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75
* with -EINVAL. If there is more than one entry with the same address,
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* because it searches the list from end to beginning, it will unregister the
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* last one to be registered first (FILO- First In Last Out).
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* at the same time, because another driver could have unregistered a callback
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* between the submissions creating a gap earlier in the list, which would
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* be filled first at submission time.