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Commit 0209f339 authored by Wentao Wang's avatar Wentao Wang Committed by Greg Kroah-Hartman
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Disable kgdboc failed by echo space to /sys/module/kgdboc/parameters/kgdboc 



commit 3ec8002951ea173e24b466df1ea98c56b7920e63 upstream.

Echo "" to /sys/module/kgdboc/parameters/kgdboc will fail with "No such
device” 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: default avatarWentao Wang <witallwang@gmail.com>
Cc: stable <stable@vger.kernel.org>
Acked-by: default avatarDaniel Thompson <daniel.thompson@linaro.org>
Signed-off-by: default avatarGreg Kroah-Hartman <gregkh@linuxfoundation.org>
parent 29c87d22

drivers/tty/serial/kgdboc.c

+3 −1
Original line number Diff line number Diff line
@@ -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;