[PATCH 1/1] kobject: Don't emit change events if not in sysfs

[Abhishek Pandit-Subedi]

Add a check to make sure the kobj is created and in sysfs before sending
a change event notification. Otherwise, udev rules that depend on the
change notification may find that the path that changed doesn't actually
exist.

Fixes: a45aca510b73b7 (PM: sleep: core: Emit changed uevent on 
wakeup_sysfs_add/remove)
Signed-off-by: Abhishek Pandit-Subedi <abhishekpan...@chromium.org>
---

 lib/kobject_uevent.c | 5 +++++
 1 file changed, 5 insertions(+)

diff --git a/lib/kobject_uevent.c b/lib/kobject_uevent.c
index 7998affa45d49a..f08197e907d5ce 100644
--- a/lib/kobject_uevent.c
+++ b/lib/kobject_uevent.c
@@ -473,6 +473,11 @@ int kobject_uevent_env(struct kobject *kobj, enum 
kobject_action action,
        if (action == KOBJ_REMOVE)
                kobj->state_remove_uevent_sent = 1;
 
+       if (action == KOBJ_CHANGE && !kobj->state_in_sysfs) {
+               pr_debug("kobject: can't emit KOBJ_CHANGE until in sysfs\n");
+               return -EINVAL;
+       }
+
        pr_debug("kobject: '%s' (%p): %s\n",
                 kobject_name(kobj), kobj, __func__);
 
-- 
2.29.0.rc1.297.gfa9743e501-goog