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kobject_uevent_env() drops the return value of call_usermodehelper().
It will make upper caller, such as dm_send_uevents(), to lose error
information.
BTW, Previously kobject_uevent_env() transmitted return of
call_usermodehelper() to callers, but
commit 5f123fbd80
"[PATCH] merge kobject_uevent and kobject_hotplug" removed it.
Signed-off-by: Wang Chen <wangchen@cn.fujitsu.com>
Cc: Kay Sievers <kay.sievers@suse.de>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>