linux-kernel - [PATCH 1/2] serial: st-asc: Don't call BUG in asc_console

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Date:	Thu, 24 Jul 2014 14:02:55 +0200
From:	Maxime COQUELIN <maxime.coquelin@...com>
To:	Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
	Jiri Slaby <jslaby@...e.cz>,
	Srinivas Kandagatla <srinivas.kandagatla@...aro.com>,
	Patrice Chotard <patrice.chotard@...com>,
	linux-arm-kernel@...ts.infradead.org, linux-serial@...r.kernel.org,
	linux-kernel@...r.kernel.org
Cc:	kernel@...inux.com, maxime.coquelin@...com
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 <maxime.coquelin@...com>
---
 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);
-- 
1.9.1

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