usb/xhci: remove CONFIG_PCI in xhci.c's probe function

This removes the need of ifdefs within the init function and with it the
headache about the correct clean without bus X but with bus/platform Y &
Z.
xhci-pci is only compiled if CONFIG_PCI is selected which can be
de-selected now without trouble. For now the result is kinda useless
because we have no other glue code. However, since nobody is using
USB_ARCH_HAS_XHCI then it should not be an issue :)
Signed-off-by: Sebastian Andrzej Siewior <bigeasy@linutronix.de>
Signed-off-by: Sarah Sharp <sarah.a.sharp@linux.intel.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>

drivers/usb/host/Makefile

@@ -11,8 +11,9 @@ fhci-y += fhci-mem.o fhci-tds.o fhci-sched.o
 
 fhci-$(CONFIG_FHCI_DEBUG) += fhci-dbg.o
 
-xhci-hcd-y := xhci.o xhci-mem.o xhci-pci.o
+xhci-hcd-y := xhci.o xhci-mem.o
 xhci-hcd-y += xhci-ring.o xhci-hub.o xhci-dbg.o
+xhci-hcd-$(CONFIG_PCI)	+= xhci-pci.o
 
 obj-$(CONFIG_USB_WHCI_HCD)	+= whci/
 

drivers/usb/host/xhci-pci.c

@@ -320,12 +320,12 @@ static struct pci_driver xhci_pci_driver = {
 #endif
 };
 
-int xhci_register_pci(void)
+int __init xhci_register_pci(void)
 {
 	return pci_register_driver(&xhci_pci_driver);
 }
 
-void xhci_unregister_pci(void)
+void __exit xhci_unregister_pci(void)
 {
 	pci_unregister_driver(&xhci_pci_driver);
 }

drivers/usb/host/xhci.c

@@ -4039,16 +4039,13 @@ MODULE_LICENSE("GPL");
 
 static int __init xhci_hcd_init(void)
 {
-#ifdef CONFIG_PCI
-	int retval = 0;
+	int retval;
 
 	retval = xhci_register_pci();
-
 	if (retval < 0) {
 		printk(KERN_DEBUG "Problem registering PCI driver.");
 		return retval;
 	}
-#endif
 	/*
 	 * Check the compiler generated sizes of structures that must be laid
 	 * out in specific ways for hardware access.
@@ -4073,8 +4070,6 @@ module_init(xhci_hcd_init);
 
 static void __exit xhci_hcd_cleanup(void)
 {
-#ifdef CONFIG_PCI
 	xhci_unregister_pci();
-#endif
 }
 module_exit(xhci_hcd_cleanup);

drivers/usb/host/xhci.h

@@ -1644,6 +1644,9 @@ void xhci_free_command(struct xhci_hcd *xhci,
 /* xHCI PCI glue */
 int xhci_register_pci(void);
 void xhci_unregister_pci(void);
+#else
+static inline int xhci_register_pci(void) { return 0; }
+static inline void xhci_unregister_pci(void) {}
 #endif
 
 /* xHCI host controller glue */