PM / sleep: Return -EBUSY from suspend_enter() on wakeup detection
PM / sleep: Return -EBUSY from suspend_enter() on wakeup detection

If a wakeup source is found to be pending in the last stage of
suspend after syscore suspend, then the machine won't suspend, but
suspend_enter() will return 0.  That is confusing, as wakeup detection
elsewhere causes -EBUSY to be returned from suspend_enter().

To avoid the confusion, make suspend_enter() return -EBUSY in that
case too.

Signed-off-by: Ruchi Kandoi <ff359ca7f9aedbb05cd6aa3d17e7b3b3ad3b25c9@google.com>
[ rjw: Subject and changelog ]
Signed-off-by: Rafael J. Wysocki <27ffc44a8ec6a212fba98cfc3246c6ce8ab131e0@intel.com>

KristFoundation/Programs,KristFoundation/Programs,KristFoundation/Programs,KristFoundation/Programs,KristFoundation/Programs,KristFoundation/Programs