linux-kernel - [PATCH 4.14 29/55] kgdboc: Fix restrict error

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Message-Id: <20181206143003.301611791@linuxfoundation.org>
Date:   Thu,  6 Dec 2018 15:39:03 +0100
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     linux-kernel@...r.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        stable@...r.kernel.org, Laura Abbott <labbott@...hat.com>,
        Daniel Thompson <daniel.thompson@...aro.org>
Subject: [PATCH 4.14 29/55] kgdboc: Fix restrict error

4.14-stable review patch.  If anyone has any objections, please let me know.

------------------

From: Laura Abbott <labbott@...hat.com>

commit 2dd453168643d9475028cd867c57e65956a0f7f9 upstream.

There's an error when compiled with restrict:

drivers/tty/serial/kgdboc.c: In function ‘configure_kgdboc’:
drivers/tty/serial/kgdboc.c:137:2: error: ‘strcpy’ source argument is the same
as destination [-Werror=restrict]
  strcpy(config, opt);
  ^~~~~~~~~~~~~~~~~~~

As the error implies, this is from trying to use config as both source and
destination. Drop the call to the function where config is the argument
since nothing else happens in the function.

Signed-off-by: Laura Abbott <labbott@...hat.com>
Reviewed-by: Daniel Thompson <daniel.thompson@...aro.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>

---
 drivers/tty/serial/kgdboc.c |    6 ++----
 1 file changed, 2 insertions(+), 4 deletions(-)

--- a/drivers/tty/serial/kgdboc.c
+++ b/drivers/tty/serial/kgdboc.c
@@ -162,15 +162,13 @@ static int configure_kgdboc(void)
 {
 	struct tty_driver *p;
 	int tty_line = 0;
-	int err;
+	int err = -ENODEV;
 	char *cptr = config;
 	struct console *cons;
 
-	err = kgdboc_option_setup(config);
-	if (err || !strlen(config) || isspace(config[0]))
+	if (!strlen(config) || isspace(config[0]))
 		goto noconfig;
 
-	err = -ENODEV;
 	kgdboc_io_ops.is_console = 0;
 	kgdb_tty_driver = NULL;