Driver core: implement uevent suppress in kobject

This patch implements uevent suppress in kobject and removes it
from struct device, based on the following ideas:

1,Uevent sending should be one attribute of kobject, so suppressing it
in kobject layer is more natural than in device layer. By this way,
we can do it for other objects embedded with kobject.

2,It may save several bytes for each instance of struct device.(On my
omap3(32bit ARM) based box, can save 8bytes per device object)

This patch also introduces dev_set|get_uevent_suppress() helpers to
set and query uevent_suppress attribute in case to help kobject
as private part of struct device in future.

[This version is against the latest driver-core patch set of Greg,please
ignore the last version.]

Signed-off-by: Ming Lei <tom.leiming@gmail.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>

1 files changed, 7 insertions, 0 deletions

diff --git a/lib/kobject_uevent.c b/lib/kobject_uevent.c
index 318328ddbd1c..b2181cc8e4d8 100644
--- a/lib/kobject_uevent.c
+++ b/lib/kobject_uevent.c
@@ -118,6 +118,13 @@ int kobject_uevent_env(struct kobject *kobj, enum kobject_action action,
         kset = top_kobj->kset;
         uevent_ops = kset->uevent_ops;
 
+        /* skip the event, if uevent_suppress is set*/
+        if (kobj->uevent_suppress) {
+                pr_debug("kobject: '%s' (%p): %s: uevent_suppress "
+                                 "caused the event to drop!\n",
+                                 kobject_name(kobj), kobj, __func__);
+                return 0;
+        }
         /* skip the event, if the filter returns zero. */
         if (uevent_ops && uevent_ops->filter)
                 if (!uevent_ops->filter(kset, kobj)) {