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Subject[PATCH 1/2] serial: st-asc: Don't call BUG in asc_console_setup()
In order to prevent an asc instance to be used as early console, BUG_ON is
used on either mapbase or membase being NULL.

Problem is that this condition is also true when we set console to be a ttyASx
different to the first asc instance being probed.

Instead of calling BUG_ON, it now returns -ENXIO when either mapbase or
membase is NULL.

Signed-off-by: Maxime Coquelin <>
drivers/tty/serial/st-asc.c | 3 ++-
1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/drivers/tty/serial/st-asc.c b/drivers/tty/serial/st-asc.c
index f48b1cc..2369bc0 100644
--- a/drivers/tty/serial/st-asc.c
+++ b/drivers/tty/serial/st-asc.c
@@ -849,7 +849,8 @@ static int asc_console_setup(struct console *co, char *options)
* this to be called during the uart port registration when the
* driver gets probed and the port should be mapped at that point.
- BUG_ON(ascport->port.mapbase == 0 || ascport->port.membase == NULL);
+ if (ascport->port.mapbase == 0 || ascport->port.membase == NULL)
+ return -ENXIO;

if (options)
uart_parse_options(options, &baud, &parity, &bits, &flow);

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