staging/comedi: fix build for USB not enabled
authorRandy Dunlap <rdunlap@xenotime.net>
Mon, 11 Jun 2012 23:35:50 +0000 (16:35 -0700)
committerGreg Kroah-Hartman <gregkh@linuxfoundation.org>
Mon, 11 Jun 2012 23:49:35 +0000 (16:49 -0700)
Calls to optional subsystems cannot be made indiscriminately.
Enclose all of the usb helper functions inside
#if IS_ENABLED(CONFIG_USB)
to fix these build errors.

(The pci helper functions are OK since there are stubs in
linux/pci.h for the called functions when PCI is not enabled.
Possibly the same could be done for the called USB functions.)

ERROR: "usb_deregister" [drivers/staging/comedi/comedi.ko] undefined!
ERROR: "usb_register_driver" [drivers/staging/comedi/comedi.ko] undefined!

Signed-off-by: Randy Dunlap <rdunlap@xenotime.net>
Cc: Ian Abbott <abbotti@mev.co.uk>
Cc: Frank Mori Hess <fmhess@users.sourceforge.net>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
drivers/staging/comedi/drivers.c

index 1c3d638..aeac1ca 100644 (file)
@@ -30,6 +30,7 @@
 #include <linux/pci.h>
 #include <linux/usb.h>
 #include <linux/errno.h>
+#include <linux/kconfig.h>
 #include <linux/kernel.h>
 #include <linux/sched.h>
 #include <linux/fcntl.h>
@@ -981,6 +982,8 @@ void comedi_pci_driver_unregister(struct comedi_driver *comedi_driver,
 }
 EXPORT_SYMBOL_GPL(comedi_pci_driver_unregister);
 
+#if IS_ENABLED(CONFIG_USB)
+
 static int comedi_old_usb_auto_config(struct usb_interface *intf,
                                      struct comedi_driver *driver)
 {
@@ -1043,3 +1046,5 @@ void comedi_usb_driver_unregister(struct comedi_driver *comedi_driver,
        comedi_driver_unregister(comedi_driver);
 }
 EXPORT_SYMBOL_GPL(comedi_usb_driver_unregister);
+
+#endif