From 1202700c3f8cc5f7e4646c3cf05ee6f7c8bc6ccf Mon Sep 17 00:00:00 2001
From: "Liam R. Howlett" <Liam.Howlett@oracle.com>
Date: Fri, 20 Jan 2023 11:26:06 -0500
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/
Link: https://lkml.kernel.org/r/20230120162650.984577-6-Liam.Howlett@oracle.com
Signed-off-by: Liam R. Howlett <Liam.Howlett@oracle.com>
Reported-by: SeongJae Park <sj@kernel.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
---
lib/maple_tree.c | 3 +++
1 file changed, 3 insertions(+)
diff --git a/lib/maple_tree.c b/lib/maple_tree.c
index 5804c5997598d..7c786bd5e575a 100644
--- a/lib/maple_tree.c
+++ b/lib/maple_tree.c
@@ -5609,6 +5609,9 @@ 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);
--
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