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scsi: iscsi: Fail session and connection on transport registration failure

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If the transport cannot be registered, the session/connection creation
needs to be failed early to let the initiator know.  Otherwise, the system
will have an outstanding connection that cannot be used nor removed by
open-iscsi. The result is similar to the error below, triggered by
injecting a failure in the transport's registration path.

openiscsi reports success:

root@debian-vm:~#  iscsiadm -m node -T iqn:lun1 -p 127.0.0.1 -l
Logging in to [iface: default, target: iqn:lun1, portal: 127.0.0.1,3260]
Login to [iface: default, target: iqn:lun1, portal:127.0.0.1,3260] successful.

But cannot remove the session afterwards, since the kernel is in an
inconsistent state.

root@debian-vm:~#  iscsiadm -m node -T iqn:lun1 -p 127.0.0.1 -u
iscsiadm: No matching sessions found

Link: https://lore.kernel.org/r/20200106185817.640331-4-krisman@collabora.com
Signed-off-by: Gabriel Krisman Bertazi <krisman@collabora.com>
Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>
This commit is contained in:
Gabriel Krisman Bertazi 2020-01-06 13:58:17 -05:00 committed by Martin K. Petersen
parent cd7ea70bb0
commit f3c893e3db
1 changed files with 16 additions and 2 deletions
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18
drivers/scsi/scsi_transport_iscsi.c
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@ -2093,7 +2093,12 @@ int iscsi_add_session(struct iscsi_cls_session *session, unsigned int target_id)
"could not register session's dev\n");
goto release_ida;
}
transport_register_device(&session->dev);
err = transport_register_device(&session->dev);
if (err) {
iscsi_cls_session_printk(KERN_ERR, session,
"could not register transport's dev\n");
goto release_dev;
}
spin_lock_irqsave(&sesslock, flags);
list_add(&session->sess_list, &sesslist);
@ -2103,6 +2108,8 @@ int iscsi_add_session(struct iscsi_cls_session *session, unsigned int target_id)
ISCSI_DBG_TRANS_SESSION(session, "Completed session adding\n");
return 0;
release_dev:
device_del(&session->dev);
release_ida:
if (session->ida_used)
ida_simple_remove(&iscsi_sess_ida, session->target_id);
@ -2263,7 +2270,12 @@ iscsi_create_conn(struct iscsi_cls_session *session, int dd_size, uint32_t cid)
"register connection's dev\n");
goto release_parent_ref;
}
transport_register_device(&conn->dev);
err = transport_register_device(&conn->dev);
if (err) {
iscsi_cls_session_printk(KERN_ERR, session, "could not "
"register transport's dev\n");
goto release_conn_ref;
}
spin_lock_irqsave(&connlock, flags);
list_add(&conn->conn_list, &connlist);
@ -2272,6 +2284,8 @@ iscsi_create_conn(struct iscsi_cls_session *session, int dd_size, uint32_t cid)
ISCSI_DBG_TRANS_CONN(conn, "Completed conn creation\n");
return conn;
release_conn_ref:
put_device(&conn->dev);
release_parent_ref:
put_device(&session->dev);
free_conn: