From: Randy Dunlap <rdunlap@xxxxxxxxxxxx>
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@xxxxxxxxxxxx>
Cc: Ian Abbott <abbotti@xxxxxxxxx>
Cc: Frank Mori Hess <fmhess@xxxxxxxxxxxxxxxxxxxxx>
---
drivers/staging/comedi/drivers.c | 5 +++++
1 file changed, 5 insertions(+)
--- linux-next-20120518.orig/drivers/staging/comedi/drivers.c
+++ linux-next-20120518/drivers/staging/comedi/drivers.c
@@ -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
}
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_unregister(comedi_driver);
}
EXPORT_SYMBOL_GPL(comedi_usb_driver_unregister);
+
+#endif
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