xen: scsiback: add LUN of restored domain

When a xen domain is being restored the LUN state of a pvscsi device
is "Connected" and not "Initialising" as in case of attaching a new
pvscsi LUN.

This must be taken into account when adding a new pvscsi device for
a domain as otherwise the pvscsi LUN won't be connected to the
SCSI target associated with it.

Signed-off-by: Juergen Gross <jgross@suse.com>
Reviewed-by: Boris Ostrovsky <boris.ostrovsky@oracle.com>
Signed-off-by: David Vrabel <david.vrabel@citrix.com>

1 files changed, 14 insertions, 5 deletions

diff --git a/drivers/xen/xen-scsiback.c b/drivers/xen/xen-scsiback.c
index d0b0bc549355..2eab75892c23 100644
--- a/drivers/xen/xen-scsiback.c
+++ b/drivers/xen/xen-scsiback.c
@@ -990,7 +990,7 @@ found:
 }
 
 static void scsiback_do_add_lun(struct vscsibk_info *info, const char *state,
-                                char *phy, struct ids_tuple *vir)
+                                char *phy, struct ids_tuple *vir, int try)
 {
         if (!scsiback_add_translation_entry(info, phy, vir)) {
                 if (xenbus_printf(XBT_NIL, info->dev->nodename, state,
@@ -998,7 +998,7 @@ static void scsiback_do_add_lun(struct vscsibk_info *info, const char *state,
                         pr_err("xenbus_printf error %s\n", state);
                         scsiback_del_translation_entry(info, vir);
                 }
-        } else {
+        } else if (!try) {
                 xenbus_printf(XBT_NIL, info->dev->nodename, state,
                               "%d", XenbusStateClosed);
         }
@@ -1058,10 +1058,19 @@ static void scsiback_do_1lun_hotplug(struct vscsibk_info *info, int op,
 
         switch (op) {
         case VSCSIBACK_OP_ADD_OR_DEL_LUN:
-                if (device_state == XenbusStateInitialising)
-                        scsiback_do_add_lun(info, state, phy, &vir);
-                if (device_state == XenbusStateClosing)
+                switch (device_state) {
+                case XenbusStateInitialising:
+                        scsiback_do_add_lun(info, state, phy, &vir, 0);
+                        break;
+                case XenbusStateConnected:
+                        scsiback_do_add_lun(info, state, phy, &vir, 1);
+                        break;
+                case XenbusStateClosing:
                         scsiback_do_del_lun(info, state, &vir);
+                        break;
+                default:
+                        break;
+                }
                 break;
 
         case VSCSIBACK_OP_UPDATEDEV_STATE: