linux-kernel - [PATCH v4 05/49] maple_tree: Fix handle of invalidated state in mas_wr_store

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Message-Id: <20230120162650.984577-6-Liam.Howlett@oracle.com>
Date:   Fri, 20 Jan 2023 11:26:06 -0500
From:   "Liam R. Howlett" <Liam.Howlett@...cle.com>
To:     linux-mm@...ck.org, linux-kernel@...r.kernel.org,
        Andrew Morton <akpm@...ux-foundation.org>,
        maple-tree@...ts.infradead.org
Cc:     "Liam R. Howlett" <Liam.Howlett@...cle.com>,
        SeongJae Park <sj@...nel.org>
Subject: [PATCH v4 05/49] maple_tree: Fix handle of invalidated state in mas_wr_store_setup()

If an invalidated maple state is encountered during write, reset the
maple state to MAS_START.  This will result in a re-walk of the tree to
the correct location for the write.

Link: https://lore.kernel.org/all/20230107020126.1627-1-sj@kernel.org/
Reported-by: SeongJae Park <sj@...nel.org>
Signed-off-by: Liam R. Howlett <Liam.Howlett@...cle.com>
---
 lib/maple_tree.c | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/lib/maple_tree.c b/lib/maple_tree.c
index 1af09c6f7810..14ce355e4149 100644
--- a/lib/maple_tree.c
+++ b/lib/maple_tree.c
@@ -5608,6 +5608,9 @@ static inline void mte_destroy_walk(struct maple_enode *enode,
 
 static void mas_wr_store_setup(struct ma_wr_state *wr_mas)
 {
+	if (unlikely(mas_is_paused(wr_mas->mas)))
+		mas_reset(wr_mas->mas);
+
 	if (!mas_is_start(wr_mas->mas)) {
 		if (mas_is_none(wr_mas->mas)) {
 			mas_reset(wr_mas->mas);
-- 
2.35.1