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Date: Mon, 1 Apr 2019 19:02:59 +0200 From: Greg Kroah-Hartman <gregkh@...uxfoundation.org> To: linux-kernel@...r.kernel.org Cc: Greg Kroah-Hartman <gregkh@...uxfoundation.org>, stable@...r.kernel.org, Wentao Wang <witallwang@...il.com>, Daniel Thompson <daniel.thompson@...aro.org> Subject: [PATCH 4.9 43/56] Disable kgdboc failed by echo space to /sys/module/kgdboc/parameters/kgdboc 4.9-stable review patch. If anyone has any objections, please let me know. ------------------ From: Wentao Wang <witallwang@...il.com> commit 3ec8002951ea173e24b466df1ea98c56b7920e63 upstream. 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@...il.com> Cc: stable <stable@...r.kernel.org> Acked-by: Daniel Thompson <daniel.thompson@...aro.org> Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org> --- drivers/tty/serial/kgdboc.c | 4 +++- 1 file changed, 3 insertions(+), 1 deletion(-) --- 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;
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