[SCSI] libsas: fix domain_device leak
Arrange for the deallocation of a struct domain_device object when it no
longer has:
1/ any children
2/ references by any scsi_targets
3/ references by a lldd
The comment about domain_device lifetime in
Documentation/scsi/libsas.txt is stale as it appears mainline never had
a version of a struct domain_device that was registered as a kobject.
We now manage domain_device reference counts on behalf of external
agents.
Reviewed-by: Jack Wang <jack_wang@usish.com>
Signed-off-by: Dan Williams <dan.j.williams@intel.com>
Signed-off-by: James Bottomley <JBottomley@Parallels.com>
diff --git a/drivers/scsi/libsas/sas_discover.c b/drivers/scsi/libsas/sas_discover.c
index 54a5199..4e64930 100644
--- a/drivers/scsi/libsas/sas_discover.c
+++ b/drivers/scsi/libsas/sas_discover.c
@@ -36,8 +36,6 @@
void sas_init_dev(struct domain_device *dev)
{
- INIT_LIST_HEAD(&dev->siblings);
- INIT_LIST_HEAD(&dev->dev_list_node);
switch (dev->dev_type) {
case SAS_END_DEV:
break;
@@ -73,14 +71,14 @@
struct sas_rphy *rphy;
struct domain_device *dev;
- dev = kzalloc(sizeof(*dev), GFP_KERNEL);
+ dev = sas_alloc_device();
if (!dev)
return -ENOMEM;
spin_lock_irqsave(&port->phy_list_lock, flags);
if (list_empty(&port->phy_list)) {
spin_unlock_irqrestore(&port->phy_list_lock, flags);
- kfree(dev);
+ sas_put_device(dev);
return -ENODEV;
}
phy = container_of(port->phy_list.next, struct asd_sas_phy, port_phy_el);
@@ -130,7 +128,7 @@
}
if (!rphy) {
- kfree(dev);
+ sas_put_device(dev);
return -ENODEV;
}
rphy->identify.phy_identifier = phy->phy->identify.phy_identifier;
@@ -173,6 +171,7 @@
dev_name(sas_ha->dev),
SAS_ADDR(dev->sas_addr), res);
}
+ kref_get(&dev->kref);
}
return res;
}
@@ -184,8 +183,10 @@
struct Scsi_Host *shost = sas_ha->core.shost;
struct sas_internal *i = to_sas_internal(shost->transportt);
- if (i->dft->lldd_dev_gone)
+ if (i->dft->lldd_dev_gone) {
i->dft->lldd_dev_gone(dev);
+ sas_put_device(dev);
+ }
}
/* ---------- Common/dispatchers ---------- */
@@ -219,6 +220,20 @@
/* ---------- Device registration and unregistration ---------- */
+void sas_free_device(struct kref *kref)
+{
+ struct domain_device *dev = container_of(kref, typeof(*dev), kref);
+
+ if (dev->parent)
+ sas_put_device(dev->parent);
+
+ /* remove the phys and ports, everything else should be gone */
+ if (dev->dev_type == EDGE_DEV || dev->dev_type == FANOUT_DEV)
+ kfree(dev->ex_dev.ex_phy);
+
+ kfree(dev);
+}
+
static void sas_unregister_common_dev(struct asd_sas_port *port, struct domain_device *dev)
{
sas_notify_lldd_dev_gone(dev);
@@ -230,6 +245,8 @@
spin_lock_irq(&port->dev_list_lock);
list_del_init(&dev->dev_list_node);
spin_unlock_irq(&port->dev_list_lock);
+
+ sas_put_device(dev);
}
void sas_unregister_dev(struct asd_sas_port *port, struct domain_device *dev)
@@ -239,11 +256,6 @@
sas_rphy_delete(dev->rphy);
dev->rphy = NULL;
}
- if (dev->dev_type == EDGE_DEV || dev->dev_type == FANOUT_DEV) {
- /* remove the phys and ports, everything else should be gone */
- kfree(dev->ex_dev.ex_phy);
- dev->ex_dev.ex_phy = NULL;
- }
sas_unregister_common_dev(port, dev);
}
@@ -322,7 +334,7 @@
list_del_init(&dev->dev_list_node);
spin_unlock_irq(&port->dev_list_lock);
- kfree(dev); /* not kobject_register-ed yet */
+ sas_put_device(dev);
port->port_dev = NULL;
}