[PATCH 5.18 0297/1095] dm: return early from dm_pr_call() if DM device is suspended

From: Greg Kroah-Hartman
Date: Mon Aug 15 2022 - 16:54:40 EST


From: Mike Snitzer <snitzer@xxxxxxxxxx>

[ 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@xxxxxxxxxx>
Signed-off-by: Sasha Levin <sashal@xxxxxxxxxx>
---
drivers/md/dm.c | 5 +++++
1 file changed, 5 insertions(+)

diff --git a/drivers/md/dm.c b/drivers/md/dm.c
index f01d33bc3613..e0e28a3203f8 100644
--- a/drivers/md/dm.c
+++ b/drivers/md/dm.c
@@ -2955,6 +2955,11 @@ 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;
--
2.35.1