linux-kernel - [PATCH -next] comedi: fix build when USB is not enabled

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Message-ID: <4FB6ED55.6090805@xenotime.net>
Date:	Fri, 18 May 2012 17:46:13 -0700
From:	Randy Dunlap <rdunlap@...otime.net>
To:	Stephen Rothwell <sfr@...b.auug.org.au>
CC:	linux-next@...r.kernel.org, LKML <linux-kernel@...r.kernel.org>,
	Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
	Ian Abbott <abbotti@....co.uk>,
	Frank Mori Hess <fmhess@...rs.sourceforge.net>,
	devel@...verdev.osuosl.org
Subject: [PATCH -next] comedi: fix build when USB is not enabled

From: Randy Dunlap <rdunlap@...otime.net>

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@...otime.net>
Cc:	Ian Abbott <abbotti@....co.uk>
Cc:	Frank Mori Hess <fmhess@...rs.sourceforge.net>
---
 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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