diff --git a/drivers/remoteproc/omap_remoteproc.c b/drivers/remoteproc/omap_remoteproc.c
index 604499275896492952b779e9a526f0c34cbb9844..5bccb5840a02546837d29eada857d68a792411d5 100644
--- a/drivers/remoteproc/omap_remoteproc.c
+++ b/drivers/remoteproc/omap_remoteproc.c
@@ -130,6 +130,12 @@ static void omap_rproc_mbox_callback(struct mbox_client *client, void *data)
 		dev_info(dev, "received echo reply from %s\n", name);
 		break;
 	default:
+		if (msg >= RP_MBOX_READY && msg < RP_MBOX_END_MSG)
+			return;
+		if (msg > oproc->rproc->max_notifyid) {
+			dev_dbg(dev, "dropping unknown message 0x%x", msg);
+			return;
+		}
 		/* msg contains the index of the triggered vring */
 		if (rproc_vq_interrupt(oproc->rproc, msg) == IRQ_NONE)
 			dev_dbg(dev, "no message was found in vqid %d\n", msg);
diff --git a/drivers/remoteproc/omap_remoteproc.h b/drivers/remoteproc/omap_remoteproc.h
index f6d2036d383d671a14167160a721bde820e910d6..72f656c93caa63e2378f8ef5d3b6dd93ff9008cb 100644
--- a/drivers/remoteproc/omap_remoteproc.h
+++ b/drivers/remoteproc/omap_remoteproc.h
@@ -56,6 +56,12 @@
  *
  * @RP_MBOX_ABORT_REQUEST: a "please crash" request, used for testing the
  * recovery mechanism (to some extent).
+ *
+ * Introduce new message definitions if any here.
+ *
+ * @RP_MBOX_END_MSG: Indicates end of known/defined messages from remote core
+ * This should be the last definition.
+ *
  */
 enum omap_rp_mbox_messages {
 	RP_MBOX_READY		= 0xFFFFFF00,
@@ -64,6 +70,7 @@ enum omap_rp_mbox_messages {
 	RP_MBOX_ECHO_REQUEST	= 0xFFFFFF03,
 	RP_MBOX_ECHO_REPLY	= 0xFFFFFF04,
 	RP_MBOX_ABORT_REQUEST	= 0xFFFFFF05,
+	RP_MBOX_END_MSG		= 0xFFFFFF06,
 };
 
 #endif /* _OMAP_RPMSG_H */