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Message-ID: <20200418024158.GB17090@T590>
Date: Sat, 18 Apr 2020 10:41:58 +0800
From: Ming Lei <ming.lei@...hat.com>
To: Dexuan Cui <decui@...rosoft.com>
Cc: jejb@...ux.ibm.com, martin.petersen@...cle.com,
linux-scsi@...r.kernel.org, linux-kernel@...r.kernel.org,
hch@....de, bvanassche@....org, hare@...e.de,
mikelley@...rosoft.com, longli@...rosoft.com
Subject: Re: [PATCH] scsi: core: Allow the state change from SDEV_QUIESCE to
SDEV_BLOCK
On Fri, Apr 17, 2020 at 05:40:45PM -0700, Dexuan Cui wrote:
> The APIs scsi_host_block()/scsi_host_unblock() are recently added by:
> 2bb955840c1d ("scsi: core: add scsi_host_(block,unblock) helper function")
> and so far the APIs are only used by:
> 3d3ca53b1639 ("scsi: aacraid: use scsi_host_(block,unblock) to block I/O")
>
> However, from reading the code, I think the APIs don't really work for
> aacraid, because, in the resume path of hibernation, when aac_suspend() ->
> scsi_host_block() is called, scsi_device_quiesce() has set the state to
> SDEV_QUIESCE, so aac_suspend() -> scsi_host_block() returns -EINVAL.
>
> Fix the issue by allowing the state change.
>
> Fixes: 2bb955840c1d ("scsi: core: add scsi_host_(block,unblock) helper function")
> Signed-off-by: Dexuan Cui <decui@...rosoft.com>
> ---
> drivers/scsi/scsi_lib.c | 1 +
> 1 file changed, 1 insertion(+)
>
> diff --git a/drivers/scsi/scsi_lib.c b/drivers/scsi/scsi_lib.c
> index 47835c4b4ee0..06c260f6cdae 100644
> --- a/drivers/scsi/scsi_lib.c
> +++ b/drivers/scsi/scsi_lib.c
> @@ -2284,6 +2284,7 @@ scsi_device_set_state(struct scsi_device *sdev, enum scsi_device_state state)
> switch (oldstate) {
> case SDEV_RUNNING:
> case SDEV_CREATED_BLOCK:
> + case SDEV_QUIESCE:
> case SDEV_OFFLINE:
> break;
> default:
Looks reasonable because SDEV_BLOCK is one more strict state than
QEIESCE, so:
Reviewed-by: Ming Lei <ming.lei@...ha.com>
Thanks,
Ming
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