From: Mikulas Patocka <mpatocka@xxxxxxxxxx>
3.4.108-rc1 review patch. If anyone has any objections, please let me know.
------------------
commit ab7c7bb6f4ab95dbca96fcfc4463cd69843e3e24 upstream.
__dm_destroy() must take the suspend_lock so that its presuspend and
postsuspend calls do not race with an internal suspend.
Signed-off-by: Mikulas Patocka <mpatocka@xxxxxxxxxx>
Signed-off-by: Mike Snitzer <snitzer@xxxxxxxxxx>
Signed-off-by: Zefan Li <lizefan@xxxxxxxxxx>
---
drivers/md/dm.c | 6 ++++++
1 file changed, 6 insertions(+)
diff --git a/drivers/md/dm.c b/drivers/md/dm.c
index 8780a22..3bfbccc 100644
--- a/drivers/md/dm.c
+++ b/drivers/md/dm.c
@@ -2295,10 +2295,16 @@ static void __dm_destroy(struct mapped_device *md, bool wait)
set_bit(DMF_FREEING, &md->flags);
spin_unlock(&_minor_lock);
+ /*
+ * Take suspend_lock so that presuspend and postsuspend methods
+ * do not race with internal suspend.
+ */
+ mutex_lock(&md->suspend_lock);
if (!dm_suspended_md(md)) {
dm_table_presuspend_targets(map);
dm_table_postsuspend_targets(map);
}
+ mutex_unlock(&md->suspend_lock);
/*
* Rare, but there may be I/O requests still going to complete,
--
1.9.1
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