[SCSI] iscsi: fix session refcouting
iscsi_tcp and iser cannot be rmmod from the kernel when sessions
are running because session removal is driven from userspace. For
those modules we get a module reference when a session is
created then drop it when the session is removed.
For qla4xxx, they can jsut remove the sessions from the pci remove
function like normal HW drivers, so this patch moves the module
reference from the transport class functions shared by all
drivers to the libiscsi functions only used be software iscsi
modules.
Signed-off-by: Mike Christie <michaelc@cs.wisc.edu>
Signed-off-by: James Bottomley <James.Bottomley@SteelEye.com>
diff --git a/drivers/scsi/libiscsi.c b/drivers/scsi/libiscsi.c
index 7c76a98..7e6e031 100644
--- a/drivers/scsi/libiscsi.c
+++ b/drivers/scsi/libiscsi.c
@@ -1287,13 +1287,18 @@
if (scsi_add_host(shost, NULL))
goto add_host_fail;
+ if (!try_module_get(iscsit->owner))
+ goto cls_session_fail;
+
cls_session = iscsi_create_session(shost, iscsit, 0);
if (!cls_session)
- goto cls_session_fail;
+ goto module_put;
*(unsigned long*)shost->hostdata = (unsigned long)cls_session;
return cls_session;
+module_put:
+ module_put(iscsit->owner);
cls_session_fail:
scsi_remove_host(shost);
add_host_fail:
@@ -1325,6 +1330,7 @@
iscsi_destroy_session(cls_session);
scsi_host_put(shost);
+ module_put(cls_session->transport->owner);
}
EXPORT_SYMBOL_GPL(iscsi_session_teardown);
diff --git a/drivers/scsi/scsi_transport_iscsi.c b/drivers/scsi/scsi_transport_iscsi.c
index 147c854..8717ff5 100644
--- a/drivers/scsi/scsi_transport_iscsi.c
+++ b/drivers/scsi/scsi_transport_iscsi.c
@@ -228,13 +228,11 @@
static void iscsi_session_release(struct device *dev)
{
struct iscsi_cls_session *session = iscsi_dev_to_session(dev);
- struct iscsi_transport *transport = session->transport;
struct Scsi_Host *shost;
shost = iscsi_session_to_shost(session);
scsi_host_put(shost);
kfree(session);
- module_put(transport->owner);
}
static int iscsi_is_session_dev(const struct device *dev)
@@ -305,13 +303,11 @@
struct iscsi_cls_session *session;
int err;
- if (!try_module_get(transport->owner))
- return NULL;
-
session = kzalloc(sizeof(*session) + transport->sessiondata_size,
GFP_KERNEL);
if (!session)
- goto module_put;
+ return NULL;
+
session->transport = transport;
session->recovery_tmo = 120;
INIT_WORK(&session->recovery_work, session_recovery_timedout, session);
@@ -349,8 +345,6 @@
free_session:
kfree(session);
-module_put:
- module_put(transport->owner);
return NULL;
}
