diff options
| -rw-r--r-- | kernel/printk/nbcon.c | 2 | ||||
| -rw-r--r-- | kernel/printk/printk.c | 23 |
2 files changed, 23 insertions, 2 deletions
diff --git a/kernel/printk/nbcon.c b/kernel/printk/nbcon.c index 558ef3177976..73f315fd97a3 100644 --- a/kernel/printk/nbcon.c +++ b/kernel/printk/nbcon.c @@ -1849,7 +1849,7 @@ void nbcon_device_release(struct console *con) if (console_trylock()) console_unlock(); } else if (ft.legacy_offload) { - printk_trigger_flush(); + defer_console_output(); } } console_srcu_read_unlock(cookie); diff --git a/kernel/printk/printk.c b/kernel/printk/printk.c index 5aee9ffb16b9..dc89239cf1b5 100644 --- a/kernel/printk/printk.c +++ b/kernel/printk/printk.c @@ -4567,9 +4567,30 @@ void defer_console_output(void) __wake_up_klogd(PRINTK_PENDING_WAKEUP | PRINTK_PENDING_OUTPUT); } +/** + * printk_trigger_flush - Attempt to flush printk buffer to consoles. + * + * If possible, flush the printk buffer to all consoles in the caller's + * context. If offloading is available, trigger deferred printing. + * + * This is best effort. Depending on the system state, console states, + * and caller context, no actual flushing may result from this call. + */ void printk_trigger_flush(void) { - defer_console_output(); + struct console_flush_type ft; + + printk_get_console_flush_type(&ft); + if (ft.nbcon_atomic) + nbcon_atomic_flush_pending(); + if (ft.nbcon_offload) + nbcon_kthreads_wake(); + if (ft.legacy_direct) { + if (console_trylock()) + console_unlock(); + } + if (ft.legacy_offload) + defer_console_output(); } int vprintk_deferred(const char *fmt, va_list args) |