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From:   Miaohe Lin <linmiaohe@huawei.com>
To:     <akpm@linux-foundation.org>, <naoya.horiguchi@nec.com>
CC:     <linux-mm@kvack.org>, <linux-kernel@vger.kernel.org>,
        <linmiaohe@huawei.com>
Subject: [PATCH v2 3/6] mm, hwpoison: fix extra put_page() in soft_offline_page()
Date:   Tue, 23 Aug 2022 11:23:43 +0800
Message-ID: <20220823032346.4260-4-linmiaohe@huawei.com>
In-Reply-To: <20220823032346.4260-1-linmiaohe@huawei.com>
References: <20220823032346.4260-1-linmiaohe@huawei.com>
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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.

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>
---
 mm/memory-failure.c | 2 --
 1 file changed, 2 deletions(-)

diff --git a/mm/memory-failure.c b/mm/memory-failure.c
index ecd42d717c6f..1d79e693f1b9 100644
--- a/mm/memory-failure.c
+++ b/mm/memory-failure.c
@@ -2575,8 +2575,6 @@ int soft_offline_page(unsigned long pfn, int flags)
 	if (hwpoison_filter(page)) {
 		if (ret > 0)
 			put_page(page);
-		else
-			put_ref_page(ref_page);
 
 		mutex_unlock(&mf_mutex);
 		return -EOPNOTSUPP;
-- 
2.23.0