From 66d39c0de0abd45ddca7aa8fc08632b01d669d7b Mon Sep 17 00:00:00 2001
From: Wentao Wang <“witallw...@gmail.com”>
Date: Mon, 4 Mar 2019 21:58:33 +0800
Subject: [PATCH] Disable kgdboc failed by echo space to
/sys/module/kgdboc/parameters/kgdboc
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Echo "" to /sys/module/kgdboc/parameters/kgdboc will fail with write
error: No such device
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: 2dd453168643d ("kgdboc: Fix restrict error")
Signed-off-by: Wentao Wang <“witallw...@gmail.com”>
---
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 6fb312e..bfe5e9e 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;
--
2.7.4
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