linux-kernel - Re: [PATCH] scsi: sd: add runtime pm to open / release

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Message-ID: <f17e9ebe-fc75-fb51-cc9b-851fa219f31b@acm.org>
Date:   Tue, 30 Jun 2020 16:31:58 -0700
From:   Bart Van Assche <bvanassche@....org>
To:     Alan Stern <stern@...land.harvard.edu>
Cc:     Martin Kepplinger <martin.kepplinger@...i.sm>, jejb@...ux.ibm.com,
        Can Guo <cang@...eaurora.org>, martin.petersen@...cle.com,
        linux-scsi@...r.kernel.org, linux-kernel@...r.kernel.org,
        kernel@...i.sm
Subject: Re: [PATCH] scsi: sd: add runtime pm to open / release

On 2020-06-30 12:38, Alan Stern wrote:
> Assume that BLK_MQ_REQ_PREEMPT is set in flags.  Then where exactly 
> does blk_queue_enter(q, flags) call blk_pm_request_resume(q)?

Please take a look at how the *current* implementation of runtime power
management works. Your question is relevant for the old implementation
of runtime power management but not for the current implementation.

Bart.