[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_expander.c b/drivers/scsi/libsas/sas_expander.c
index 1b831c5..15d2239 100644
--- a/drivers/scsi/libsas/sas_expander.c
+++ b/drivers/scsi/libsas/sas_expander.c
@@ -657,10 +657,11 @@
if (phy->attached_sata_host || phy->attached_sata_ps)
return NULL;
- child = kzalloc(sizeof(*child), GFP_KERNEL);
+ child = sas_alloc_device();
if (!child)
return NULL;
+ kref_get(&parent->kref);
child->parent = parent;
child->port = parent->port;
child->iproto = phy->attached_iproto;
@@ -762,7 +763,7 @@
sas_port_delete(phy->port);
out_err:
phy->port = NULL;
- kfree(child);
+ sas_put_device(child);
return NULL;
}
@@ -809,7 +810,7 @@
phy->attached_phy_id);
return NULL;
}
- child = kzalloc(sizeof(*child), GFP_KERNEL);
+ child = sas_alloc_device();
if (!child)
return NULL;
@@ -835,6 +836,7 @@
child->rphy = rphy;
edev = rphy_to_expander_device(rphy);
child->dev_type = phy->attached_dev_type;
+ kref_get(&parent->kref);
child->parent = parent;
child->port = port;
child->iproto = phy->attached_iproto;
@@ -858,7 +860,7 @@
spin_lock_irq(&parent->port->dev_list_lock);
list_del(&child->dev_list_node);
spin_unlock_irq(&parent->port->dev_list_lock);
- kfree(child);
+ sas_put_device(child);
return NULL;
}
list_add_tail(&child->siblings, &parent->ex_dev.children);