linux-kernel - [PATCH] maple_tree: Fix handle of invalidated state in mas_wr_store

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Date:   Mon, 9 Jan 2023 16:55:42 +0000
From:   Liam Howlett <liam.howlett@...cle.com>
To:     "linux-mm@...ck.org" <linux-mm@...ck.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        Andrew Morton <akpm@...ux-foundation.org>,
        "maple-tree@...ts.infradead.org" <maple-tree@...ts.infradead.org>
CC:     Liam Howlett <liam.howlett@...cle.com>,
        SeongJae Park <sj@...nel.org>
Subject: [PATCH] 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 14cff87cf058..59c4879ac714 100644
--- a/lib/maple_tree.c
+++ b/lib/maple_tree.c
@@ -5620,6 +5620,9 @@ 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