serial: core: Make uart_parse_options take const char* argument

The pointed string is never modified from within uart_parse_options, so
it should be marked as const in the function prototype.

Signed-off-by: Paul Cercueil <paul@crapouillou.net>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

2 files changed, 4 insertions, 3 deletions

diff --git a/drivers/tty/serial/serial_core.c b/drivers/tty/serial/serial_core.c
index f57969de2f1c..2148883db66d 100644
--- a/drivers/tty/serial/serial_core.c
+++ b/drivers/tty/serial/serial_core.c
@@ -1955,9 +1955,10 @@ EXPORT_SYMBOL_GPL(uart_parse_earlycon);
  *      eg: 115200n8r
  */
 void
-uart_parse_options(char *options, int *baud, int *parity, int *bits, int *flow)
+uart_parse_options(const char *options, int *baud, int *parity,
+                   int *bits, int *flow)
 {
-        char *s = options;
+        const char *s = options;
 
         *baud = simple_strtoul(s, NULL, 10);
         while (*s >= '0' && *s <= '9')
diff --git a/include/linux/serial_core.h b/include/linux/serial_core.h
index b60b225c0a59..4c310c34ddad 100644
--- a/include/linux/serial_core.h
+++ b/include/linux/serial_core.h
@@ -387,7 +387,7 @@ struct uart_port *uart_get_console(struct uart_port *ports, int nr,
                                    struct console *c);
 int uart_parse_earlycon(char *p, unsigned char *iotype, resource_size_t *addr,
                         char **options);
-void uart_parse_options(char *options, int *baud, int *parity, int *bits,
+void uart_parse_options(const char *options, int *baud, int *parity, int *bits,
                         int *flow);
 int uart_set_options(struct uart_port *port, struct console *co, int baud,
                      int parity, int bits, int flow);