[SCSI] zfcp: Ensure all work is cancelled on adapter dequeue

A scheduled work might still be pending, running while the adapter is
in progress to get dequeued from the system. This can lead to an
invalid pointer dereference (Oops).  Once the adpater is set online
again, ensure the nameserver environment is initialized to the
appropriate values again.

Signed-off-by: Swen Schillig <swen@vnet.ibm.com>
Signed-off-by: Christof Schmitt <christof.schmitt@de.ibm.com>
Signed-off-by: James Bottomley <James.Bottomley@HansenPartnership.com>

3 files changed, 8 insertions, 4 deletions

diff --git a/drivers/s390/scsi/zfcp_aux.c b/drivers/s390/scsi/zfcp_aux.c
index c4d07be6279a..616c60ffcf2c 100644
--- a/drivers/s390/scsi/zfcp_aux.c
+++ b/drivers/s390/scsi/zfcp_aux.c
@@ -524,7 +524,6 @@ int zfcp_adapter_enqueue(struct ccw_device *ccw_device)
                 goto sysfs_failed;
 
         atomic_clear_mask(ZFCP_STATUS_COMMON_REMOVE, &adapter->status);
-        zfcp_fc_nameserver_init(adapter);
 
         if (!zfcp_adapter_scsi_register(adapter))
                 return 0;
diff --git a/drivers/s390/scsi/zfcp_ccw.c b/drivers/s390/scsi/zfcp_ccw.c
index 3aeef289fe7c..1fe1e2eda512 100644
--- a/drivers/s390/scsi/zfcp_ccw.c
+++ b/drivers/s390/scsi/zfcp_ccw.c
@@ -3,7 +3,7 @@
  *
  * Registration and callback for the s390 common I/O layer.
  *
- * Copyright IBM Corporation 2002, 2008
+ * Copyright IBM Corporation 2002, 2009
  */
 
 #define KMSG_COMPONENT "zfcp"
@@ -108,6 +108,7 @@ static int zfcp_ccw_set_online(struct ccw_device *ccw_device)
         /* initialize request counter */
         BUG_ON(!zfcp_reqlist_isempty(adapter));
         adapter->req_no = 0;
+        zfcp_fc_nameserver_init(adapter);
 
         zfcp_erp_modify_adapter_status(adapter, "ccsonl1", NULL,
                                        ZFCP_STATUS_COMMON_RUNNING, ZFCP_SET);
diff --git a/drivers/s390/scsi/zfcp_fc.c b/drivers/s390/scsi/zfcp_fc.c
index c22c47868550..aab8123c5966 100644
--- a/drivers/s390/scsi/zfcp_fc.c
+++ b/drivers/s390/scsi/zfcp_fc.c
@@ -98,8 +98,12 @@ static void zfcp_wka_port_offline(struct work_struct *work)
         struct zfcp_wka_port *wka_port =
                         container_of(dw, struct zfcp_wka_port, work);
 
-        wait_event(wka_port->completion_wq,
-                        atomic_read(&wka_port->refcount) == 0);
+        /* Don't wait forvever. If the wka_port is too busy take it offline
+           through a new call later */
+        if (!wait_event_timeout(wka_port->completion_wq,
+                                atomic_read(&wka_port->refcount) == 0,
+                                HZ >> 1))
+                return;
 
         mutex_lock(&wka_port->mutex);
         if ((atomic_read(&wka_port->refcount) != 0) ||