block-5.9-2020-09-11

- Fix a regression in bdev partition locking (Christoph)

- NVMe pull request from Christoph:
	- cancel async events before freeing them (David Milburn)
	- revert a broken race fix (James Smart)
	- fix command processing during resets (Sagi Grimberg)

- Fix a kyber crash with requeued flushes (Omar)

- Fix __bio_try_merge_page() same_page error for no merging (Ritesh)
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