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Merge tag 'printk-for-5.19-rc3' of git://git.kernel.org/pub/scm/linux/kernel/git/printk/linux

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Pull printk fixes from Petr Mladek:
 "Make the global console_sem available for CPU that is handling panic()
  or shutdown.

  This is an old problem when an existing console lock owner might block
  console output, but it became more visible with the kthreads"

* tag 'printk-for-5.19-rc3' of git://git.kernel.org/pub/scm/linux/kernel/git/printk/linux:
  printk: Wait for the global console lock when the system is going down
  printk: Block console kthreads when direct printing will be required
This commit is contained in:
Linus Torvalds
2022-06-17 14:57:42 -05:00
parent ef06e68290 38335cc5ff
commit 93d17c1c8c
6 changed files with 50 additions and 1 deletions
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2
kernel/reboot.c
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@@ -82,6 +82,7 @@ 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();
}
@@ -270,6 +271,7 @@ 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();
}