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Commit a0e1b6ef authored by James Bottomley's avatar James Bottomley Committed by James Bottomley
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[SCSI] scsi_transport_sas: add expander backlink 



This patch adds the ability to add a backlink to a particular port.  The
idea is to represent properly ports on expanders that are used
specifically for linking to the parent device in the topology.

Signed-off-by: default avatarJames Bottomley <James.Bottomley@SteelEye.com>
parent 631c228c

drivers/scsi/scsi_transport_sas.c

+20 −0
Original line number Diff line number Diff line
@@ -692,6 +692,13 @@ void sas_port_delete(struct sas_port *port) 
	}

	mutex_unlock(&port->phy_list_mutex);



	if (port->is_backlink) {

		struct device *parent = port->dev.parent;



		sysfs_remove_link(&port->dev.kobj, parent->bus_id);

		port->is_backlink = 0;

	}



	transport_remove_device(dev);

	device_del(dev);

	transport_destroy_device(dev);
@@ -767,6 +774,19 @@ void sas_port_delete_phy(struct sas_port *port, struct sas_phy *phy) 
}

EXPORT_SYMBOL(sas_port_delete_phy);



void sas_port_mark_backlink(struct sas_port *port)

{

	struct device *parent = port->dev.parent->parent->parent;



	if (port->is_backlink)

		return;

	port->is_backlink = 1;

	sysfs_create_link(&port->dev.kobj, &parent->kobj,

			  parent->bus_id);



}

EXPORT_SYMBOL(sas_port_mark_backlink);



/*

 * SAS remote PHY attributes.

 */

include/scsi/scsi_transport_sas.h

+3 −0
Original line number Diff line number Diff line
@@ -130,6 +130,8 @@ struct sas_port { 


	int			port_identifier;

	int			num_phys;

	/* port flags */

	unsigned int		is_backlink:1;



	/* the other end of the link */

	struct sas_rphy		*rphy;
@@ -175,6 +177,7 @@ void sas_port_free(struct sas_port *); 
void sas_port_delete(struct sas_port *);

void sas_port_add_phy(struct sas_port *, struct sas_phy *);

void sas_port_delete_phy(struct sas_port *, struct sas_phy *);

void sas_port_mark_backlink(struct sas_port *);

int scsi_is_sas_port(const struct device *);



extern struct scsi_transport_template *