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maple_tree: fix handle of invalidated state in mas_wr_store_setup()

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commit 1202700c3f upstream.

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
Cc: <Stable@vger.kernel.org>
Fixes: 54a611b605 ("Maple Tree: add new data structure")
Signed-off-by: Liam R. Howlett <Liam.Howlett@oracle.com>
Reported-by: SeongJae Park <sj@kernel.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Liam R. Howlett 2023-04-11 11:10:45 -04:00 committed by Greg Kroah-Hartman
parent 8ccada581b
commit 820c13f92c
1 changed files with 3 additions and 0 deletions
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3
lib/maple_tree.c
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@ -5599,6 +5599,9 @@ 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);