Re: [PATCH -next] usb: add usb.h stubs for CONFIG_USB not enabled

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On 19-05-2012 6:04, Randy Dunlap wrote:

From: Randy Dunlap<rdunlap@xxxxxxxxxxxx>

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@xxxxxxxxxxxx>
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               |   24 +++++++++++++++++++++++-
  2 files changed, 25 insertions(+), 1 deletion(-)

--- linux-next-20120518.orig/include/linux/usb.h
+++ linux-next-20120518/include/linux/usb.h
@@ -10,7 +10,7 @@

  #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 */
@@ -515,6 +515,8 @@ static inline struct usb_device *interfa
  	return to_usb_device(intf->dev.parent);

+#if defined(CONFIG_USB) || defined(CONFIG_USB_MODULE)

   You can use IS_ENABLED(CONFIG_USB) instead of these two now.

WBR, Sergei
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