USB: disable USB_MULTITHREAD_PROBE

Disable the USB_MULTITHREAD_PROBE option because it causes crashes on
people's machines and they never remember to actually read the config
help files.

No one likes this, everyone hates it, I'm going to go eat worms...

The full logic will be ripped out later.

Signed-off-by: Greg Kroah-Hartman <[e-mail]>

drivers/usb/core/Kconfig

···
 
 	  If you are unsure about this, say N here.
 
-config USB_MULTITHREAD_PROBE
-	bool "USB Multi-threaded probe (EXPERIMENTAL)"
-	depends on USB && EXPERIMENTAL
-	default n
-	help
-	  Say Y here if you want the USB core to spawn a new thread for
-	  every USB device that is probed.  This can cause a small speedup
-	  in boot times on systems with a lot of different USB devices.
-
-	  This option should be safe to enable, but if any odd probing
-	  problems are found, please disable it, or dynamically turn it
-	  off in the /sys/module/usbcore/parameters/multithread_probe
-	  file
-
-	  When in doubt, say N.
-
 config USB_OTG
 	bool
 	depends on USB && EXPERIMENTAL

drivers/usb/core/hub.c

···
 static struct task_struct *khubd_task;
 
 /* multithreaded probe logic */
-static int multithread_probe =
-#ifdef CONFIG_USB_MULTITHREAD_PROBE
-	1;
-#else
-	0;
-#endif
-module_param(multithread_probe, bool, S_IRUGO);
-MODULE_PARM_DESC(multithread_probe, "Run each USB device probe in a new thread");
+static int multithread_probe = 0;
 
 /* cycle leds on hubs that aren't blinking for attention */
 static int blinkenlights = 0;