[PATCH printk 09/18] serial: kgdboc: Lock console list in probe function

[John Ogness]

From: Thomas Gleixner <tglx@xxxxxxxxxxxxx>

Unprotected list walks are not necessarily safe.

Signed-off-by: Thomas Gleixner <tglx@xxxxxxxxxxxxx>
Signed-off-by: John Ogness <john.ogness@xxxxxxxxxxxxx>
Reviewed-by: Sergey Senozhatsky <senozhatsky@xxxxxxxxxxxx>
---
 drivers/tty/serial/kgdboc.c | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/drivers/tty/serial/kgdboc.c b/drivers/tty/serial/kgdboc.c
index 79b7db8580e0..af2aa76bae15 100644
--- a/drivers/tty/serial/kgdboc.c
+++ b/drivers/tty/serial/kgdboc.c
@@ -193,7 +193,8 @@ static int configure_kgdboc(void)
 	if (!p)
 		goto noconfig;
 
-	for_each_console(cons) {
+	console_list_lock();
+	for_each_registered_console(cons) {
 		int idx;
 		if (cons->device && cons->device(cons, &idx) == p &&
 		    idx == tty_line) {
@@ -201,6 +202,7 @@ static int configure_kgdboc(void)
 			break;
 		}
 	}
+	console_list_unlock();
 
 	kgdb_tty_driver = p;
 	kgdb_tty_line = tty_line;
-- 
2.30.2