Submitted By: Alexander E. Patrakov
Date: 2004-06-02
Origin: Based on thoughts by Nathan Coulson and Kevin P. Fleming
Initial Package Version: 2.6.6
Upstream Status: The idea is being discussed in linux-hotplug-devel list
Description: It has been found that calling /sbin/hotplug by default
when a hotplug event arrives is unsafe, since userspace may be not ready
to handle the event. Various bugs appear because of that, e.g.;

http://bugs.linuxfromscratch.org/show_bug.cgi?id=842

This patch changes the default kernel behavior to doing nothing.
This can and must be overridden when the userspace is ready to handle hotplug
events, by the following command:

echo "/sbin/hotplug" >/proc/sys/kernel/hotplug

Before applying this patch, verify that you have this command in your
hotplug initscript!

--- linux-2.6.6.old/kernel/kmod.c	2004-05-13 10:52:58.000000000 +0600
+++ linux-2.6.6/kernel/kmod.c	2004-06-02 07:22:27.813676216 +0600
@@ -132,7 +132,7 @@
 	events.  the command is expected to load drivers when
 	necessary, and may perform additional system setup.
 */
-char hotplug_path[256] = "/sbin/hotplug";
+char hotplug_path[256] = "";
 
 EXPORT_SYMBOL(hotplug_path);