diff --git a/include/linux/libata.h b/include/linux/libata.h
index 2e098f9..ce7603a 100644
--- a/include/linux/libata.h
+++ b/include/linux/libata.h
@@ -1197,7 +1197,7 @@
 		return ap->pmp_link;
 	}
 
-	if (++link - ap->pmp_link < ap->nr_pmp_links)
+	if (++link < ap->nr_pmp_links + ap->pmp_link)
 		return link;
 	return NULL;
 }