6.1-stable review patch. If anyone has any objections, please let me know.
------------------
From: Yu Kuai <yukuai3@xxxxxxxxxx>
[ Upstream commit e24ed04389f9619e0aaef615a8948633c182a8b0 ]
memalloc_noio_save() is called for the first mddev_suspend(), and
repeated mddev_suspend() only increase 'suspended'. However,
memalloc_noio_restore() is also called for the first mddev_resume(),
which means that memory reclaim will be enabled before the last
mddev_resume() is called, while the array is still suspended.
Fix this problem by restore 'noio_flag' for the last mddev_resume().
Fixes: 78f57ef9d50a ("md: use memalloc scope APIs in mddev_suspend()/mddev_resume()")
Signed-off-by: Yu Kuai <yukuai3@xxxxxxxxxx>
Link: https://lore.kernel.org/r/20230628012931.88911-3-yukuai1@xxxxxxxxxxxxxxx
Signed-off-by: Song Liu <song@xxxxxxxxxx>
Signed-off-by: Sasha Levin <sashal@xxxxxxxxxx>
---
drivers/md/md.c | 6 ++++--
1 file changed, 4 insertions(+), 2 deletions(-)
diff --git a/drivers/md/md.c b/drivers/md/md.c
index 1c44294c625a4..443837fe6291e 100644
--- a/drivers/md/md.c
+++ b/drivers/md/md.c
@@ -485,11 +485,13 @@ EXPORT_SYMBOL_GPL(mddev_suspend);
void mddev_resume(struct mddev *mddev)
{
- /* entred the memalloc scope from mddev_suspend() */
- memalloc_noio_restore(mddev->noio_flag);
lockdep_assert_held(&mddev->reconfig_mutex);
if (--mddev->suspended)
return;
+
+ /* entred the memalloc scope from mddev_suspend() */
+ memalloc_noio_restore(mddev->noio_flag);
+
percpu_ref_resurrect(&mddev->active_io);
wake_up(&mddev->sb_wait);
mddev->pers->quiesce(mddev, 0);
--
2.40.1
