[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_internal.h b/drivers/scsi/libsas/sas_internal.h
index 14e21b5..0d43408 100644
--- a/drivers/scsi/libsas/sas_internal.h
+++ b/drivers/scsi/libsas/sas_internal.h
@@ -76,6 +76,8 @@
void sas_hae_reset(struct work_struct *work);
+void sas_free_device(struct kref *kref);
+
#ifdef CONFIG_SCSI_SAS_HOST_SMP
extern int sas_smp_host_handler(struct Scsi_Host *shost, struct request *req,
struct request *rsp);
@@ -161,4 +163,21 @@
sas_port_add_phy(ex->parent_port, ex_phy->phy);
}
+static inline struct domain_device *sas_alloc_device(void)
+{
+ struct domain_device *dev = kzalloc(sizeof(*dev), GFP_KERNEL);
+
+ if (dev) {
+ INIT_LIST_HEAD(&dev->siblings);
+ INIT_LIST_HEAD(&dev->dev_list_node);
+ kref_init(&dev->kref);
+ }
+ return dev;
+}
+
+static inline void sas_put_device(struct domain_device *dev)
+{
+ kref_put(&dev->kref, sas_free_device);
+}
+
#endif /* _SAS_INTERNAL_H_ */