--- zzzz-none-000/linux-4.4.60/drivers/mmc/card/block.c	2017-04-08 07:53:53.000000000 +0000
+++ dragonfly-4020-701/linux-4.4.60/drivers/mmc/card/block.c	2018-11-08 13:36:17.000000000 +0000
@@ -485,6 +485,14 @@
 	cmd.arg = idata->ic.arg;
 	cmd.flags = idata->ic.flags;
 
+	if (idata->ic.postsleep_max_us < idata->ic.postsleep_min_us) {
+		pr_err("%s: min value: %u must not be greater than max value: %u\n",
+			__func__, idata->ic.postsleep_min_us,
+			idata->ic.postsleep_max_us);
+		WARN_ON(1);
+		return -EPERM;
+	}
+
 	if (idata->buf_bytes) {
 		data.sg = &sg;
 		data.sg_len = 1;