From a0e1b6ef3b851fe6f1dcc259432e83de79ce5e7f Mon Sep 17 00:00:00 2001 From: James Bottomley Date: Sun, 9 Jul 2006 12:38:19 -0500 Subject: [PATCH] [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: James Bottomley --- drivers/scsi/scsi_transport_sas.c | 20 ++++++++++++++++++++ include/scsi/scsi_transport_sas.h | 3 +++ 2 files changed, 23 insertions(+) diff --git a/drivers/scsi/scsi_transport_sas.c b/drivers/scsi/scsi_transport_sas.c index 9bb4e37a1a61..7871bc25fafb 100644 --- a/drivers/scsi/scsi_transport_sas.c +++ b/drivers/scsi/scsi_transport_sas.c @@ -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. */ diff --git a/include/scsi/scsi_transport_sas.h b/include/scsi/scsi_transport_sas.h index f5772ff61d0d..6cc2314098cf 100644 --- a/include/scsi/scsi_transport_sas.h +++ b/include/scsi/scsi_transport_sas.h @@ -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 * -- 2.30.2