diff options
Diffstat (limited to 'kernel/printk')
| -rw-r--r-- | kernel/printk/printk.c | 10 |
1 files changed, 10 insertions, 0 deletions
diff --git a/kernel/printk/printk.c b/kernel/printk/printk.c index f04bbed0aa79..e83c12770104 100644 --- a/kernel/printk/printk.c +++ b/kernel/printk/printk.c @@ -1847,6 +1847,16 @@ static int console_trylock_spinning(void) if (console_trylock()) return 1; + /* + * It's unsafe to spin once a panic has begun. If we are the + * panic CPU, we may have already halted the owner of the + * console_sem. If we are not the panic CPU, then we should + * avoid taking console_sem, so the panic CPU has a better + * chance of cleanly acquiring it later. + */ + if (panic_in_progress()) + return 0; + printk_safe_enter_irqsave(flags); raw_spin_lock(&console_owner_lock); |