1 files changed, 30 insertions, 15 deletions

diff --git a/drivers/md/dm.c b/drivers/md/dm.c
index 447e132d09b5..56aa2a8b9d71 100644
--- a/drivers/md/dm.c
+++ b/drivers/md/dm.c
@@ -2057,6 +2057,7 @@ static void cleanup_mapped_device(struct mapped_device *md)
 static struct mapped_device *alloc_dev(int minor)
 {
 	int r, numa_node_id = dm_get_numa_node();
+	struct dax_device *dax_dev;
 	struct mapped_device *md;
 	void *old_md;
 
@@ -2125,15 +2126,15 @@ static struct mapped_device *alloc_dev(int minor)
 	md->disk->private_data = md;
 	sprintf(md->disk->disk_name, "dm-%d", minor);
 
-	if (IS_ENABLED(CONFIG_FS_DAX)) {
-		md->dax_dev = alloc_dax(md, &dm_dax_ops);
-		if (IS_ERR(md->dax_dev)) {
-			md->dax_dev = NULL;
+	dax_dev = alloc_dax(md, &dm_dax_ops);
+	if (IS_ERR(dax_dev)) {
+		if (PTR_ERR(dax_dev) != -EOPNOTSUPP)
 			goto bad;
-		}
-		set_dax_nocache(md->dax_dev);
-		set_dax_nomc(md->dax_dev);
-		if (dax_add_host(md->dax_dev, md->disk))
+	} else {
+		set_dax_nocache(dax_dev);
+		set_dax_nomc(dax_dev);
+		md->dax_dev = dax_dev;
+		if (dax_add_host(dax_dev, md->disk))
 			goto bad;
 	}
 
@@ -2948,6 +2949,9 @@ static void __dm_internal_suspend(struct mapped_device *md, unsigned int suspend
 
 static void __dm_internal_resume(struct mapped_device *md)
 {
+	int r;
+	struct dm_table *map;
+
 	BUG_ON(!md->internal_suspend_count);
 
 	if (--md->internal_suspend_count)
@@ -2956,12 +2960,23 @@ static void __dm_internal_resume(struct mapped_device *md)
 	if (dm_suspended_md(md))
 		goto done; /* resume from nested suspend */
 
-	/*
-	 * NOTE: existing callers don't need to call dm_table_resume_targets
-	 * (which may fail -- so best to avoid it for now by passing NULL map)
-	 */
-	(void) __dm_resume(md, NULL);
-
+	map = rcu_dereference_protected(md->map, lockdep_is_held(&md->suspend_lock));
+	r = __dm_resume(md, map);
+	if (r) {
+		/*
+		 * If a preresume method of some target failed, we are in a
+		 * tricky situation. We can't return an error to the caller. We
+		 * can't fake success because then the "resume" and
+		 * "postsuspend" methods would not be paired correctly, and it
+		 * would break various targets, for example it would cause list
+		 * corruption in the "origin" target.
+		 *
+		 * So, we fake normal suspend here, to make sure that the
+		 * "resume" and "postsuspend" methods will be paired correctly.
+		 */
+		DMERR("Preresume method failed: %d", r);
+		set_bit(DMF_SUSPENDED, &md->flags);
+	}
 done:
 	clear_bit(DMF_SUSPENDED_INTERNALLY, &md->flags);
 	smp_mb__after_atomic();
@@ -3515,5 +3530,5 @@ module_param(swap_bios, int, 0644);
 MODULE_PARM_DESC(swap_bios, "Maximum allowed inflight swap IOs");
 
 MODULE_DESCRIPTION(DM_NAME " driver");
-MODULE_AUTHOR("Joe Thornber <dm-devel@redhat.com>");
+MODULE_AUTHOR("Joe Thornber <dm-devel@lists.linux.dev>");
 MODULE_LICENSE("GPL");