On 12/2/20 6:26 PM, Ming Lei wrote:
> Hi,
>
> Qian reported there is hang during booting when shared host tagset is
> introduced on megaraid sas. Sumit reported the whole SCSI probe takes
> about ~45min in his test.
>
> Turns out it is caused by nr_hw_queues increased, especially commit
> b3c6a5997541("block: Fix a lockdep complaint triggered by request queue flushing")
> adds synchronize_rcu() for each hctx's release handler.
>
> Address the original lockdep false positive warning by simpler way, then
> long scsi probe can be avoided with lockdep enabled.
Applied, thanks.
--
Jens Axboe
