[PATCH] mm,memory_hotplug: set failure reason in offline_pages()

[Dan Carpenter <dan.carpenter@linaro.org>]

The "reason" variable is uninitialized on this error path.  It's supposed
to explain why the function failed.

Fixes: e4e2806b639c ("mm,memory_hotplug: implement numa node notifier")
Signed-off-by: Dan Carpenter <dan.carpenter@linaro.org>
---
 mm/memory_hotplug.c | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/mm/memory_hotplug.c b/mm/memory_hotplug.c
index 4d864b4fb891..e954f81b55a0 100644
--- a/mm/memory_hotplug.c
+++ b/mm/memory_hotplug.c
@@ -1977,8 +1977,10 @@ int offline_pages(unsigned long start_pfn, unsigned long nr_pages,
 		node_arg.nid = node;
 		ret = node_notify(NODE_REMOVING_LAST_MEMORY, &node_arg);
 		ret = notifier_to_errno(ret);
-		if (ret)
+		if (ret) {
+			reason = "nr_pages more than present_pages";
 			goto failed_removal_isolated;
+		}
 	}
 
 	ret = memory_notify(MEM_GOING_OFFLINE, &mem_arg);