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mx.microsoft.com 1; spf=pass smtp.mailfrom=windriver.com; dmarc=pass action=none header.from=windriver.com; dkim=pass header.d=windriver.com; arc=none Received: from MW5PR11MB5764.namprd11.prod.outlook.com (2603:10b6:303:197::8) by MW4PR11MB6981.namprd11.prod.outlook.com (2603:10b6:303:229::20) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384) id 15.20.8230.11; Tue, 10 Dec 2024 03:42:42 +0000 Received: from MW5PR11MB5764.namprd11.prod.outlook.com ([fe80::3c2c:a17f:2516:4dc8]) by MW5PR11MB5764.namprd11.prod.outlook.com ([fe80::3c2c:a17f:2516:4dc8%7]) with mapi id 15.20.8230.010; Tue, 10 Dec 2024 03:42:42 +0000 From: Xiaolei Wang To: l.stach@pengutronix.de, gregkh@linuxfoundation.org, jirislaby@kernel.org, shawnguo@kernel.org, s.hauer@pengutronix.de, kernel@pengutronix.de, festevam@gmail.com, esben@geanix.com, marex@denx.de, ilpo.jarvinen@linux.intel.com, linux@rasmusvillemoes.dk, stefan.eichenberger@toradex.com, l.sanfilippo@kunbus.com, cniedermaier@dh-electronics.com, rickaran@axis.com, xiaolei.wang@windriver.com Cc: linux-kernel@vger.kernel.org, linux-serial@vger.kernel.org, imx@lists.linux.dev, linux-arm-kernel@lists.infradead.org Subject: [PATCH v2] serial: imx: Use uart_port_lock_irq() instead of uart_port_lock() Date: Tue, 10 Dec 2024 11:42:23 +0800 Message-Id: <20241210034223.1493522-1-xiaolei.wang@windriver.com> X-Mailer: git-send-email 2.25.1 X-ClientProxiedBy: SG2PR02CA0069.apcprd02.prod.outlook.com (2603:1096:4:54::33) To MW5PR11MB5764.namprd11.prod.outlook.com (2603:10b6:303:197::8) MIME-Version: 1.0 X-MS-PublicTrafficType: Email X-MS-TrafficTypeDiagnostic: MW5PR11MB5764:EE_|MW4PR11MB6981:EE_ X-MS-Office365-Filtering-Correlation-Id: a5580fa6-d24c-4769-2448-08dd18ccb38e X-MS-Exchange-SenderADCheck: 1 X-MS-Exchange-AntiSpam-Relay: 0 X-Microsoft-Antispam: BCL:0;ARA:13230040|366016|1800799024|52116014|7416014|376014|921020|38350700014; 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Since there is output during the serial port entering the suspend process, the suspend will be interrupted, resulting in the nesting of locks. Therefore, use uart_port_lock_irq() instead of uart_port_unlock(). WARNING: inconsistent lock state 6.12.0-rc2-00002-g3c199ed5bd64-dirty #23 Not tainted -------------------------------- inconsistent {IN-HARDIRQ-W} -> {HARDIRQ-ON-W} usage. sh/494 [HC0[0]:SC0[0]:HE1:SE1] takes: c4db5850 (&port_lock_key){?.-.}-{3:3}, at: imx_uart_enable_wakeup+0x14/0x254 {IN-HARDIRQ-W} state was registered at: lock_acquire+0x104/0x348 _raw_spin_lock+0x48/0x84 imx_uart_int+0x14/0x4dc __handle_irq_event_percpu+0xac/0x2fc handle_irq_event_percpu+0xc/0x40 handle_irq_event+0x38/0x8c handle_fasteoi_irq+0xb4/0x1b8 handle_irq_desc+0x1c/0x2c gic_handle_irq+0x6c/0xa0 generic_handle_arch_irq+0x2c/0x64 call_with_stack+0x18/0x20 __irq_svc+0x9c/0xbc _raw_spin_unlock_irqrestore+0x2c/0x48 uart_write+0xd8/0x3a0 do_output_char+0x1a8/0x1e4 n_tty_write+0x224/0x440 file_tty_write.constprop.0+0x124/0x250 do_iter_readv_writev+0x100/0x1e0 vfs_writev+0xc4/0x448 do_writev+0x68/0xf8 ret_fast_syscall+0x0/0x1c irq event stamp: 31593 hardirqs last enabled at (31593): [] _raw_spin_unlock_irqrestore+0x44/0x48 hardirqs last disabled at (31592): [] clk_enable_lock+0x60/0x120 softirqs last enabled at (30334): [] handle_softirqs+0x2cc/0x478 softirqs last disabled at (30325): [] __irq_exit_rcu+0x120/0x15c other info that might help us debug this: Possible unsafe locking scenario: CPU0 ---- lock(&port_lock_key); lock(&port_lock_key); Fixes: 3c199ed5bd64 ("serial: imx: Grab port lock in imx_uart_enable_wakeup()") Signed-off-by: Xiaolei Wang Reviewed-by: Lucas Stach Reviewed-by: Fabio Estevam --- v1: https://patchwork.kernel.org/project/linux-arm-kernel/patch/20241209124732.693834-1-xiaolei.wang@windriver.com/ v2: use uart_port_lock_irq() instead of uart_port_lock_irqsave() drivers/tty/serial/imx.c | 4 ++-- 1 file changed, 2 insertions(+), 2 deletions(-) diff --git a/drivers/tty/serial/imx.c b/drivers/tty/serial/imx.c index 17f70e4bee43..9c59ec128bb4 100644 --- a/drivers/tty/serial/imx.c +++ b/drivers/tty/serial/imx.c @@ -2692,7 +2692,7 @@ static void imx_uart_enable_wakeup(struct imx_port *sport, bool on) { u32 ucr3; - uart_port_lock(&sport->port); + uart_port_lock_irq(&sport->port); ucr3 = imx_uart_readl(sport, UCR3); if (on) { @@ -2714,7 +2714,7 @@ static void imx_uart_enable_wakeup(struct imx_port *sport, bool on) imx_uart_writel(sport, ucr1, UCR1); } - uart_port_unlock(&sport->port); + uart_port_unlock_irq(&sport->port); } static int imx_uart_suspend_noirq(struct device *dev)