linux-kernel - Re: [PATCH] scsi: pm80xx: Set phy_attached to zero when device is gone

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Date:   Wed, 17 May 2023 14:21:55 +0100
From:   John Garry <john.g.garry@...cle.com>
To:     Pranav Prasad <pranavpp@...gle.com>,
        Jack Wang <jinpu.wang@...ud.ionos.com>,
        "James E . J . Bottomley" <jejb@...ux.ibm.com>,
        "Martin K . Petersen" <martin.petersen@...cle.com>
Cc:     linux-scsi@...r.kernel.org, linux-kernel@...r.kernel.org,
        Igor Pylypiv <ipylypiv@...gle.com>
Subject: Re: [PATCH] scsi: pm80xx: Set phy_attached to zero when device is
 gone

On 16/05/2023 18:57, Pranav Prasad wrote:
> From: Igor Pylypiv <ipylypiv@...gle.com>
> 
> Set phy_attached to zero when device is gone.
> 
> Signed-off-by: Igor Pylypiv <ipylypiv@...gle.com>
> Signed-off-by: Pranav Prasad <pranavpp@...gle.com>
> ---
>   drivers/scsi/pm8001/pm8001_sas.c | 1 +
>   1 file changed, 1 insertion(+)
> 
> diff --git a/drivers/scsi/pm8001/pm8001_sas.c b/drivers/scsi/pm8001/pm8001_sas.c
> index e5673c774f66..c57fc671509d 100644
> --- a/drivers/scsi/pm8001/pm8001_sas.c
> +++ b/drivers/scsi/pm8001/pm8001_sas.c
> @@ -706,6 +706,7 @@ static void pm8001_dev_gone_notify(struct domain_device *dev)
>   			spin_lock_irqsave(&pm8001_ha->lock, flags);
>   		}
>   		PM8001_CHIP_DISP->dereg_dev_req(pm8001_ha, device_id);
> +		pm8001_ha->phy[pm8001_dev->attached_phy].phy_attached = 0;

Can you factor stuff like this out, so that maintaining these values is 
easier and less error prone?

Check this:
~/linux/drivers/scsi/pm8001> git grep "phy_attached = 0" | wc -l
21


>   		pm8001_free_dev(pm8001_dev);
>   	} else {
>   		pm8001_dbg(pm8001_ha, DISC, "Found dev has gone.\n");