disk/aio: Cancel AIO thread on cleanup
If the AIO thread is still calling io_getevents() while the exit path calls io_destroy(), it will segfault. Wait for the thread to finish before destroying the context. Reviewed-by:Andre Przywara <andre.przywara@arm.com> Signed-off-by:
Jean-Philippe Brucker <jean-philippe.brucker@arm.com> Signed-off-by:
Will Deacon <will.deacon@arm.com>
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