linux-kernel - Re: [PATCH v4 3/8] scsi: pm8001: use sas_find_attached

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Date:   Tue, 27 Sep 2022 09:34:02 +0100
From:   John Garry <john.garry@...wei.com>
To:     Jason Yan <yanaijie@...wei.com>, <martin.petersen@...cle.com>,
        <jejb@...ux.ibm.com>
CC:     <linux-scsi@...r.kernel.org>, <linux-kernel@...r.kernel.org>,
        <hare@...e.com>, <hch@....de>, <bvanassche@....org>,
        <jinpu.wang@...ud.ionos.com>, <damien.lemoal@...nsource.wdc.com>,
        Jack Wang <jinpu.wang@...os.com>
Subject: Re: [PATCH v4 3/8] scsi: pm8001: use sas_find_attached_phy() instead
 of open coded

On 27/09/2022 04:26, Jason Yan wrote:
> +++ b/drivers/scsi/pm8001/pm8001_sas.c
> @@ -645,22 +645,16 @@ static int pm8001_dev_found_notify(struct domain_device *dev)
>   	pm8001_device->dcompletion = &completion;
>   	if (parent_dev && dev_is_expander(parent_dev->dev_type)) {
>   		int phy_id;
> -		struct ex_phy *phy;
> -		for (phy_id = 0; phy_id < parent_dev->ex_dev.num_phys;
> -		phy_id++) {
> -			phy = &parent_dev->ex_dev.ex_phy[phy_id];
> -			if (SAS_ADDR(phy->attached_sas_addr)
> -				== SAS_ADDR(dev->sas_addr)) {
> -				pm8001_device->attached_phy = phy_id;
> -				break;
> -			}
> -		}
> -		if (phy_id == parent_dev->ex_dev.num_phys) {
> +
> +		phy_id = sas_find_attached_phy(&parent_dev->ex_dev, dev);
> +		if (phy_id == -ENODEV) {
>   			pm8001_dbg(pm8001_ha, FAIL,
>   				   "Error: no attached dev:%016llx at ex:%016llx.\n",
>   				   SAS_ADDR(dev->sas_addr),
>   				   SAS_ADDR(parent_dev->sas_addr));
>   			res = -1;

I think that you can just pass the linux error code (-ENODEV) back here.

And for hisi_sas we change to -EINVAL for this code. I don't think it's 
required, so I think that we can pass -ENODEV back there also. Using 
-EINVAL seems to come from when the code was originally added in 
abda97c2fe874 and from a quick glance libsas does not seem to have 
special processing for -EINVAL.

Thanks,
John

> +		} else {
> +			pm8001_device->attached_phy = phy_id;
>   		}
>   	} else {
>   		if (dev->dev_type == SAS_SATA