Re: [PATCH V2] scsi: avoid to run synchronize_rcu for each device in scsi_host_block

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To: Ming Lei <ming.lei@xxxxxxxxxx>
Subject: Re: [PATCH V2] scsi: avoid to run synchronize_rcu for each device in scsi_host_block
From: "Martin K. Petersen" <martin.petersen@xxxxxxxxxx>
Date: Fri, 24 Apr 2020 14:12:27 -0400
Cc: James Bottomley <James.Bottomley@xxxxxxxxxxxxxxxxxxxxx>, linux-scsi@xxxxxxxxxxxxxxx, "Martin K . Petersen" <martin.petersen@xxxxxxxxxx>, Steffen Maier <maier@xxxxxxxxxxxxx>, Bart Van Assche <bvanassche@xxxxxxx>, Christoph Hellwig <hch@xxxxxx>, Dexuan Cui <decui@xxxxxxxxxxxxx>, Hannes Reinecke <hare@xxxxxxx>
In-reply-to: <20200423020713.332743-1-ming.lei@redhat.com> (Ming Lei's message of "Thu, 23 Apr 2020 10:07:13 +0800")
Organization: Oracle Corporation
User-agent: Gnus/5.13 (Gnus v5.13) Emacs/26.1.92 (gnu/linux)

Ming,

> scsi_host_block() calls scsi_internal_device_block() for each
> scsi_device, and scsi_internal_device_block() calls
> blk_mq_quiesce_queue() for each LUN. However synchronize_rcu is
> run from blk_mq_quiesce_queue().

Applied to 5.8/scsi-queue, thank you!

-- 
Martin K. Petersen	Oracle Linux Engineering

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References:
- [PATCH V2] scsi: avoid to run synchronize_rcu for each device in scsi_host_block
  - From: Ming Lei

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