drm/i915: Double check that the wait_request is not pending before warning
If we are busy, then we may have woken up the wait_request handler but not yet serviced it before the hang check fires. So in hang check, double check that the i915_gem_do_wait_request() is still pending the wake-up before declaring all hope lost. Fixes regression with e78d73b1. Bugzilla: https://bugs.freedesktop.org/show_bug.cgi?id=30073Reported-and-tested-by: NSitsofe Wheeler <sitsofe@yahoo.com> Signed-off-by: NChris Wilson <chris@chris-wilson.co.uk>
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