[PATCH, v3] fix build with XEN and EARLY_PRINTK_DBGP enabled but USB_SUPPORT disabled

["Jan Beulich" <JBeulich@xxxxxxxx>]

Since there's no possible caller of dbgp_external_startup() and
dbgp_reset_prep() when !USB, there's no point in building and exporting
these functions in that case. This eliminates a build error under the
conditions listed in the subject, introduced with the merge
f1c6872e4980bc4078cfaead05f892b3d78dea64.

Reported-by: Randy Dunlap <rdunlap@xxxxxxxxxxxx>
Signed-off-by: Jan Beulich <jbeulich@xxxxxxxx>
Cc: Alan Stern <stern@xxxxxxxxxxxxxxxxxxx>
Cc: Stefano Stabellini <stefano.stabellini@xxxxxxxxxxxxx>
---
(incremental patch attached, in case that one is preferred)

v3: Relax condition from USB_EHCI_HCD to just USB, to also cover the
    chipidea driver re-using code from ehci-hcd.
v2: Switch the dependency from USB_SUPPORT to USB_EHCI_HCD as requested
    by Alan (albeit I don't really agree to that change).

---
 drivers/usb/early/ehci-dbgp.c       |   15 +++++++++------
 1 file changed, 9 insertions(+), 6 deletions(-)

--- 3.7-rc3/drivers/usb/early/ehci-dbgp.c
+++ 3.7-rc3-ehci-dbgp-early-xen-no-usb/drivers/usb/early/ehci-dbgp.c
@@ -20,6 +20,7 @@
 #include <linux/usb/ehci_def.h>
 #include <linux/delay.h>
 #include <linux/serial_core.h>
+#include <linux/kconfig.h>
 #include <linux/kgdb.h>
 #include <linux/kthread.h>
 #include <asm/io.h>
@@ -614,12 +615,6 @@ err:
 	return -ENODEV;
 }
 
-int dbgp_external_startup(struct usb_hcd *hcd)
-{
-	return xen_dbgp_external_startup(hcd) ?: _dbgp_external_startup();
-}
-EXPORT_SYMBOL_GPL(dbgp_external_startup);
-
 static int ehci_reset_port(int port)
 {
 	u32 portsc;
@@ -979,6 +974,7 @@ struct console early_dbgp_console = {
 	.index =	-1,
 };
 
+#if IS_ENABLED(CONFIG_USB)
 int dbgp_reset_prep(struct usb_hcd *hcd)
 {
 	int ret = xen_dbgp_reset_prep(hcd);
@@ -1007,6 +1003,13 @@ int dbgp_reset_prep(struct usb_hcd *hcd)
 }
 EXPORT_SYMBOL_GPL(dbgp_reset_prep);
 
+int dbgp_external_startup(struct usb_hcd *hcd)
+{
+	return xen_dbgp_external_startup(hcd) ?: _dbgp_external_startup();
+}
+EXPORT_SYMBOL_GPL(dbgp_external_startup);
+#endif /* USB */
+
 #ifdef CONFIG_KGDB
 
 static char kgdbdbgp_buf[DBGP_MAX_PACKET];



fix build of EHCI debug port code when USB_CHIPIDEA but not USB_EHCI_HCD

Relax condition of building the reset interface stubs in
drivers/usb/early/ehci-dbgp.c from USB_EHCI_HCD to just USB, to also
cover the chipidea driver re-using code from ehci-hcd.

Reported-by: Randy Dunlap <rdunlap@xxxxxxxxxxxx>
Signed-off-by: Jan Beulich <jbeulich@xxxxxxxx>
Cc: Alan Stern <stern@xxxxxxxxxxxxxxxxxxx>
Cc: Stefano Stabellini <stefano.stabellini@xxxxxxxxxxxxx>

---
 drivers/usb/early/ehci-dbgp.c       |   4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

--- 3.7-rc3.orig/drivers/usb/early/ehci-dbgp.c
+++ 3.7-rc3/drivers/usb/early/ehci-dbgp.c
@@ -974,7 +974,7 @@ struct console early_dbgp_console = {
 	.index =	-1,
 };
 
-#if IS_ENABLED(CONFIG_USB_EHCI_HCD)
+#if IS_ENABLED(CONFIG_USB)
 int dbgp_reset_prep(struct usb_hcd *hcd)
 {
 	int ret = xen_dbgp_reset_prep(hcd);
@@ -1008,7 +1008,7 @@ int dbgp_external_startup(struct usb_hcd
 	return xen_dbgp_external_startup(hcd) ?: _dbgp_external_startup();
 }
 EXPORT_SYMBOL_GPL(dbgp_external_startup);
-#endif /* USB_EHCI_HCD */
+#endif /* USB */
 
 #ifdef CONFIG_KGDB