Modules: Allow sysfs module paramaters to be written to.

Fixes a bug in the current tree preventing the sysfs module paramaters from being able
to be changed at all from userspace.  It's as if someone just forgot to write this function...

Signed-off-by: Greg Kroah-Hartman <greg@kroah.com>

diff -Nru a/kernel/params.c b/kernel/params.c
--- a/kernel/params.c	2005-01-24 21:07:40 -08:00
+++ b/kernel/params.c	2005-01-24 21:07:40 -08:00
@@ -640,9 +640,33 @@
 	return ret;
 }
 
+static ssize_t module_attr_store(struct kobject *kobj,
+				struct attribute *attr,
+				const char *buf, size_t len)
+{
+	struct module_attribute *attribute;
+	struct module_kobject *mk;
+	int ret;
+
+	attribute = to_module_attr(attr);
+	mk = to_module_kobject(kobj);
+
+	if (!attribute->store)
+		return -EPERM;
+
+	if (!try_module_get(mk->mod))
+		return -ENODEV;
+
+	ret = attribute->store(attribute, mk->mod, buf, len);
+
+	module_put(mk->mod);
+
+	return ret;
+}
+
 static struct sysfs_ops module_sysfs_ops = {
 	.show = module_attr_show,
-	.store = NULL,
+	.store = module_attr_store,
 };
 
 #else