From 74099b18b8db0670484e0caeb3425fb29ff3144e Mon Sep 17 00:00:00 2001 From: Kay Sievers Date: Mon, 5 Dec 2011 19:12:47 +0100 Subject: driver-core: skip uevent generation when nobody is listening Most network namespaces unlikely have listeners to uevents, and should benefit from skipping all the string copies. Cc: Eric Biederman Signed-off-by: Kay Sievers Signed-off-by: Greg Kroah-Hartman --- lib/kobject_uevent.c | 3 +++ 1 file changed, 3 insertions(+) diff --git a/lib/kobject_uevent.c b/lib/kobject_uevent.c index ad72a03ce5e..e66e9b63261 100644 --- a/lib/kobject_uevent.c +++ b/lib/kobject_uevent.c @@ -259,6 +259,9 @@ int kobject_uevent_env(struct kobject *kobj, enum kobject_action action, struct sk_buff *skb; size_t len; + if (!netlink_has_listeners(uevent_sock, 1)) + continue; + /* allocate message with the maximum possible size */ len = strlen(action_string) + strlen(devpath) + 2; skb = alloc_skb(len + env->buflen, GFP_KERNEL); -- cgit v1.2.3