From: Mike Snitzer <snitzer@kernel.org>
Date: Fri, 22 Jul 2022 19:31:23 +0000 (-0400)
Subject: dm: return early from dm_pr_call() if DM device is suspended
X-Git-Tag: v4.19.256~220
X-Git-Url: http://git.ipfire.org/gitweb.cgi?a=commitdiff_plain;h=4f040ba9f15d047f173ecc01d3bba3d1e9fbee08;p=thirdparty%2Fkernel%2Fstable.git

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>
---

diff --git a/drivers/md/dm.c b/drivers/md/dm.c
index d2ee97cd7d14e..324d1dd58e2bc 100644
--- a/drivers/md/dm.c
+++ b/drivers/md/dm.c
@@ -3122,6 +3122,11 @@ 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;