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[SCSI] scsi_transport_sas: add expander backlink

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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: James Bottomley <James.Bottomley@SteelEye.com>
This commit is contained in:
James Bottomley 2006-07-09 12:38:19 -05:00 committed by James Bottomley
parent 631c228cd0
commit a0e1b6ef3b
2 changed files with 23 additions and 0 deletions
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20
drivers/scsi/scsi_transport_sas.c
View file

@ -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.
*/

3
include/scsi/scsi_transport_sas.h
View file

@ -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 *