serial8250: Mark console as CON_ANYTIME

While trying to debug a cpu-hotplug issue I noticed printk() stopped
working once the cpu got marked offline, since the 8250 serial console
doesn't have any per-cpu resources the CON_ANYTIME bit is the safe and
documented way to make it work again.

Signed-off-by: Peter Zijlstra <a.p.zijlstra@chello.nl>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>

diff --git a/drivers/serial/8250.c b/drivers/serial/8250.c
index 4d8e14b..09a5508 100644 (file)
--- a/drivers/serial/8250.c
+++ b/drivers/serial/8250.c
@@ -2872,7 +2872,7 @@ static struct console serial8250_console = {
        .device         = uart_console_device,
        .setup          = serial8250_console_setup,
        .early_setup    = serial8250_console_early_setup,
-       .flags          = CON_PRINTBUFFER,
+       .flags          = CON_PRINTBUFFER | CON_ANYTIME,
        .index          = -1,
        .data           = &serial8250_reg,
 };