serial: core: Fix handling of options after MMIO address

Guenter Roeck reported a regression caused by commit "serial: earlycon:
Extend earlycon command line option to support 64-bit addresses":

console= and earlycon= options have the following format:
...,<addr>,<options>

Historically used here simple_strtoul() had no problems with comma, but the
new and recommended kstrtoull() requires null-terminated string and returns
-EINVAL in case there are "options" at the end. There is no recommended to
use function currently that will support it, so stick to obsolete
simple_strtoull() variant.

Signed-off-by: Alexander Sverdlin <[email protected]>
Reported-by: Guenter Roeck <[email protected]>
Reviewed-by: Guenter Roeck <[email protected]>
Tested-by: Guenter Roeck <[email protected]>
Signed-off-by: Greg Kroah-Hartman <[email protected]>

drivers/tty/serial/serial_core.c

@@ -1892,14 +1892,11 @@ uart_get_console(struct uart_port *ports, int nr, struct console *co)
  *	   console=<name>,0x<addr>,<options>
  *	is also accepted; the returned @iotype will be UPIO_MEM.
  *
- *	Returns 0 on success, -EINVAL or -ERANGE on failure
+ *	Returns 0 on success or -EINVAL on failure
  */
 int uart_parse_earlycon(char *p, unsigned char *iotype, resource_size_t *addr,
 			char **options)
 {
-	int ret;
-	unsigned long long tmp;
-
 	if (strncmp(p, "mmio,", 5) == 0) {
 		*iotype = UPIO_MEM;
 		p += 5;
@@ -1925,10 +1922,11 @@ int uart_parse_earlycon(char *p, unsigned char *iotype, resource_size_t *addr,
 		return -EINVAL;
 	}
 
-	ret = kstrtoull(p, 0, &tmp);
-	if (ret)
-		return ret;
-	*addr = tmp;
+	/*
+	 * Before you replace it with kstrtoull(), think about options separator
+	 * (',') it will not tolerate
+	 */
+	*addr = simple_strtoull(p, NULL, 0);
 	p = strchr(p, ',');
 	if (p)
 		p++;