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Flag port locked by nbcon should be saved in uart_port structure instead of in console structure. Fixes: 6424f396c49e ("printk: nbcon: Implement processing in port->lock wrapper") Suggested-by: John Ogness Signed-off-by: Junxiao Chang Reviewed-by: John Ogness --- include/linux/console.h | 2 -- include/linux/serial_core.h | 1 + kernel/printk/nbcon.c | 8 ++++---- 3 files changed, 5 insertions(+), 6 deletions(-) diff --git a/include/linux/console.h b/include/linux/console.h index f8a0628678886..1eb9580e9b18a 100644 --- a/include/linux/console.h +++ b/include/linux/console.h @@ -304,7 +304,6 @@ struct nbcon_write_context { * @nbcon_state: State for nbcon consoles * @nbcon_seq: Sequence number of the next record for nbcon to print * @pbufs: Pointer to nbcon private buffer - * @locked_port: True, if the port lock is locked by nbcon * @kthread: Printer kthread for this console * @rcuwait: RCU-safe wait object for @kthread waking * @irq_work: Defer @kthread waking to IRQ work context @@ -338,7 +337,6 @@ struct console { atomic_t __private nbcon_state; atomic_long_t __private nbcon_seq; struct printk_buffers *pbufs; - bool locked_port; struct task_struct *kthread; struct rcuwait rcuwait; struct irq_work irq_work; diff --git a/include/linux/serial_core.h b/include/linux/serial_core.h index 245c11753effd..b2221a50fcb29 100644 --- a/include/linux/serial_core.h +++ b/include/linux/serial_core.h @@ -488,6 +488,7 @@ struct uart_port { struct uart_icount icount; /* statistics */ struct console *cons; /* struct console, if any */ + bool nbcon_locked_port; /* True, if the port is locked by nbcon */ /* flags must be updated while holding port mutex */ upf_t flags; diff --git a/kernel/printk/nbcon.c b/kernel/printk/nbcon.c index 1b1b585b1675b..b53d93585ee71 100644 --- a/kernel/printk/nbcon.c +++ b/kernel/printk/nbcon.c @@ -1586,7 +1586,7 @@ void nbcon_acquire(struct uart_port *up) if (!uart_is_nbcon(up)) return; - WARN_ON_ONCE(con->locked_port); + WARN_ON_ONCE(up->nbcon_locked_port); do { do { @@ -1597,7 +1597,7 @@ void nbcon_acquire(struct uart_port *up) } while (!nbcon_context_enter_unsafe(&ctxt)); - con->locked_port = true; + up->nbcon_locked_port = true; } EXPORT_SYMBOL_GPL(nbcon_acquire); @@ -1623,13 +1623,13 @@ void nbcon_release(struct uart_port *up) .prio = NBCON_PRIO_NORMAL, }; - if (!con->locked_port) + if (!up->nbcon_locked_port) return; if (nbcon_context_exit_unsafe(&ctxt)) nbcon_context_release(&ctxt); - con->locked_port = false; + up->nbcon_locked_port = false; } EXPORT_SYMBOL_GPL(nbcon_release); From patchwork Tue Jan 23 05:40:33 2024 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: "Chang, Junxiao" X-Patchwork-Id: 190711 Return-Path: Delivered-To: ouuuleilei@gmail.com Received: by 2002:a05:7300:2553:b0:103:945f:af90 with SMTP id p19csp137258dyi; Mon, 22 Jan 2024 21:44:49 -0800 (PST) X-Google-Smtp-Source: AGHT+IEr9Hr+bs7Czqq+GVbTY8W+cvX1yqsjGbSMghCM8rD2vYwLKhkgGTk/H9SKtPTNgUOQ8z3m X-Received: by 2002:a05:6a00:23d5:b0:6d9:a074:659f with SMTP id g21-20020a056a0023d500b006d9a074659fmr7913016pfc.13.1705988688968; Mon, 22 Jan 2024 21:44:48 -0800 (PST) ARC-Seal: i=2; a=rsa-sha256; t=1705988688; cv=pass; d=google.com; s=arc-20160816; b=Apkt4Mm77sqpnyFQxVy+/zMH9pln1Wmcf4otg1xR7SqRBcJD2up5tLf8BA2L9BhxRe bw+bYYo3Wvz9EkWPgj5/r7KzCbAdHWdax07wZBgmO6OOYQXvy2o+retR7+DRPgkWdGh1 UkpYqMT0nXizwGjzqjHjiHOM8mCXv7wVktv0wcdgNBrx5FsuwLZpI5tge952wFgaspVq 5i/FrEuiOaCPPfTk/4d8u+1eZaDsNqgTwXj8Aa8j2Q36Q9M9ywsNdud2OWUXGOeM/LHg uriaWCGvjvxfCJqFKs1aGEOcjvAekpIsd9e4aOhyduY3pWfFBKrQV/wrMdlrxpm7bPKB knLg== ARC-Message-Signature: i=2; a=rsa-sha256; c=relaxed/relaxed; d=google.com; s=arc-20160816; h=content-transfer-encoding:mime-version:list-unsubscribe :list-subscribe:list-id:precedence:references:in-reply-to:message-id :date:subject:cc:to:from:dkim-signature; bh=XYb9NVWgkQg/qd2NKo6NwvmLgZ5sSeXdTBd2KFiD0MU=; fh=3n9yk9H0aP61VWOkjV8qJHqEh2nN7MsL3m9A3XvFOBk=; b=BsF9C9Jhtj7GJOPRLsI2+Ql7XGA/flUzTxDk6KcDy0T2AEL0Li1i5VQW6RgpW/Wp7/ 4NI7FeIy/Cy1TsH6DQ9R9MBk3G7J/yPZQWRfa7DHomxEzZ6BUvPL9M6Nf3C5DppsOoBe 6adYCQhBLR0ANs7sLNIbL4icdp4jr/HydvM/RIt94G66wgxsgYhjPPqUzwgUeGKxyjOp 0NtztE7LLNifRcIziUt59vq5sBZRfYmh+p0Q/NuzJaS8ImNa7bAi5GWmjAI1HGgO1mGq qY+xq/x0Nt7K9GkMroZRPTkXaq1F5DXH/4BCus6jkYar5gb9TSqSqFlzjsIx1oEcSqa8 59lA== ARC-Authentication-Results: i=2; mx.google.com; dkim=pass header.i=@intel.com header.s=Intel header.b=IWC6hzHt; arc=pass (i=1 spf=pass spfdomain=intel.com dkim=pass dkdomain=intel.com dmarc=pass fromdomain=intel.com); spf=pass (google.com: domain of linux-kernel+bounces-34730-ouuuleilei=gmail.com@vger.kernel.org designates 2604:1380:40f1:3f00::1 as permitted sender) smtp.mailfrom="linux-kernel+bounces-34730-ouuuleilei=gmail.com@vger.kernel.org"; dmarc=pass (p=NONE sp=NONE dis=NONE) header.from=intel.com Received: from sy.mirrors.kernel.org (sy.mirrors.kernel.org. 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bh=gdiyFjvMqWMG/af6i2COjazfjxZBQgaYcm1PP8azrvk=; b=IWC6hzHt+hGgDxM8mnhmOKjK757opWdvGQIPrJ3S1sCrDPlWBKRCNmyI WkGNJg1nbwrHGt0hybHhtSNKtWLhEcm1GOdFE6qIUV5EwZNj3Q1o5BAt9 FWKtG/ludALKUDMf4YAMM+By83qOCitlD3yGyrrHi9ZzIdJprr8XHxyXa npxwAFEokZiWIetHfUHRqzC54fEfMtHWKtt/xQ21kPIr/6WZX6hvgJ4WN 6CCgWYvGTQuC6+duNL7wvvSsWTgbdfhYjVn2jQa0TDFo+2NopWKIuscQ9 uX+ctZsI+4jgHf/75tq1fX5Zv4NGM8tVCJKtFll+SYteqZsQeKimV+oeW A==; X-IronPort-AV: E=McAfee;i="6600,9927,10961"; a="14770175" X-IronPort-AV: E=Sophos;i="6.05,213,1701158400"; d="scan'208";a="14770175" Received: from fmviesa003.fm.intel.com ([10.60.135.143]) by orvoesa102.jf.intel.com with ESMTP/TLS/ECDHE-RSA-AES256-GCM-SHA384; 22 Jan 2024 21:40:51 -0800 X-ExtLoop1: 1 X-IronPort-AV: E=Sophos;i="6.05,213,1701158400"; d="scan'208";a="1472008" Received: from junxiaochang.bj.intel.com ([10.238.157.86]) by fmviesa003-auth.fm.intel.com with ESMTP/TLS/ECDHE-RSA-AES256-GCM-SHA384; 22 Jan 2024 21:40:47 -0800 From: Junxiao Chang To: bigeasy@linutronix.de, tglx@linutronix.de, rostedt@goodmis.org, linux-kernel@vger.kernel.org Cc: john.ogness@linutronix.de, hao3.li@intel.com, lili.li@intel.com, jianfeng.gao@intel.com, linux-rt-users@vger.kernel.org Subject: [PATCH 2/2] printk: nbcon: check uart port is nbcon or not in nbcon_release Date: Tue, 23 Jan 2024 13:40:33 +0800 Message-Id: <20240123054033.183114-3-junxiao.chang@intel.com> X-Mailer: git-send-email 2.34.1 In-Reply-To: <20240123054033.183114-1-junxiao.chang@intel.com> References: <20240123054033.183114-1-junxiao.chang@intel.com> Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 X-getmail-retrieved-from-mailbox: INBOX X-GMAIL-THRID: 1788319507926157549 X-GMAIL-MSGID: 1788858795651105953 Try to release nbcon only if current uart port is nbcon, as it does in nbcon_acquire. Signed-off-by: Junxiao Chang --- kernel/printk/nbcon.c | 3 +++ 1 file changed, 3 insertions(+) diff --git a/kernel/printk/nbcon.c b/kernel/printk/nbcon.c index b53d93585ee71..d8c6f30adde8b 100644 --- a/kernel/printk/nbcon.c +++ b/kernel/printk/nbcon.c @@ -1623,6 +1623,9 @@ void nbcon_release(struct uart_port *up) .prio = NBCON_PRIO_NORMAL, }; + if (!uart_is_nbcon(up)) + return; + if (!up->nbcon_locked_port) return;