mirror of
https://github.com/OpenVoiceOS/OpenVoiceOS
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66 lines
1.9 KiB
Diff
66 lines
1.9 KiB
Diff
From 69c33032523d64d63f4abe3b13cac622ada89cd5 Mon Sep 17 00:00:00 2001
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From: John Ogness <john.ogness@linutronix.de>
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Date: Tue, 26 Sep 2023 13:04:15 +0000
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Subject: [PATCH 152/195] printk: nbcon: Stop threads on shutdown/reboot
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Register a syscore_ops shutdown function to stop all threaded
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printers on shutdown/reboot. This allows printk to transition back
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to atomic printing in order to provide a robust mechanism for
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outputting the final messages.
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Signed-off-by: John Ogness <john.ogness@linutronix.de>
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Signed-off-by: Sebastian Andrzej Siewior <bigeasy@linutronix.de>
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---
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kernel/printk/nbcon.c | 31 +++++++++++++++++++++++++++++++
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1 file changed, 31 insertions(+)
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diff --git a/kernel/printk/nbcon.c b/kernel/printk/nbcon.c
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index 337ec7a10095..57ed4968a653 100644
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--- a/kernel/printk/nbcon.c
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+++ b/kernel/printk/nbcon.c
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@@ -8,6 +8,7 @@
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#include <linux/kthread.h>
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#include <linux/slab.h>
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#include <linux/serial_core.h>
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+#include <linux/syscore_ops.h>
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#include "printk_ringbuffer.h"
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#include "internal.h"
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/*
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@@ -1577,3 +1578,33 @@ void nbcon_release(struct uart_port *up)
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con->locked_port = false;
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}
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EXPORT_SYMBOL_GPL(nbcon_release);
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+
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+/**
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+ * printk_kthread_shutdown - shutdown all threaded printers
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+ *
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+ * On system shutdown all threaded printers are stopped. This allows printk
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+ * to transition back to atomic printing, thus providing a robust mechanism
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+ * for the final shutdown/reboot messages to be output.
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+ */
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+static void printk_kthread_shutdown(void)
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+{
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+ struct console *con;
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+
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+ console_list_lock();
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+ for_each_console(con) {
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+ if (con->flags & CON_NBCON)
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+ nbcon_kthread_stop(con);
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+ }
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+ console_list_unlock();
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+}
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+
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+static struct syscore_ops printk_syscore_ops = {
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+ .shutdown = printk_kthread_shutdown,
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+};
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+
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+static int __init printk_init_ops(void)
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+{
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+ register_syscore_ops(&printk_syscore_ops);
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+ return 0;
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+}
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+device_initcall(printk_init_ops);
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--
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2.43.0
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