serial: 8250_dw: Use ifdef with ACPI

There are no stubs for ACPI functions so the driver needs to
have this ifdef or it will not compile without ACPI.

Signed-off-by: Heikki Krogerus <heikki.krogerus@linux.intel.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

1 files changed, 7 insertions, 0 deletions

diff --git a/drivers/tty/serial/8250/8250_dw.c b/drivers/tty/serial/8250/8250_dw.c
index ceacf5e36f2e..bfdaf8b2680b 100644
--- a/drivers/tty/serial/8250/8250_dw.c
+++ b/drivers/tty/serial/8250/8250_dw.c
@@ -145,6 +145,7 @@ static int dw8250_probe_of(struct uart_port *p)
         return 0;
 }
 
+#ifdef CONFIG_ACPI
 static bool dw8250_acpi_dma_filter(struct dma_chan *chan, void *parm)
 {
         return chan->chan_id == *(int *)parm;
@@ -231,6 +232,12 @@ static int dw8250_probe_acpi(struct uart_port *p)
 
         return 0;
 }
+#else
+static inline int dw8250_probe_acpi(struct uart_port *p)
+{
+        return -ENODEV;
+}
+#endif /* CONFIG_ACPI */
 
 static void dw8250_setup_port(struct uart_8250_port *up)
 {