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Tue, 4 Aug 2026 16:53:44 +0000 Message-ID: <097979c7-cb32-42d4-b1e1-00db4ce39160@intel.com> Date: Tue, 4 Aug 2026 19:53:40 +0300 User-Agent: Mozilla Thunderbird Subject: Re: [PATCH 2/5] i3c: master: Fix refcount of i3c fwnode To: Akhil R , Alexandre Belloni , Frank Li , , References: <20260804101301.2975911-1-akhilrajeev@nvidia.com> <20260804101301.2975911-3-akhilrajeev@nvidia.com> Content-Language: en-US From: Adrian Hunter 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 In-Reply-To: <20260804101301.2975911-3-akhilrajeev@nvidia.com> X-ClientProxiedBy: DU2PR04CA0261.eurprd04.prod.outlook.com (2603:10a6:10:28e::26) To IA1PR11MB7198.namprd11.prod.outlook.com (2603:10b6:208:419::15) MIME-Version: 1.0 X-MS-PublicTrafficType: Email X-MS-TrafficTypeDiagnostic: IA1PR11MB7198:EE_|DSWPR11MB9558:EE_ X-MS-Office365-Filtering-Correlation-Id: 598f5d07-6fa6-48d9-40da-08def248f202 X-MS-Exchange-SenderADCheck: 1 X-MS-Exchange-AntiSpam-Relay: 0 X-Microsoft-Antispam: BCL:0;ARA:13230040|376014|366016|1800799024|23010399003|22082099003|18002099003|4143699003|11063799006|56012099006|10067099003; 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charset="us-ascii" Content-Transfer-Encoding: 7bit Sender: "linux-i3c" Errors-To: linux-i3c-bounces+linux-i3c=archiver.kernel.org@lists.infradead.org On 04/08/2026 13:12, Akhil R wrote: > i3c_master_add_i3c_boardinfo() takes a reference on the firmware node of > every i3c child described for the bus and never drops it, while > i3c_device_release() drops one that the device never took, as > i3c_master_register_new_i3c_devs() assigns the node of the boardinfo as > is. > > The two mistakes cancel out for a device that is registered exactly once, > which is why the imbalance goes unnoticed. Register it again, as happens I think it is (potentially repeated) registration failure path > when the bus is re-initialised, and the count underflows, so the node may > be freed while the boardinfo still refers to it. A child that never joins > the bus leaks its reference instead. > > Take a reference where the node is handed to the device, so that the one > the release callback drops is balanced, and drop the reference of the > boardinfo with a device managed action, as it is done for the i2c > boardinfo. > > Fixes: 3a379bbcea0a ("i3c: Add core I3C infrastructure") > Reported-by: Adrian Hunter > Closes: https://lore.kernel.org/all/97465893-3650-4f37-98b7-1db76fc6fd03@intel.com/ > Assisted-by: Cursor:claude-opus-5 > Signed-off-by: Akhil R Cosmetic suggestion below, nevertheless: Reviewed-by: Adrian Hunter > --- > drivers/i3c/master.c | 6 ++++-- > 1 file changed, 4 insertions(+), 2 deletions(-) > > diff --git a/drivers/i3c/master.c b/drivers/i3c/master.c > index 08dc10f172aa..568788e4cdb5 100644 > --- a/drivers/i3c/master.c > +++ b/drivers/i3c/master.c > @@ -2102,7 +2102,8 @@ i3c_master_register_new_i3c_devs(struct i3c_master_controller *master) > desc->info.static_addr); > > if (desc->boardinfo) > - device_set_node(&desc->dev->dev, desc->boardinfo->fwnode); > + device_set_node(&desc->dev->dev, > + fwnode_handle_get(desc->boardinfo->fwnode)); > > ret = device_register(&desc->dev->dev); > if (ret) { > @@ -2994,7 +2995,8 @@ i3c_master_add_i3c_boardinfo(struct i3c_master_controller *master, > boardinfo->fwnode = fwnode_handle_get(fwnode); > list_add_tail(&boardinfo->node, &master->boardinfo.i3c); > > - return 0; > + return devm_add_action_or_reset(dev, i3c_master_put_boardinfo_fwnode, > + fwnode); I'd suggest wrapping at 100 cols rather than 80. > } > > static int i3c_master_add_of_dev(struct i3c_master_controller *master, -- linux-i3c mailing list linux-i3c@lists.infradead.org http://lists.infradead.org/mailman/listinfo/linux-i3c