Commit 74099b18 authored by Kay Sievers's avatar Kay Sievers Committed by Greg Kroah-Hartman

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: default avatarKay Sievers <>
Signed-off-by: default avatarGreg Kroah-Hartman <>
parent cf6a2eac
......@@ -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))
/* allocate message with the maximum possible size */
len = strlen(action_string) + strlen(devpath) + 2;
skb = alloc_skb(len + env->buflen, GFP_KERNEL);
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