From nobody Wed Dec 17 12:04:51 2025 Received: from mailout1.w1.samsung.com (mailout1.w1.samsung.com [210.118.77.11]) (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 9A9A6339B31 for ; Thu, 16 Oct 2025 13:38:18 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=210.118.77.11 ARC-Seal: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1760621900; cv=none; b=SrR7LPGWLUjyyQ8EX1Rd0avHn/iapVCg7dEDhfJoEN1+qMHDDnbSxbUPj4LorsOYJvBDGJ8UfamhsnH2f8Nz42YTtn202QXKMjaYiwdDIje81fH8mMz/r47AMFcUFn1HBfHXUaqAYpecf+tBzSDlGDDdtxyNer5B+Z5QMnBkCKo= ARC-Message-Signature: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1760621900; c=relaxed/simple; bh=NvJA+OvvqqDPKJCmfst2MXsWRWksJWnIw69DgMYVtX8=; h=From:Date:Subject:MIME-Version:Message-Id:In-Reply-To:To:Cc: Content-Type:References; b=VZ1v0Hn7SmKpm+ci+s9VRAZw77EcFZHXrrn8dn09K9D2Dhan98zk2Dv3xJYdTyJUQF4M3EOruCWycsJUXUp8EbvOpYF2Yb1VosHeivJ0B6I7QgqFANDauhI4BL9e6QPdQ7pFuL5xV2D4qSyjYMXcAZj9HVyA+aVgwVtn8asBV+A= ARC-Authentication-Results: i=1; smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=samsung.com; spf=pass smtp.mailfrom=samsung.com; dkim=pass (1024-bit key) header.d=samsung.com header.i=@samsung.com header.b=WxZjjjw6; arc=none smtp.client-ip=210.118.77.11 Authentication-Results: smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=samsung.com Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=samsung.com Authentication-Results: smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=samsung.com header.i=@samsung.com header.b="WxZjjjw6" Received: from eucas1p1.samsung.com (unknown [182.198.249.206]) by mailout1.w1.samsung.com (KnoxPortal) with ESMTP id 20251016133817euoutp01e5506d10090944f1a953143e453a9d5f~u-EmPJXsw0216702167euoutp01Y for ; Thu, 16 Oct 2025 13:38:17 +0000 (GMT) DKIM-Filter: OpenDKIM Filter v2.11.0 mailout1.w1.samsung.com 20251016133817euoutp01e5506d10090944f1a953143e453a9d5f~u-EmPJXsw0216702167euoutp01Y DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=samsung.com; s=mail20170921; t=1760621897; bh=hzrq4YN2uxPOg/leJpiVtHnEWUk+dlsqQnLVVz66HuM=; h=From:Date:Subject:In-Reply-To:To:Cc:References:From; b=WxZjjjw6sWUb4PnNgYlnHMrYxYhTnNbXCL6vcZIwAGnXqGqQxkisuEQavXsKTryzA EBj5NsQ8Mueteh8zEKTCYC0UNFjdn0v6XkY6GONxbhCLt7COCdnV9rglhSQ7aktdEj mDYB4vA6+SEMV/G7g9/Edm/A8y+Nl9dbObblKLbI= Received: from eusmtip2.samsung.com (unknown [203.254.199.222]) by eucas1p1.samsung.com (KnoxPortal) with ESMTPA id 20251016133816eucas1p1cf2b9498e4cedda601aaa73df353a03f~u-ElojZHD2477524775eucas1p1I; Thu, 16 Oct 2025 13:38:16 +0000 (GMT) Received: from AMDC4942.eu.corp.samsungelectronics.net (unknown [106.210.136.40]) by eusmtip2.samsung.com (KnoxPortal) with ESMTPA id 20251016133814eusmtip2c78e6e9672676ae6818c90c58f0ec878~u-Ej1lwtn2342023420eusmtip2U; Thu, 16 Oct 2025 13:38:14 +0000 (GMT) From: Michal Wilczynski Date: Thu, 16 Oct 2025 15:38:01 +0200 Subject: [PATCH v16 1/7] pwm: Export `pwmchip_release` for external use Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: quoted-printable Message-Id: <20251016-rust-next-pwm-working-fan-for-sending-v16-1-a5df2405d2bd@samsung.com> In-Reply-To: <20251016-rust-next-pwm-working-fan-for-sending-v16-0-a5df2405d2bd@samsung.com> To: =?utf-8?q?Uwe_Kleine-K=C3=B6nig?= , Miguel Ojeda , Alex Gaynor , Boqun Feng , Gary Guo , =?utf-8?q?Bj=C3=B6rn_Roy_Baron?= , Andreas Hindborg , Alice Ryhl , Trevor Gross , Danilo Krummrich , Michal Wilczynski , Guo Ren , Fu Wei , Rob Herring , Krzysztof Kozlowski , Conor Dooley , Paul Walmsley , Palmer Dabbelt , Albert Ou , Alexandre Ghiti , Marek Szyprowski , Benno Lossin , Michael Turquette , Drew Fustini , Daniel Almeida , Benno Lossin , Drew Fustini Cc: linux-kernel@vger.kernel.org, linux-pwm@vger.kernel.org, rust-for-linux@vger.kernel.org, linux-riscv@lists.infradead.org, devicetree@vger.kernel.org, Elle Rhumsaa X-Mailer: b4 0.15-dev X-CMS-MailID: 20251016133816eucas1p1cf2b9498e4cedda601aaa73df353a03f X-Msg-Generator: CA Content-Type: text/plain; charset="utf-8" X-RootMTR: 20251016133816eucas1p1cf2b9498e4cedda601aaa73df353a03f X-EPHeader: CA X-CMS-RootMailID: 20251016133816eucas1p1cf2b9498e4cedda601aaa73df353a03f References: <20251016-rust-next-pwm-working-fan-for-sending-v16-0-a5df2405d2bd@samsung.com> The upcoming Rust abstraction layer for the PWM subsystem uses a custom `dev->release` handler to safely manage the lifetime of its driver data. To prevent leaking the memory of the `struct pwm_chip` (allocated by `pwmchip_alloc`), this custom handler must also call the original `pwmchip_release` function to complete the cleanup. Make `pwmchip_release` a global, exported function so that it can be called from the Rust FFI bridge. This involves removing the `static` keyword, adding a prototype to the public header, and exporting the symbol. Reviewed-by: Elle Rhumsaa Signed-off-by: Michal Wilczynski --- drivers/pwm/core.c | 3 ++- include/linux/pwm.h | 6 ++++++ 2 files changed, 8 insertions(+), 1 deletion(-) diff --git a/drivers/pwm/core.c b/drivers/pwm/core.c index ea2ccf42e81441d00a349f6d8641c92143d94797..47c9333baaf6c7d752a71c26bb1= 957ea2fd17a50 100644 --- a/drivers/pwm/core.c +++ b/drivers/pwm/core.c @@ -1608,12 +1608,13 @@ void pwmchip_put(struct pwm_chip *chip) } EXPORT_SYMBOL_GPL(pwmchip_put); =20 -static void pwmchip_release(struct device *pwmchip_dev) +void pwmchip_release(struct device *pwmchip_dev) { struct pwm_chip *chip =3D pwmchip_from_dev(pwmchip_dev); =20 kfree(chip); } +EXPORT_SYMBOL_GPL(pwmchip_release); =20 struct pwm_chip *pwmchip_alloc(struct device *parent, unsigned int npwm, s= ize_t sizeof_priv) { diff --git a/include/linux/pwm.h b/include/linux/pwm.h index 549ac4aaad59ba6d7ba58d818b46a58a8759e09c..148f056f336bbe17ffc3df22aa6= b6bc3ad854e40 100644 --- a/include/linux/pwm.h +++ b/include/linux/pwm.h @@ -488,6 +488,12 @@ int __pwmchip_add(struct pwm_chip *chip, struct module= *owner); #define pwmchip_add(chip) __pwmchip_add(chip, THIS_MODULE) void pwmchip_remove(struct pwm_chip *chip); =20 +/* + * For FFI wrapper use only: + * The Rust PWM abstraction needs this to properly free the pwm_chip. + */ +void pwmchip_release(struct device *dev); + int __devm_pwmchip_add(struct device *dev, struct pwm_chip *chip, struct m= odule *owner); #define devm_pwmchip_add(dev, chip) __devm_pwmchip_add(dev, chip, THIS_MOD= ULE) =20 --=20 2.34.1