46lez 3orAOl/WnPZgaPAMUxAX2w32s4ljPyczzXKbGgaGPQEsfbAnZph2ixe4P9TnHzvcfH SaZ7k7SzUbo9g== 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` Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: quoted-printable 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. Wysocki" , Viresh Kumar , Boqun Feng , David Airlie , Simona Vetter , Boqun Feng Cc: 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, Markus Probst X-Developer-Signature: v=1; a=openpgp-sha256; l=2571; i=markus.probst@posteo.de; h=from:subject:message-id; bh=keqz28rKvxuSgS9woVzrUhaF71wCeQ6RBjDla6L6OYM=; b=owEBiQJ2/ZANAwAIATR2H/jnrUPSAcsmYgBptFN9OVuNhJqcH4ra1bSheygLt4ZfzA+F4c7xh /vWo+AEepKJAk8EAAEIADkWIQSCdBjE9KxY53IwxHM0dh/4561D0gUCabRTfRsUgAAAAAAEAA5t YW51MiwyLjUrMS4xMSwyLDIACgkQNHYf+OetQ9KUohAAm4rMGurhjYoODB7kiH4xTfowXrAT9Qr NKyXRXGHVG4zDzAnEtpm2uLHc3rl7TceKiVt7sM5G5VrKkPKtzn028dDXTRfOYXz4Fz8GnOU4jA tbRLW7V4xhg+TSDfPFcGDsqVgfSXE2ytSfs9a9CzS2ChDSNCRpm1EF0bSvNHpakTR6ZjKS/Hdiv XVMQi3RXnbEaaW/D/+IzD+eRJo9MuObzhi+aNRjF/1xpuxkavw50kcw1XurathwMfN4o/F4exEf kDiHiRs4SfBMhe9FSv5xzsLddBGy7BJh6B21fAxjAGTQA7Um4Pm1BdB0WJw3DawXG6xOjgMx1nR YgBmC79//e1O+w2VkSV7fLqKUPSopf+vIxKII0vSfkdRXyS8+rTTHLC5K+5f/WWSFct5vcPcSVZ HbqMnVY14EgetWKwzIud20skEUxPWwcsGaQnb+lJXoZXoiQ2gipUwYuS2GDm39oZK4MR2Ihd24F sWZPSsc2P9cP7UvsTLreH0dyJFwWvd5rvroDbJT7EWt7IQGQ8SgmvpeevQa/A3yHvZyVkuJ+q2u Sj2od32Og9MfOeNIPucEj2R9M34oQKFYs0SWi7BFwCQ7chI4Z1zW2oSz6umrspwABL+dM/WZBsP MfGQOhvtaEdq9ACfNcmCiUH5ZkDwt9anbLGuvLXUr1a6PZhw2/Ww= X-Developer-Key: i=markus.probst@posteo.de; a=openpgp; fpr=827418C4F4AC58E77230C47334761FF8E7AD43D2 Autocrypt: addr=markus.probst@posteo.de; prefer-encrypt=mutual; keydata=xsFNBGiDvXgBEADAXUceKafpl46S35UmDh2wRvvx+UfZbcTjeQOlSwKP7YVJ4JOZrVs93qReNLkO WguIqPBxR9blQ4nyYrqSCV+MMw/3ifyXIm6Pw2YRUDg+WTEOjTixRCoWDgUj1nOsvJ9tVAm76Ww+ /pAnepVRafMID0rqEfD9oGv1YrfpeFJhyE2zUw3SyyNLIKWD6QeLRhKQRbSnsXhGLFBXCqt9k5JA RhgQof9zvztcCVlT5KVvuyfC4H+HzeGmu9201BVyihJwKdcKPq+n/aY5FUVxNTgtI9f8wIbmfAja oT1pjXSp+dszakA98fhONM98pOq723o/1ZGMZukyXFfsDGtA3BB79HoopHKujLGWAGskzClwTjRQ xBqxh/U/lL1pc+0xPWikTNCmtziCOvv0KA0arDOMQlyFvImzX6oGVgE4ksKQYbMZ3Ikw6L1Rv1J+ FvN0aNwOKgL2ztBRYscUGcQvA0Zo1fGCAn/BLEJvQYShWKeKqjyncVGoXFsz2AcuFKe1pwETSsN6 OZncjy32e4ktgs07cWBfx0v62b8md36jau+B6RVnnodaA8++oXl3FRwiEW8XfXWIjy4umIv93tb8 8ekYsfOfWkTSewZYXGoqe4RtK80ulMHb/dh2FZQIFyRdN4HOmB4FYO5sEYFr9YjHLmDkrUgNodJC XCeMe4BO4iaxUQARAQABzRdtYXJrdXMucHJvYnN0QHBvc3Rlby5kZcLBkQQTAQgAOxYhBIJ0GMT0 rFjncjDEczR2H/jnrUPSBQJog714AhsDBQsJCAcCAiICBhUKCQgLAgQWAgMBAh4HAheAAAoJEDR2 H/jnrUPSgdkQAISaTk2D345ehXEkn5z2yUEjaVjHIE7ziqRaOgn/QanCgeTUinIv6L6QXUFvvIfH 1OLPwQ1hfvEg9NnNLyFezWSy6jvoVBTIPqicD/r3FkithnQ1IDkdSjrarPMxJkvuh3l7XZHo49GV HQ8i5zh5w4YISrcEtE99lJisvni2Jqx7we5tey9voQFDyM8jxlSWv3pmoUTCtBkX/eKHJXosgsuS B4TGDCVPOjla/emI5c9MhMG7O4WEEmoSdPbmraPw66YZD6uLyhV4DPHbiDWRzXWnClHSyjB9rky9 lausFxogvu4l9H+KDsXIadNDWdLdu1/enS/wDd9zh5S78rY2jeXaG4mnf4seEKamZ7KQ6FIHrcyP ezdDzssPQcTQcGRMQzCn6wP3tlGk7rsfmyHMlFqdRoNNv+ZER/OkmZFPW655zRfbMi0vtrqK2Awm 9ggobb1oktfd9PPNXMUY+DNVlgR2G7jLnenSoQausLUm0pHoNE8TWFv851Y6SOYnvn488sP1Tki5 F3rKwclawQFHUXTCQw+QSh9ay8xgnNZfH+u9NY7w3gPoeKBOAFcBc2BtzcgekeWS8qgEmm2/oNFV G0ivPQbRx8FjRKbuF7g3YhgNZZ0ac8FneuUtJ2PkSIFTZhaAiC0utvxk0ndmWFiW4acEkMZGrLaM L2zWNjrqwsD2zsFNBGiDvXgBEADCXQy1n7wjRxG12DOVADawjghKcG+5LtEf31WftHKLFbp/HArj BhkT6mj+CCI1ClqY+FYU5CK/s0ScMfLxRGLZ0Ktzawb78vOgBVFT3yB1yWBTewsAXdqNqRooaUNo 8cG/NNJLjhccH/7PO/FWX5qftOVUJ/AIsAhKQJ18Tc8Ik73v427EDxuKb9mTAnYQFA3Ev3hAiVbO 6Rv39amVOfJ8sqwiSUGidj2Fctg2aB5JbeMln0KCUbTD1LhEFepeKypfofAXQbGwaCjAhmkWy/q3 IT1mUrPxOngbxdRoOx1tGUC0HCMUW1sFaJgQPMmDcR0JGPOpgsKnitsSnN7ShcCr1buel7vLnUMD +TAZ5opdoF6HjAvAnBQaijtK6minkrM0seNXnCg0KkV8xhMNa6zCs1rq4GgjNLJue2EmuyHooHA4 7JMoLVHcxVeuNTp6K2+XRx0Pk4e2Lj8IVy9yEYyrywEOC5XRW37KJjsiOAsumi1rkvM7QREWgUDe Xs0+RpxI3QrrANh71fLMRo7LKRF3Gvw13NVCCC9ea20P4PwhgWKStkwO2NO+YJsAoS1QycMi/vKu 0EHhknYXamaSV50oZzHKmX56vEeJHTcngrM8R1SwJCYopCx9gkz90bTVYlitJa5hloWTYeMD7FNj Y6jfVSzgM/K4gMgUNDW/PPGeMwARAQABwsF2BBgBCAAgFiEEgnQYxPSsWOdyMMRzNHYf+OetQ9IF AmiDvXgCGwwACgkQNHYf+OetQ9LHDBAAhk+ab8+WrbS/b1/gYW3q1KDiXU719nCtfkUVXKidW5Ec Idlr5HGt8ilLoxSWT2Zi368iHCXS0WenGgPwlv8ifvB7TOZiiTDZROZkXjEBmU4nYjJ7GymawpWv oQwjMsPuq6ysbzWtOZ7eILx7cI0FjQeJ/Q2baRJub0uAZNwBOxCkAS6lpk5Fntd2u8CWmDQo4SYp xeuQ+pwkp0yEP30RhN2BO2DXiBEGSZSYh+ioGbCHQPIV3iVj0h6lcCPOqopZqyeCfigeacBI0nvN jHWz/spzF3+4OS+3RJvoHtAQmProxyGib8iVsTxgZO3UUi4TSODeEt0i0kHSPY4sCciOyXfAyYoD DFqhRjOEwBBxhr+scU4C1T2AflozvDwq3VSONjrKJUkhd8+WsdXxMdPFgBQuiKKwUy11mz6KQfcR wmDehF3UaUoxa+YIhWPbKmycxuX/D8SvnqavzAeAL1OcRbEI/HsoroVlEFbBRNBZLJUlnTPs8ZcU 4+8rq5YX1GUrJL3jf6SAfSgO7UdkEET3PdcKFYtS+ruV1Cp5V0q4kCfI5jk25iiz8grM2wOzVSsc l1mEkhiEPH87HP0whhb544iioSnumd3HJKL7dzhRegsMizatupp8D65A2JziW0WKopa1iw9fti3A aBeNN4ijKZchBXHPgVx+YtWRHfcm4l8= OpenPGP: url=https://posteo.de/keys/markus.probst@posteo.de.asc; preference=encrypt 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) -> Resu= lt where T: 'static, { - devres::register(dev, Self::new()?, GFP_KERNEL) + devres::register(dev, Self::new()?, GFP_KERNEL)?; + Ok(()) } } =20 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 =3D KBox::pin_init(data, flags)?; =20 + let data_ptr =3D &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 unboun= d 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( =20 let reg =3D Registration::::new(drm, flags)?; =20 - devres::register(dev, reg, GFP_KERNEL) + devres::register(dev, reg, GFP_KERNEL)?; + Ok(()) } =20 /// Returns a reference to the `Device` instance for this registration. --=20 2.52.0