linux-kernel - Re: SCSI low level driver: how to prevent I/O upon hibernation?

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Message-ID: <55ba8004-55fa-4bd6-59e9-c21f9c0e75bc@acm.org>
Date:   Sat, 11 Apr 2020 08:03:11 -0700
From:   Bart Van Assche <bvanassche@....org>
To:     Dexuan Cui <decui@...rosoft.com>, Ming Lei <tom.leiming@...il.com>,
        "Martin K. Petersen" <martin.petersen@...cle.com>
Cc:     "linux-scsi@...r.kernel.org" <linux-scsi@...r.kernel.org>,
        Christoph Hellwig <hch@....de>,
        "linux-hyperv@...r.kernel.org" <linux-hyperv@...r.kernel.org>,
        Long Li <longli@...rosoft.com>, vkuznets <vkuznets@...hat.com>,
        Michael Kelley <mikelley@...rosoft.com>,
        KY Srinivasan <kys@...rosoft.com>,
        Olaf Hering <olaf@...fle.de>,
        Stephen Hemminger <sthemmin@...rosoft.com>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: Re: SCSI low level driver: how to prevent I/O upon hibernation?

On 2020-04-10 23:01, Dexuan Cui wrote:
> Please let me know if the change to scsi_device_set_state() is OK.

Hadn't Ming Lei already root-caused this issue for you? From his e-mail:
"So you can't free related vmbus ringbuffer cause BLK_MQ_REQ_PREEMPT
request is still to be handled."

Please follow that advice.

Thanks,

Bart.