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Disable kgdboc failed by echo space to /sys/module/kgdboc/parameters/kgdboc

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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: 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>
This commit is contained in:
Wentao Wang 2019-03-20 15:30:39 +00:00 • committed by Greg Kroah-Hartman
parent 6c1c9cfc2f
commit 98bc2f91e9
1 changed files with 3 additions and 1 deletions
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4
drivers/tty/serial/kgdboc.c
View file

@ -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;