From b7e2d64d673abdecae8b8f3f44ef37820e7e8f6c Mon Sep 17 00:00:00 2001
From: Mike Snitzer <snitzer@kernel.org>
Date: Fri, 22 Jul 2022 15:31:23 -0400
Subject: [PATCH] dm: return early from dm_pr_call() if DM device is suspended

[ Upstream commit e120a5f1e78fab6223544e425015f393d90d6f0d ]

Otherwise PR ops may be issued while the broader DM device is being
reconfigured, etc.

Fixes: 9c72bad1f31a ("dm: call PR reserve/unreserve on each underlying device")
Signed-off-by: Mike Snitzer <snitzer@kernel.org>
Signed-off-by: Sasha Levin <sashal@kernel.org>
---
 drivers/md/dm.c | 5 +++++
 1 file changed, 5 insertions(+)

diff --git a/drivers/md/dm.c b/drivers/md/dm.c
index ab0e2338e47e..1005abf76860 100644
--- a/drivers/md/dm.c
+++ b/drivers/md/dm.c
@@ -3003,6 +3003,11 @@ static int dm_call_pr(struct block_device *bdev, iterate_devices_callout_fn fn,
 		goto out;
 	ti = dm_table_get_target(table, 0);
 
+	if (dm_suspended_md(md)) {
+		ret = -EAGAIN;
+		goto out;
+	}
+
 	ret = -EINVAL;
 	if (!ti->type->iterate_devices)
 		goto out;