drm/i915/pmu: Handle PCI unbind
Mark the device as closed and keep references to driver data alive to allow for safe driver unbind with active PMU clients. Perf core does not otherwise handle this case so we have to do it manually like this. Signed-off-by:Tvrtko Ursulin <tvrtko.ursulin@intel.com> Reviewed-by:
Chris Wilson <chris@chris-wilson.co.uk> Link: https://patchwork.freedesktop.org/patch/msgid/20201020100822.543332-1-tvrtko.ursulin@linux.intel.com
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