From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from smtp.kernel.org (aws-us-west-2-korg-mail-1.web.codeaurora.org [10.30.226.201]) (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 0B43633F383; Tue, 3 Mar 2026 11:57:30 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=10.30.226.201 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1772539051; cv=none; b=MNwlTF36O620k4TrwVMh2+m+JwrulypwQDVL5YQgwNIdOKbuBhw9o67Ogl6GA0owlijK1UueaaepmBjYHHJZyJNmhGNcclKuc2OYQDXIahW8M0bSGbNctrr5UXGgvPj19FLOug6WdRwc0TVxk/gjOnFCBHIxylkyEhcMLhE4804= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1772539051; c=relaxed/simple; bh=vXaHvCEHJXa60E12gJk4qXYIo6yuZXE+bxs1JmCmVKI=; h=From:To:Cc:Subject:Date:Message-ID:MIME-Version; b=fnMhORnIDoCroHZqMJcdlhK99E/snPeCUX1fq1CmTj0SDR2cVHQydvAyzqCUN/j8ykvqX9L63uXwOZsXP3i0PWpDZY56Ajou2jVyJEAxZv4AMf6cjtYuBPG4BVEryvSPjkm3q3ecoh9rIlCyJdCg4VitHz+lrTeUE2mB5RxarMI= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b=QMEYOJMB; arc=none smtp.client-ip=10.30.226.201 Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b="QMEYOJMB" Received: by smtp.kernel.org (Postfix) with ESMTPSA id 1895CC116C6; Tue, 3 Mar 2026 11:57:26 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1772539050; bh=vXaHvCEHJXa60E12gJk4qXYIo6yuZXE+bxs1JmCmVKI=; h=From:To:Cc:Subject:Date:From; b=QMEYOJMB3DeR1jQdolTaUXAdR0T4xlXJUqmGaZ2z2Fb7auuJToYN8vNDDx5lCCpAw SzgzOogn/OsS2Jhw2ROKEJHX1igHMLBUIzsJ4PhyQXfWxAEXBblCVI1g/YZY/To7i3 qRZT4rb7NcxkziIe0UHAQQk93MJFTpMb+eX8SYirsJu89Bq5Do/w+fdv9vLeDq/hic Ey2QaLrbeiIZPs7s0MgK2/gUNVBnFTmcBYXQ/ovv1PWIO1EGIg0PF4co8x1vGQhCKt Mlr8UIgcT6EMfLzt2opMnPSXylZB+OU5L4qsYgU0RHDi2317uZgnJecmrc16iu2rVo KaL/iRCcpArqA== From: Danilo Krummrich To: gregkh@linuxfoundation.org, rafael@kernel.org, hanguidong02@gmail.com, ysato@users.sourceforge.jp, dalias@libc.org, glaubitz@physik.fu-berlin.de, abelvesa@kernel.org, srini@kernel.org, s.nawrocki@samsung.com, nuno.sa@analog.com Cc: driver-core@lists.linux.dev, linux-kernel@vger.kernel.org, imx@lists.linux.dev, linux-hwmon@vger.kernel.org, linux-arm-msm@vger.kernel.org, linux-sound@vger.kernel.org, linux-sh@vger.kernel.org, Danilo Krummrich Subject: [PATCH v2 0/4] driver core: generalize driver_override infrastructure Date: Tue, 3 Mar 2026 12:53:17 +0100 Message-ID: <20260303115720.48783-1-dakr@kernel.org> X-Mailer: git-send-email 2.53.0 Precedence: bulk X-Mailing-List: linux-sh@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: 8bit Currently, there are 12 busses (including platform and PCI) that duplicate the driver_override logic for their individual devices. All of them seem to be prone to the bug described in [1]. While this could be solved for every bus individually using a separate lock, solving this in the driver-core generically results in less (and cleaner) changes overall. Thus, move driver_override to struct device, provide corresponding accessors for busses and handle locking with a separate lock internally. In particular, add device_set_driver_override(), device_has_driver_override(), device_match_driver_override() and a helper, DEVICE_ATTR_DRIVER_OVERRIDE(), to declare the corresponding sysfs store() and show() callbacks. Until all busses have migrated, keep driver_set_override() in place. Note that we can't use the device lock for the reasons described in [2]. This patch series includes the migration of the platform bus; patches for all other affected busses still need to be extracted as a follow-up of the WIP treewide patch in [3]. [1] https://bugzilla.kernel.org/show_bug.cgi?id=220789 [2] https://lore.kernel.org/driver-core/DGRGTIRHA62X.3RY09D9SOK77P@kernel.org/ [3] https://git.kernel.org/pub/scm/linux/kernel/git/dakr/linux.git/log/?h=driver_override Changes in v2: - Drop DEVICE_ATTR_DRIVER_OVERRIDE() and make driver_override a struct bus_type feature instead. - Add driver_override documentation in .../driver-model/binding.rst. - Move kfree(dev->driver_override.name) before release(). - hwmon: axi-fan: Use NULL instead of dev_name() in devm_request_threaded_irq(). Danilo Krummrich (4): driver core: generalize driver_override in struct device docs: driver-model: document driver_override hwmon: axi-fan: don't use driver_override as IRQ name driver core: platform: use generic driver_override infrastructure .../driver-api/driver-model/binding.rst | 48 +++++++++++++++ arch/sh/drivers/platform_early.c | 6 +- drivers/base/bus.c | 43 ++++++++++++- drivers/base/core.c | 2 + drivers/base/dd.c | 60 +++++++++++++++++++ drivers/base/platform.c | 37 ++---------- drivers/bus/simple-pm-bus.c | 4 +- drivers/clk/imx/clk-scu.c | 3 +- drivers/hwmon/axi-fan-control.c | 2 +- drivers/slimbus/qcom-ngd-ctrl.c | 6 +- include/linux/device.h | 54 +++++++++++++++++ include/linux/device/bus.h | 4 ++ include/linux/platform_device.h | 5 -- sound/soc/samsung/i2s.c | 6 +- 14 files changed, 228 insertions(+), 52 deletions(-) base-commit: 11439c4635edd669ae435eec308f4ab8a0804808 -- 2.53.0