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Printk fixup for 5.19-rc7

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Merge tag 'printk-for-5.19-rc7' of git://git.kernel.org/pub/scm/linux/kernel/git/printk/linux

Pull printk fix from Petr Mladek:

 - Make pr_flush() fast when consoles are suspended.

* tag 'printk-for-5.19-rc7' of git://git.kernel.org/pub/scm/linux/kernel/git/printk/linux:
  printk: do not wait for consoles when suspended
This commit is contained in:
Linus Torvalds 2022-07-16 10:46:03 -07:00
commit be9b7b6acf
1 changed files with 11 additions and 2 deletions
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13
kernel/printk/printk.c
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@ -3380,6 +3380,7 @@ static bool __pr_flush(struct console *con, int timeout_ms, bool reset_on_progre
diff = 0;
console_lock();
for_each_console(c) {
if (con && con != c)
continue;
@ -3389,11 +3390,19 @@ static bool __pr_flush(struct console *con, int timeout_ms, bool reset_on_progre
if (printk_seq < seq)
diff += seq - printk_seq;
}
console_unlock();
if (diff != last_diff && reset_on_progress)
/*
* If consoles are suspended, it cannot be expected that they
* make forward progress, so timeout immediately. @diff is
* still used to return a valid flush status.
*/
if (console_suspended)
remaining = 0;
else if (diff != last_diff && reset_on_progress)
remaining = timeout_ms;
console_unlock();
if (diff == 0 || remaining == 0)
break;