rwsem: avoid taking wait_lock in rwsem_down_write_failed
In rwsem_down_write_failed(), if there are active locks after we wake up (i.e. the lock got stolen from us), skip taking the wait_lock and go back to sleep immediately. Signed-off-by: NMichel Lespinasse <walken@google.com> Reviewed-by: NPeter Hurley <peter@hurleysoftware.com> Acked-by: NDavidlohr Bueso <davidlohr.bueso@hp.com> Acked-by: NRik van Riel <riel@redhat.com> Signed-off-by: NLinus Torvalds <torvalds@linux-foundation.org>
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