ehea: Fix memory hotplug support

This patch implements the memory notifier to update the busmap
instantly instead of rebuilding the whole map. This is necessary
because walk_memory_resource provides different information than
required during memory hotplug.

Signed-off-by: Hannes Hering <hering2@de.ibm.com>
Signed-off-by: Jeff Garzik <jgarzik@redhat.com>

1 files changed, 15 insertions, 10 deletions

diff --git a/drivers/net/ehea/ehea_main.c b/drivers/net/ehea/ehea_main.c
index b70c5314f537..422fcb93e2c3 100644
--- a/drivers/net/ehea/ehea_main.c
+++ b/drivers/net/ehea/ehea_main.c
@@ -2863,7 +2863,7 @@ static void ehea_rereg_mrs(struct work_struct *work)
         struct ehea_adapter *adapter;
 
         mutex_lock(&dlpar_mem_lock);
-        ehea_info("LPAR memory enlarged - re-initializing driver");
+        ehea_info("LPAR memory changed - re-initializing driver");
 
         list_for_each_entry(adapter, &adapter_list, list)
                 if (adapter->active_ports) {
@@ -2900,13 +2900,6 @@ static void ehea_rereg_mrs(struct work_struct *work)
                         }
                 }
 
-        ehea_destroy_busmap();
-        ret = ehea_create_busmap();
-        if (ret) {
-                ehea_error("creating ehea busmap failed");
-                goto out;
-        }
-
         clear_bit(__EHEA_STOP_XFER, &ehea_driver_flags);
 
         list_for_each_entry(adapter, &adapter_list, list)
@@ -3519,9 +3512,21 @@ void ehea_crash_handler(void)
 static int ehea_mem_notifier(struct notifier_block *nb,
                              unsigned long action, void *data)
 {
+        struct memory_notify *arg = data;
         switch (action) {
-        case MEM_OFFLINE:
-                ehea_info("memory has been removed");
+        case MEM_CANCEL_OFFLINE:
+                ehea_info("memory offlining canceled");
+                /* Readd canceled memory block */
+        case MEM_ONLINE:
+                ehea_info("memory is going online");
+                if (ehea_add_sect_bmap(arg->start_pfn, arg->nr_pages))
+                        return NOTIFY_BAD;
+                ehea_rereg_mrs(NULL);
+                break;
+        case MEM_GOING_OFFLINE:
+                ehea_info("memory is going offline");
+                if (ehea_rem_sect_bmap(arg->start_pfn, arg->nr_pages))
+                        return NOTIFY_BAD;
                 ehea_rereg_mrs(NULL);
                 break;
         default: