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Wed, 15 Sep 2021 08:10:18 +0000 From: laurentiu.tudor@nxp.com To: andriy.shevchenko@linux.intel.com, heikki.krogerus@linux.intel.com, gregkh@linuxfoundation.org, rafael@kernel.org, linux-acpi@vger.kernel.org, linux-kernel@vger.kernel.org Cc: jon@solid-run.com, Laurentiu Tudor , stable@vger.kernel.org Subject: [PATCH v3] software node: balance refcount for managed sw nodes Date: Wed, 15 Sep 2021 11:09:39 +0300 Message-Id: <20210915080939.21388-1-laurentiu.tudor@nxp.com> X-Mailer: git-send-email 2.17.1 X-ClientProxiedBy: AM3PR07CA0097.eurprd07.prod.outlook.com (2603:10a6:207:6::31) To VI1PR0402MB3405.eurprd04.prod.outlook.com (2603:10a6:803:3::26) MIME-Version: 1.0 X-MS-Exchange-MessageSentRepresentingType: 1 Received: from fsr-ub1864-101.ea.freescale.net (92.120.5.2) by AM3PR07CA0097.eurprd07.prod.outlook.com (2603:10a6:207:6::31) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384) id 15.20.4523.8 via Frontend Transport; Wed, 15 Sep 2021 08:10:17 +0000 X-MS-PublicTrafficType: Email X-MS-Office365-Filtering-Correlation-Id: e996c16b-5f2f-4c44-0ea4-08d978204183 X-MS-TrafficTypeDiagnostic: VI1PR04MB7085: X-MS-Exchange-Transport-Forked: True X-Microsoft-Antispam-PRVS: X-MS-Oob-TLC-OOBClassifiers: OLM:4502; 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X-MS-Exchange-AntiSpam-MessageData-ChunkCount: 1 X-MS-Exchange-AntiSpam-MessageData-0: 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 X-OriginatorOrg: nxp.com X-MS-Exchange-CrossTenant-Network-Message-Id: e996c16b-5f2f-4c44-0ea4-08d978204183 X-MS-Exchange-CrossTenant-AuthSource: VI1PR0402MB3405.eurprd04.prod.outlook.com X-MS-Exchange-CrossTenant-AuthAs: Internal X-MS-Exchange-CrossTenant-OriginalArrivalTime: 15 Sep 2021 08:10:18.4839 (UTC) X-MS-Exchange-CrossTenant-FromEntityHeader: Hosted X-MS-Exchange-CrossTenant-Id: 686ea1d3-bc2b-4c6f-a92c-d99c5c301635 X-MS-Exchange-CrossTenant-MailboxType: HOSTED X-MS-Exchange-CrossTenant-UserPrincipalName: JsLdenZLODDAcEBdCgMbRwykjSOB9UTvzwK82RN2zNiakNqiIHUj6IZE0aeW6/H8+G5B+c6c0m3HHVcxjOKqdw== X-MS-Exchange-Transport-CrossTenantHeadersStamped: VI1PR04MB7085 Precedence: bulk List-ID: X-Mailing-List: linux-acpi@vger.kernel.org From: Laurentiu Tudor software_node_notify(), on KOBJ_REMOVE drops the refcount twice on managed software nodes, thus leading to underflow errors. Balance the refcount by bumping it in the device_create_managed_software_node() function. The error [1] was encountered after adding a .shutdown() op to our fsl-mc-bus driver. [1] pc : refcount_warn_saturate+0xf8/0x150 lr : refcount_warn_saturate+0xf8/0x150 sp : ffff80001009b920 x29: ffff80001009b920 x28: ffff1a2420318000 x27: 0000000000000000 x26: ffffccac15e7a038 x25: 0000000000000008 x24: ffffccac168e0030 x23: ffff1a2428a82000 x22: 0000000000080000 x21: ffff1a24287b5000 x20: 0000000000000001 x19: ffff1a24261f4400 x18: ffffffffffffffff x17: 6f72645f726f7272 x16: 0000000000000000 x15: ffff80009009b607 x14: 0000000000000000 x13: ffffccac16602670 x12: 0000000000000a17 x11: 000000000000035d x10: ffffccac16602670 x9 : ffffccac16602670 x8 : 00000000ffffefff x7 : ffffccac1665a670 x6 : ffffccac1665a670 x5 : 0000000000000000 x4 : 0000000000000000 x3 : 00000000ffffffff x2 : 0000000000000000 x1 : 0000000000000000 x0 : ffff1a2420318000 Call trace: refcount_warn_saturate+0xf8/0x150 kobject_put+0x10c/0x120 software_node_notify+0xd8/0x140 device_platform_notify+0x4c/0xb4 device_del+0x188/0x424 fsl_mc_device_remove+0x2c/0x4c rebofind sp.c__fsl_mc_device_remove+0x14/0x2c device_for_each_child+0x5c/0xac dprc_remove+0x9c/0xc0 fsl_mc_driver_remove+0x28/0x64 __device_release_driver+0x188/0x22c device_release_driver+0x30/0x50 bus_remove_device+0x128/0x134 device_del+0x16c/0x424 fsl_mc_bus_remove+0x8c/0x114 fsl_mc_bus_shutdown+0x14/0x20 platform_shutdown+0x28/0x40 device_shutdown+0x15c/0x330 __do_sys_reboot+0x218/0x2a0 __arm64_sys_reboot+0x28/0x34 invoke_syscall+0x48/0x114 el0_svc_common+0x40/0xdc do_el0_svc+0x2c/0x94 el0_svc+0x2c/0x54 el0t_64_sync_handler+0xa8/0x12c el0t_64_sync+0x198/0x19c ---[ end trace 32eb1c71c7d86821 ]--- Fixes: 151f6ff78cdf ("software node: Provide replacement for device_add_properties()") Reported-by: Jon Nettleton Suggested-by: Heikki Krogerus Reviewed-by: Heikki Krogerus Signed-off-by: Laurentiu Tudor Cc: stable@vger.kernel.org --- Changes since v2: - added Fixes: tag - Cc-ed stable Changes since v1: - added Heikki's Reviewed-by: (Thanks!) Changes since RFC: - use software_node_notify(KOBJ_ADD) instead of directly bumping refcount (Heikki) drivers/base/swnode.c | 3 +++ 1 file changed, 3 insertions(+) diff --git a/drivers/base/swnode.c b/drivers/base/swnode.c index d1f1a8240120..bdb50a06c82a 100644 --- a/drivers/base/swnode.c +++ b/drivers/base/swnode.c @@ -1113,6 +1113,9 @@ int device_create_managed_software_node(struct device *dev, to_swnode(fwnode)->managed = true; set_secondary_fwnode(dev, fwnode); + if (device_is_registered(dev)) + software_node_notify(dev, KOBJ_ADD); + return 0; } EXPORT_SYMBOL_GPL(device_create_managed_software_node);