[linux-usb-devel] [patch] add "nousb" to kernel

[Randy.Dunlap]

Greg,

Here's "nousb" for 2.4.39 if you want it.
It only applies to USB when built into a kernel image,
not as modules.
[Could be changed, but I didn't see a need for it.]

I'm working on some Documentation/kernel-parameters.txt
changes also, so I'll add this one when it's accepted.

~Randy
--- ./drivers/usb/core/usb.c.2539       Fri Sep 27 14:49:55 2002
+++ ./drivers/usb/core/usb.c    Fri Sep 27 22:35:30 2002
@@ -1440,11 +1440,32 @@
        .hotplug =      usb_hotplug,
 };
 
+int nousb;             /* Disable USB when built into kernel image */
+                       /* Not honored on modular build */
+
+#ifndef MODULE
+
+static int __init usb_setup_disable(char *str)
+{
+       nousb = 1;
+       return 1;
+}
+
+/* format to disable USB on kernel command line is: nousb */
+__setup("nousb", usb_setup_disable);
+
+#endif
+
 /*
  * Init
  */
 static int __init usb_init(void)
 {
+       if (nousb) {
+               info("USB support disabled\n");
+               return 0;
+       }
+
        bus_register(&usb_bus_type);
        usb_major_init();
        usbfs_init();
@@ -1460,6 +1481,10 @@
  */
 static void __exit usb_exit(void)
 {
+       /* This will matter if shutdown/reboot does exitcalls. */
+       if (nousb)
+               return;
+
        remove_driver(&usb_generic_driver);
        usb_major_cleanup();
        usbfs_cleanup();