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Revert "printk: Wait for the global console lock when the system is going down"

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This reverts commit b87f02307d.

The testing of 5.19 release candidates revealed missing synchronization
between early and regular console functionality.

It would be possible to start the console kthreads later as a workaround.
But it is clear that console lock serialized console drivers between
each other. It opens a big area of possible problems that were not
considered by people involved in the development and review.

printk() is crucial for debugging kernel issues and console output is
very important part of it. The number of consoles is huge and a proper
review would take some time. As a result it need to be reverted for 5.19.

Link: https://lore.kernel.org/r/YrBdjVwBOVgLfHyb@alley
Signed-off-by: Petr Mladek <pmladek@suse.com>
Link: https://lore.kernel.org/r/20220623145157.21938-2-pmladek@suse.com
This commit is contained in:
Petr Mladek
2022-06-23 16:51:52 +02:00
parent b87f02307d
commit 20fb0c8272
6 changed files with 0 additions and 47 deletions
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2
kernel/reboot.c
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@@ -74,7 +74,6 @@ void kernel_restart_prepare(char *cmd)
{
blocking_notifier_call_chain(&reboot_notifier_list, SYS_RESTART, cmd);
system_state = SYSTEM_RESTART;
try_block_console_kthreads(10000);
usermodehelper_disable();
device_shutdown();
}
@@ -263,7 +262,6 @@ static void kernel_shutdown_prepare(enum system_states state)
blocking_notifier_call_chain(&reboot_notifier_list,
(state == SYSTEM_HALT) ? SYS_HALT : SYS_POWER_OFF, NULL);
system_state = state;
try_block_console_kthreads(10000);
usermodehelper_disable();
device_shutdown();
}