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 bombadil.infradead.org (bombadil.infradead.org [198.137.202.133]) (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 2F4EDCD4F35 for ; Tue, 12 May 2026 12:17:57 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=lists.infradead.org; s=bombadil.20210309; h=Sender: Content-Transfer-Encoding:Content-Type:List-Subscribe:List-Help:List-Post: List-Archive:List-Unsubscribe:List-Id:MIME-Version:References:In-Reply-To: Message-ID:Date:Subject:Cc:To:From:Reply-To:Content-ID:Content-Description: Resent-Date:Resent-From:Resent-Sender:Resent-To:Resent-Cc:Resent-Message-ID: List-Owner; bh=l5aIngCOtp19nQob427zhkyFtZvakVZfKh2x6Ax+Yns=; b=gD30UbwpBrjAr7 l8pgx29gmn1R5zYFx5X3c7NUji5kYRXYSQNoAyroFzWJ/2qQluTMmhtyBFnmR57zCPwMUwvopKjDK X1ofXqseiiesuDr6uZxpfHKzovis4/TXN4qUGfh/wKJGI6rzmb7+2ugLvTw9S6WVXlMjWV2rUCZIw JT7+RWtxBnomdLimTc8cmd1eCcg0QkXhuNQ+vy/3QdwiBAfcgZfNQ5k4ydTTd1CHXFiiMOv9+BM2h FHyZMlI6l2JrApTsTbtG5dTCfzi9NKGgm8e7KqdJfQI8gTeVXxlx63jso0u9srcWRSa0m9UUqVrXU zpx0ptHbT/WkwOl+OUoA==; Received: from localhost ([::1] helo=bombadil.infradead.org) by bombadil.infradead.org with esmtp (Exim 4.99.1 #2 (Red Hat Linux)) id 1wMm3g-0000000GeFj-3rXO; Tue, 12 May 2026 12:17:56 +0000 Received: from mgamail.intel.com ([198.175.65.21]) by bombadil.infradead.org with esmtps (Exim 4.99.1 #2 (Red Hat Linux)) id 1wMm3d-0000000GeBi-3SDA for linux-i3c@lists.infradead.org; Tue, 12 May 2026 12:17:54 +0000 DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=intel.com; i=@intel.com; q=dns/txt; s=Intel; t=1778588274; x=1810124274; h=from:to:cc:subject:date:message-id:in-reply-to: references:mime-version:content-transfer-encoding; bh=RFcgaEUNJWXUG55Vm6q7p6mqgRVk7lVpZd7mGX4qEcQ=; b=mJjRbEhd7QRKglXcxLQ5Y8HLArud4UHVxcry+dS9pzKG3GZg5IMm1/fh l/qqbAq0GtcGubBnEfgMC/rJtsC8iIhgV6yfQXtjCVJAmmw/D+rhXmaDa cTdrVwJH+/FC2a6vTusmQvRtDjBxF8ZBvjOvzcPlw+dn0DYZnxX9qa5yw ap2z5h0mUrMGhHD1tswgarfErshFmGnhdeGRKBxoKAAU2Tr28Nrp3xufw TZb7jHRWADeFrEuvp9t3x1LlDOVIf63hMx1xFhIFoak6FDzF7es/nLqzJ vhypaBBa5RHRyfnFNhmn8Ll/1IXPliI/8Wr7e642z2l6uYRdMnOVGoHFm w==; X-CSE-ConnectionGUID: tzpoE3x7RFuYtAEUCb+jZQ== X-CSE-MsgGUID: 1ruTmd84Qn+tFezBZZhg8A== X-IronPort-AV: E=McAfee;i="6800,10657,11783"; a="79389499" X-IronPort-AV: E=Sophos;i="6.23,230,1770624000"; d="scan'208";a="79389499" Received: from orviesa003.jf.intel.com ([10.64.159.143]) by orvoesa113.jf.intel.com with ESMTP/TLS/ECDHE-RSA-AES256-GCM-SHA384; 12 May 2026 05:17:54 -0700 X-CSE-ConnectionGUID: 6wBN/LPISeyIMqFSJBFo+Q== X-CSE-MsgGUID: MIIBbum3TiiqFV8qDLnafQ== X-ExtLoop1: 1 X-IronPort-AV: E=Sophos;i="6.23,230,1770624000"; d="scan'208";a="241756142" Received: from amilburn-desk.amilburn-desk (HELO ahunter6-desk) ([10.245.245.121]) by ORVIESA003-auth.jf.intel.com with ESMTP/TLS/ECDHE-RSA-AES256-GCM-SHA384; 12 May 2026 05:17:52 -0700 From: Adrian Hunter To: alexandre.belloni@bootlin.com Cc: Frank.Li@nxp.com, linux-i3c@lists.infradead.org, linux-kernel@vger.kernel.org Subject: [PATCH 4/8] i3c: master: Ensure Hot-Join operations are stopped on shutdown Date: Tue, 12 May 2026 15:17:28 +0300 Message-ID: <20260512121732.406009-5-adrian.hunter@intel.com> X-Mailer: git-send-email 2.51.0 In-Reply-To: <20260512121732.406009-1-adrian.hunter@intel.com> References: <20260512121732.406009-1-adrian.hunter@intel.com> MIME-Version: 1.0 Organization: Intel Finland Oy, Registered Address: c/o Alberga Business Park, 6 krs, Bertel Jungin Aukio 5, 02600 Espoo, Business Identity Code: 0357606 - 4, Domiciled in Helsinki X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.9.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20260512_051753_910398_98CFD25A X-CRM114-Status: GOOD ( 18.17 ) X-BeenThere: linux-i3c@lists.infradead.org X-Mailman-Version: 2.1.34 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit Sender: "linux-i3c" Errors-To: linux-i3c-bounces+linux-i3c=archiver.kernel.org@lists.infradead.org System shutdown invokes each device's bus shutdown callback to quiesce hardware, but the I3C bus type does not currently implement one. As a result, on shutdown the controller's Hot-Join work and any in-flight i3c_master_do_daa() can keep running (or be newly triggered) while the rest of the system is being torn down. A similar window exists at i3c_master_unregister() time: cancel_work_sync() on hj_work prevents queued work from completing, but does not stop a fresh Hot-Join IBI from re-queueing the worker, nor a concurrent sysfs writer from toggling Hot-Join via i3c_set_hotjoin(). Introduce a single "shutting down" gate in the I3C core, set under the bus maintenance lock so it is observed by any in-progress DAA path before pending work is cancelled. Install an i3c_bus_type shutdown callback that engages this gate for master devices during system shutdown, and use the same gate in i3c_master_unregister() so both paths get identical guarantees. Once the gate is engaged, the Hot-Join worker, i3c_master_do_daa_ext() and i3c_set_hotjoin() all bail out cleanly, so Hot-Join IBIs that race with shutdown become no-ops, direct DAA callers see -ENODEV, and sysfs writers can no longer re-enable Hot-Join through ops->enable_hotjoin() while the controller is going away. No functional change for the steady-state runtime path; the new checks only take effect once the controller has been marked as shutting down. Signed-off-by: Adrian Hunter --- drivers/i3c/master.c | 52 +++++++++++++++++++++++++++----------- include/linux/i3c/master.h | 2 ++ 2 files changed, 39 insertions(+), 15 deletions(-) diff --git a/drivers/i3c/master.c b/drivers/i3c/master.c index cdb5cb2aa65d..a59c4b744b36 100644 --- a/drivers/i3c/master.c +++ b/drivers/i3c/master.c @@ -368,14 +368,6 @@ static void i3c_device_remove(struct device *dev) driver->remove(i3cdev); } -const struct bus_type i3c_bus_type = { - .name = "i3c", - .match = i3c_device_match, - .probe = i3c_device_probe, - .remove = i3c_device_remove, -}; -EXPORT_SYMBOL_GPL(i3c_bus_type); - static enum i3c_addr_slot_status i3c_bus_get_addr_slot_status_mask(struct i3c_bus *bus, u16 addr, u32 mask) { @@ -637,7 +629,8 @@ static void i3c_master_hj_work_fn(struct work_struct *work) { struct i3c_master_controller *master = container_of(work, typeof(*master), hj_work); - i3c_master_do_daa(master); + if (!master->shutting_down) + i3c_master_do_daa(master); } static int i3c_set_hotjoin(struct i3c_master_controller *master, bool enable) @@ -658,7 +651,9 @@ static int i3c_set_hotjoin(struct i3c_master_controller *master, bool enable) i3c_bus_maintenance_lock(&master->bus); - if (enable) + if (master->shutting_down) + ret = -ENODEV; + else if (enable) ret = master->ops->enable_hotjoin(master); else ret = master->ops->disable_hotjoin(master); @@ -837,6 +832,30 @@ static const struct device_type i3c_masterdev_type = { .groups = i3c_masterdev_groups, }; +static void i3c_master_shutdown(struct i3c_master_controller *master) +{ + i3c_bus_maintenance_lock(&master->bus); + master->shutting_down = true; + i3c_bus_maintenance_unlock(&master->bus); + + cancel_work_sync(&master->hj_work); +} + +static void i3c_device_shutdown(struct device *dev) +{ + if (dev->type == &i3c_masterdev_type) + i3c_master_shutdown(dev_to_i3cmaster(dev)); +} + +const struct bus_type i3c_bus_type = { + .name = "i3c", + .match = i3c_device_match, + .probe = i3c_device_probe, + .remove = i3c_device_remove, + .shutdown = i3c_device_shutdown, +}; +EXPORT_SYMBOL_GPL(i3c_bus_type); + static int i3c_bus_set_mode(struct i3c_bus *i3cbus, enum i3c_bus_mode mode, unsigned long max_i2c_scl_rate) { @@ -1846,10 +1865,13 @@ int i3c_master_do_daa_ext(struct i3c_master_controller *master, bool rstdaa) i3c_bus_maintenance_lock(&master->bus); - if (rstdaa) - rstret = i3c_master_rstdaa_locked(master, I3C_BROADCAST_ADDR); - - ret = master->ops->do_daa(master); + if (master->shutting_down) { + ret = -ENODEV; + } else { + if (rstdaa) + rstret = i3c_master_rstdaa_locked(master, I3C_BROADCAST_ADDR); + ret = master->ops->do_daa(master); + } i3c_bus_maintenance_unlock(&master->bus); @@ -3166,7 +3188,7 @@ EXPORT_SYMBOL_GPL(i3c_master_register); void i3c_master_unregister(struct i3c_master_controller *master) { i3c_bus_notify(&master->bus, I3C_NOTIFY_BUS_REMOVE); - cancel_work_sync(&master->hj_work); + i3c_master_shutdown(master); if (master->ops->set_dev_nack_retry) device_remove_file(&master->dev, &dev_attr_dev_nack_retry_count); diff --git a/include/linux/i3c/master.h b/include/linux/i3c/master.h index eb5c51608bd7..77e63082b06e 100644 --- a/include/linux/i3c/master.h +++ b/include/linux/i3c/master.h @@ -511,6 +511,7 @@ struct i3c_master_controller_ops { * @hotjoin: true if the master support hotjoin * @rpm_allowed: true if Runtime PM allowed * @rpm_ibi_allowed: true if IBI and Hot-Join allowed while runtime suspended + * @shutting_down: set to true when master begins shutdown or unregister * @boardinfo.i3c: list of I3C boardinfo objects * @boardinfo.i2c: list of I2C boardinfo objects * @boardinfo: board-level information attached to devices connected on the bus @@ -539,6 +540,7 @@ struct i3c_master_controller { unsigned int hotjoin: 1; unsigned int rpm_allowed: 1; unsigned int rpm_ibi_allowed: 1; + bool shutting_down; struct { struct list_head i3c; struct list_head i2c; -- 2.51.0 -- linux-i3c mailing list linux-i3c@lists.infradead.org http://lists.infradead.org/mailman/listinfo/linux-i3c