mm, hwpoison: fix extra put_page() in soft_offline_page()

When hwpoison_filter() refuses to soft offline a page, the page refcnt
incremented previously by MF_COUNT_INCREASED would have been consumed via
get_hwpoison_page() if ret <= 0.  So the put_ref_page() here will put the
extra one.  Remove it to fix the issue.

Link: https://lkml.kernel.org/r/20220818130016.45313-4-linmiaohe@huawei.com
Fixes: 9113eaf331bf ("mm/memory-failure.c: add hwpoison_filter for soft offline")
Signed-off-by: Miaohe Lin <linmiaohe@huawei.com>
Acked-by: Naoya Horiguchi <naoya.horiguchi@nec.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>

diff --git a/mm/memory-failure.c b/mm/memory-failure.c
index f391818..799176d 100644 (file)
--- a/mm/memory-failure.c
+++ b/mm/memory-failure.c
@@ -2591,8 +2591,6 @@ retry:
        if (hwpoison_filter(page)) {
                if (ret > 0)
                        put_page(page);
-               else
-                       put_ref_page(ref_page);
 
                mutex_unlock(&mf_mutex);
                return -EOPNOTSUPP;