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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 <ebiederm@xmission.com>
Signed-off-by: Kay Sievers <kay.sievers@vrfy.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
hifive-unleashed-5.1
Kay Sievers 2011-12-05 19:12:47 +01:00 committed by Greg Kroah-Hartman
parent cf6a2eacbc
commit 74099b18b8
1 changed files with 3 additions and 0 deletions
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3
lib/kobject_uevent.c
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@ -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);