USB: xhci: Fix compile error when CONFIG_PM=n

Fix this error when CONFIG_PM is not enabled:

drivers/usb/host/xhci.c:675: error: implicit declaration of function 'usb_root_hub_lost_power'

Wrap xhci_suspend() and xhci_resume() into an ifdef CONFIG_PM, along with
the functions that only they call -- xhci_save_registers() and
xhci_restore_registers().

Reported-by: Randy Dunlap <randy.dunlap@oracle.com>
Signed-off-by: Sarah Sharp <sarah.a.sharp@linux.intel.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>

diff --git a/drivers/usb/host/xhci.c b/drivers/usb/host/xhci.c
index 33d0034d8a6f947d8e7f7a2cc004b8a6c4fa85a6..9dc5be557d92795281cf60018ba2ecf375f3750b 100644 (file)
--- a/drivers/usb/host/xhci.c
+++ b/drivers/usb/host/xhci.c
@@ -551,6 +551,7 @@ void xhci_shutdown(struct usb_hcd *hcd)
                    xhci_readl(xhci, &xhci->op_regs->status));
 }
 
+#ifdef CONFIG_PM
 static void xhci_save_registers(struct xhci_hcd *xhci)
 {
        xhci->s3.command = xhci_readl(xhci, &xhci->op_regs->command);
@@ -761,6 +762,13 @@ int xhci_resume(struct xhci_hcd *xhci, bool hibernated)
        return 0;
 }
 
+#else
+
+#define        xhci_suspend    NULL
+#define        xhci_resume     NULL
+
+#endif /* CONFIG_PM */
+
 /*-------------------------------------------------------------------------*/
 
 /**