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As we can have multiple tx in the queue, with individual waiters, make sure that all are woken when any state changes (so that we are sure the right owner of the txmsg is woken). Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk> Signed-off-by: Daniel Vetter <daniel.vetter@ffwll.ch> Link: http://patchwork.freedesktop.org/patch/msgid/20170513105201.17658-2-chris@chris-wilson.co.uk