linux-kernel - [PATCH -next v2] usb: add usb.h stubs for CONFIG

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Message-ID: <4FB7CACF.9030302@xenotime.net>
Date:	Sat, 19 May 2012 09:31:11 -0700
From:	Randy Dunlap <rdunlap@...otime.net>
To:	Greg Kroah-Hartman <gregkh@...uxfoundation.org>
CC:	Sergei Shtylyov <sshtylyov@...sta.com>, devel@...verdev.osuosl.org,
	Frank Mori Hess <fmhess@...rs.sourceforge.net>,
	Stephen Rothwell <sfr@...b.auug.org.au>,
	linux-usb@...r.kernel.org, LKML <linux-kernel@...r.kernel.org>,
	Ian Abbott <abbotti@....co.uk>, linux-next@...r.kernel.org
Subject: [PATCH -next v2] usb: add usb.h stubs for CONFIG_USB not enabled

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

Add stubs for some usb core functions when CONFIG_USB
is not enabled.  This fixes these comedi build errors:

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>
---
I am only adding the stubs that are needed for comedi to build.
I expect that more stubs will be needed as more build errors are
found.  It seems to me that linux/usb.h might need more (major)
moving of lines to support more stubs in the future.

 Documentation/usb/error-codes.txt |    2 ++
 include/linux/usb.h               |   25 ++++++++++++++++++++++++-
 2 files changed, 26 insertions(+), 1 deletion(-)

--- linux-next-20120518.orig/include/linux/usb.h
+++ linux-next-20120518/include/linux/usb.h
@@ -10,10 +10,11 @@
 
 #ifdef __KERNEL__
 
-#include <linux/errno.h>        /* for -ENODEV */
+#include <linux/errno.h>        /* for -ENODEV, -ENOSYS */
 #include <linux/delay.h>	/* for mdelay() */
 #include <linux/interrupt.h>	/* for in_interrupt() */
 #include <linux/list.h>		/* for struct list_head */
+#include <linux/kconfig.h>	/* for IS_ENABLED() */
 #include <linux/kref.h>		/* for struct kref */
 #include <linux/device.h>	/* for struct device */
 #include <linux/fs.h>		/* for struct file_operations */
@@ -515,6 +516,8 @@ static inline struct usb_device *interfa
 	return to_usb_device(intf->dev.parent);
 }
 
+#if IS_ENABLED(CONFIG_USB)
+
 extern struct usb_device *usb_get_dev(struct usb_device *dev);
 extern void usb_put_dev(struct usb_device *dev);
 
@@ -976,6 +979,26 @@ extern void usb_deregister_dev(struct us
 
 extern int usb_disabled(void);
 
+#else	/* stubs for USB not enabled */
+
+static inline int usb_register(struct usb_driver *driver)
+{
+	return -ENOSYS;
+}
+
+static inline int usb_register_driver(struct usb_driver *driver,
+				      struct module *mod,
+				      const char *modname)
+{
+	return -ENOSYS;
+}
+
+static inline void usb_deregister(struct usb_driver *driver)
+{
+}
+
+#endif
+
 /* ----------------------------------------------------------------------- */
 
 /*
--- linux-next-20120518.orig/Documentation/usb/error-codes.txt
+++ linux-next-20120518/Documentation/usb/error-codes.txt
@@ -167,6 +167,8 @@ processing, devices may receive such fau
 
 usb_register():
 -EINVAL			error during registering new driver
+-ENOSYS			CONFIG_USB is not enabled, so the function stub
+			returns an error.
 
 usb_get_*/usb_set_*():
 usb_control_msg():
--
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@...r.kernel.org
More majordomo info at  http://vger.kernel.org/majordomo-info.html
Please read the FAQ at  http://www.tux.org/lkml/