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authorWentao Wang <witallwang@gmail.com>2019-03-20 18:30:39 +0300
committerGreg Kroah-Hartman <gregkh@linuxfoundation.org>2019-03-27 18:27:48 +0300
commit3ec8002951ea173e24b466df1ea98c56b7920e63 (patch)
tree0be537f719aac640c343e159aa716f9b65eab3b4 /drivers/tty
parent898a737c8a436b2fcd6dcb0b57775ada2f846a26 (diff)
downloadlinux-3ec8002951ea173e24b466df1ea98c56b7920e63.tar.xz
Disable kgdboc failed by echo space to /sys/module/kgdboc/parameters/kgdboc
Echo "" to /sys/module/kgdboc/parameters/kgdboc will fail with "No such deviceā€ error. This is caused by function "configure_kgdboc" who init err to ENODEV when the config is empty (legal input) the code go out with ENODEV returned. Fixes: 2dd453168643 ("kgdboc: Fix restrict error") Signed-off-by: Wentao Wang <witallwang@gmail.com> Cc: stable <stable@vger.kernel.org> Acked-by: Daniel Thompson <daniel.thompson@linaro.org> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Diffstat (limited to 'drivers/tty')
-rw-r--r--drivers/tty/serial/kgdboc.c4
1 files changed, 3 insertions, 1 deletions
diff --git a/drivers/tty/serial/kgdboc.c b/drivers/tty/serial/kgdboc.c
index 6fb312e7af71..bfe5e9e034ec 100644
--- a/drivers/tty/serial/kgdboc.c
+++ b/drivers/tty/serial/kgdboc.c
@@ -148,8 +148,10 @@ static int configure_kgdboc(void)
char *cptr = config;
struct console *cons;
- if (!strlen(config) || isspace(config[0]))
+ if (!strlen(config) || isspace(config[0])) {
+ err = 0;
goto noconfig;
+ }
kgdboc_io_ops.is_console = 0;
kgdb_tty_driver = NULL;