diff --git a/drivers/dax/fsdev.c b/drivers/dax/fsdev.c
index 57c589e19b53..d50891d6dc13 100644
--- a/drivers/dax/fsdev.c
+++ b/drivers/dax/fsdev.c
@@ -342,8 +342,12 @@ static int fsdev_dax_probe(struct dev_dax *dev_dax)
 		u64 phys = dev_dax->ranges[0].range.start;
 		u64 pgmap_phys = pgmap[0].range.start;
 
-		if (!WARN_ON(pgmap_phys > phys))
-			data_offset = phys - pgmap_phys;
+		if (pgmap_phys > phys) {
+			dev_err(dev, "pgmap start %#llx exceeds data start %#llx\n",
+				pgmap_phys, phys);
+			return -EINVAL;
+		}
+		data_offset = phys - pgmap_phys;
 
 		pr_debug("%s: offset detected phys=%llx pgmap_phys=%llx offset=%llx\n",
 		       __func__, phys, pgmap_phys, data_offset);