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authorMike Christie <michaelc@cs.wisc.edu>2006-06-28 12:00:27 -0500
committerJames Bottomley <jejb@mulgrave.il.steeleye.com>2006-06-29 11:08:10 -0400
commitf53a88da18e3c04c3ade07bc5eff520ee4259c3e (patch)
treea3b89b4d0e621d5dbf051fd7b2191de7f053d312 /drivers/scsi
parent5c75b7fcf0c0e3921391fd93f5fa58ec9a6c428f (diff)
[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>
Diffstat (limited to 'drivers/scsi')
-rw-r--r--drivers/scsi/libiscsi.c8
-rw-r--r--drivers/scsi/scsi_transport_iscsi.c10
2 files changed, 9 insertions, 9 deletions
diff --git a/drivers/scsi/libiscsi.c b/drivers/scsi/libiscsi.c
index 7c76a989b21..7e6e031cc41 100644
--- a/drivers/scsi/libiscsi.c
+++ b/drivers/scsi/libiscsi.c
@@ -1287,13 +1287,18 @@ iscsi_session_setup(struct iscsi_transport *iscsit,
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 @@ void iscsi_session_teardown(struct iscsi_cls_session *cls_session)
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 147c854e1d4..8717ff51ba4 100644
--- a/drivers/scsi/scsi_transport_iscsi.c
+++ b/drivers/scsi/scsi_transport_iscsi.c
@@ -228,13 +228,11 @@ static struct iscsi_cls_conn *iscsi_conn_lookup(uint32_t sid, uint32_t cid)
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 @@ iscsi_create_session(struct Scsi_Host *shost,
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 @@ iscsi_create_session(struct Scsi_Host *shost,
free_session:
kfree(session);
-module_put:
- module_put(transport->owner);
return NULL;
}