[PATCH] Modules: Allow sysfs module parameters to be written to.

This fixes a bug in the current tree preventing the sysfs module
parameters 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>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>

1 files changed, 25 insertions, 1 deletions

diff --git a/kernel/params.c b/kernel/params.c
index ec3dbf68e253..5538608bd339 100644
--- a/kernel/params.c
+++ b/kernel/params.c
@@ -640,9 +640,33 @@ static ssize_t module_attr_show(struct kobject *kobj,
 	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