usb: host: xhci-plat: Do not define 'struct acpi_device_id' when !CONFIG_ACPI

Since ACPI_PTR() is used to NULLify the value when !CONFIG_ACPI,
struct usb_xhci_acpi_match becomes defined by unused.

Fixes the following W=1 kernel build warning(s):

 drivers/usb/host/xhci-plat.c:457:36: warning: ‘usb_xhci_acpi_match’ defined but not used [-Wunused-const-variable=]
 457 | static const struct acpi_device_id usb_xhci_acpi_match[] = {
 | ^~~~~~~~~~~~~~~~~~~

Cc: Mathias Nyman <mathias.nyman@intel.com>
Cc: Andrzej Siewior <bigeasy@linutronix.de>
Signed-off-by: Lee Jones <lee.jones@linaro.org>
Link: https://lore.kernel.org/r/20200706133341.476881-33-lee.jones@linaro.org
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

diff --git a/drivers/usb/host/xhci-plat.c b/drivers/usb/host/xhci-plat.c
index f6b4089bfc4a5122fdf9dc21e96966758d3cee2d..3e15b70a6fc99a6456ccac581ce9b9db9fc00ac8 100644 (file)
--- a/drivers/usb/host/xhci-plat.c
+++ b/drivers/usb/host/xhci-plat.c
@@ -454,12 +454,14 @@ static const struct dev_pm_ops xhci_plat_pm_ops = {
                           NULL)
 };
 
+#ifdef CONFIG_ACPI
 static const struct acpi_device_id usb_xhci_acpi_match[] = {
        /* XHCI-compliant USB Controller */
        { "PNP0D10", },
        { }
 };
 MODULE_DEVICE_TABLE(acpi, usb_xhci_acpi_match);
+#endif
 
 static struct platform_driver usb_xhci_driver = {
        .probe  = xhci_plat_probe,