linux-kernel - Re: [PATCH v3 6/8] scsi: libsas: use sas_phy_match_dev

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Message-ID: <585db20d-8530-d605-ebf2-e8d669e693a8@opensource.wdc.com>
Date:   Tue, 27 Sep 2022 11:30:03 +0900
From:   Damien Le Moal <damien.lemoal@...nsource.wdc.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,
        john.garry@...wei.com, jinpu.wang@...ud.ionos.com
Subject: Re: [PATCH v3 6/8] scsi: libsas: use sas_phy_match_dev_addr() instead
 of open coded

On 9/27/22 11:29, Jason Yan wrote:
> The sas address comparation of domain device and expander phy is open
> coded. Now we can replace it with sas_phy_match_dev_addr().
> 
> Signed-off-by: Jason Yan <yanaijie@...wei.com>
> ---
>  drivers/scsi/libsas/sas_expander.c | 18 ++++++------------
>  1 file changed, 6 insertions(+), 12 deletions(-)
> 
> diff --git a/drivers/scsi/libsas/sas_expander.c b/drivers/scsi/libsas/sas_expander.c
> index df5a64ad902f..b2b5103c3e76 100644
> --- a/drivers/scsi/libsas/sas_expander.c
> +++ b/drivers/scsi/libsas/sas_expander.c
> @@ -738,9 +738,7 @@ static void sas_ex_get_linkrate(struct domain_device *parent,
>  		    phy->phy_state == PHY_NOT_PRESENT)
>  			continue;
>  
> -		if (SAS_ADDR(phy->attached_sas_addr) ==
> -		    SAS_ADDR(child->sas_addr)) {
> -
> +		if (sas_phy_match_dev_addr(child, phy)) {
>  			child->min_linkrate = min(parent->min_linkrate,
>  						  phy->linkrate);
>  			child->max_linkrate = max(parent->max_linkrate,
> @@ -1012,8 +1010,7 @@ static int sas_ex_discover_dev(struct domain_device *dev, int phy_id)
>  		sas_add_parent_port(dev, phy_id);
>  		return 0;
>  	}
> -	if (dev->parent && (SAS_ADDR(ex_phy->attached_sas_addr) ==
> -			    SAS_ADDR(dev->parent->sas_addr))) {
> +	if (dev->parent && sas_phy_match_dev_addr(dev->parent, ex_phy)) {
>  		sas_add_parent_port(dev, phy_id);
>  		if (ex_phy->routing_attr == TABLE_ROUTING)
>  			sas_configure_phy(dev, phy_id, dev->port->sas_addr, 1);
> @@ -1312,7 +1309,7 @@ static int sas_check_parent_topology(struct domain_device *child)
>  		    parent_phy->phy_state == PHY_NOT_PRESENT)
>  			continue;
>  
> -		if (SAS_ADDR(parent_phy->attached_sas_addr) != SAS_ADDR(child->sas_addr))
> +		if (sas_phy_match_dev_addr(child, parent_phy))

This changes the test. This should be:

		if (!sas_phy_match_dev_addr(child, parent_phy))

No ?

>  			continue;
>  
>  		child_phy = &child_ex->ex_phy[parent_phy->attached_phy_id];
> @@ -1522,8 +1519,7 @@ static int sas_configure_parent(struct domain_device *parent,
>  		struct ex_phy *phy = &ex_parent->ex_phy[i];
>  
>  		if ((phy->routing_attr == TABLE_ROUTING) &&
> -		    (SAS_ADDR(phy->attached_sas_addr) ==
> -		     SAS_ADDR(child->sas_addr))) {
> +		    sas_phy_match_dev_addr(child, phy)) {
>  			res = sas_configure_phy(parent, i, sas_addr, include);
>  			if (res)
>  				return res;
> @@ -1858,8 +1854,7 @@ static void sas_unregister_devs_sas_addr(struct domain_device *parent,
>  	if (last) {
>  		list_for_each_entry_safe(child, n,
>  			&ex_dev->children, siblings) {
> -			if (SAS_ADDR(child->sas_addr) ==
> -			    SAS_ADDR(phy->attached_sas_addr)) {
> +			if (sas_phy_match_dev_addr(child, phy)) {
>  				set_bit(SAS_DEV_GONE, &child->state);
>  				if (dev_is_expander(child->dev_type))
>  					sas_unregister_ex_tree(parent->port, child);
> @@ -1941,8 +1936,7 @@ static int sas_discover_new(struct domain_device *dev, int phy_id)
>  	if (res)
>  		return res;
>  	list_for_each_entry(child, &dev->ex_dev.children, siblings) {
> -		if (SAS_ADDR(child->sas_addr) ==
> -		    SAS_ADDR(ex_phy->attached_sas_addr)) {
> +		if (sas_phy_match_dev_addr(child, ex_phy)) {
>  			if (dev_is_expander(child->dev_type))
>  				res = sas_discover_bfs_by_root(child);
>  			break;

-- 
Damien Le Moal
Western Digital Research