linux-kernel - Re: [PATCH v3] qla2xxx: Return EBUSY on fcport deletion

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Date:   Tue, 13 Oct 2020 10:59:18 +1100 (AEDT)
From:   Finn Thain <fthain@...egraphics.com.au>
To:     Daniel Wagner <dwagner@...e.de>
cc:     Nilesh Javali <njavali@...vell.com>, Arun Easi <aeasi@...vell.com>,
        linux-scsi@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH v3] qla2xxx: Return EBUSY on fcport deletion


On Mon, 12 Oct 2020, Daniel Wagner wrote:

> When the fcport is about to be deleted we should return EBUSY instead
> of ENODEV. Only for EBUSY the request will be requeued in a multipath
> setup.
> 
> Also in case we have a valid qpair but the firmware has not yet
> started return EBUSY to avoid dropping the request.
> 
> Signed-off-by: Daniel Wagner <dwagner@...e.de>
> ---
> 
> v3: simplify test logic as suggested by Arun.

Not exactly a "simplification": there was a change of behaviour between v2 
and v3. It seems the commit log no longer reflects the code.

> v2: rebased on mkp/staging
> 
>  drivers/scsi/qla2xxx/qla_nvme.c | 6 ++++--
>  1 file changed, 4 insertions(+), 2 deletions(-)
> 
> diff --git a/drivers/scsi/qla2xxx/qla_nvme.c b/drivers/scsi/qla2xxx/qla_nvme.c
> index 2cd9bd288910..1fa457a5736e 100644
> --- a/drivers/scsi/qla2xxx/qla_nvme.c
> +++ b/drivers/scsi/qla2xxx/qla_nvme.c
> @@ -555,10 +555,12 @@ static int qla_nvme_post_cmd(struct nvme_fc_local_port *lport,
>  
>  	fcport = qla_rport->fcport;
>  
> -	if (!qpair || !fcport || (qpair && !qpair->fw_started) ||
> -	    (fcport && fcport->deleted))
> +	if (!qpair || !fcport)
>  		return -ENODEV;
>  
> +	if (!qpair->fw_started || fcport->deleted)
> +		return -EBUSY;
> +
>  	vha = fcport->vha;
>  
>  	if (!(fcport->nvme_flag & NVME_FLAG_REGISTERED))
>