1 files changed, 6 insertions, 1 deletions

diff --git a/net/caif/cfdgml.c b/net/caif/cfdgml.c
index 53194840ecb6..ed9d53aff280 100644
--- a/net/caif/cfdgml.c
+++ b/net/caif/cfdgml.c
@@ -17,6 +17,7 @@
 #define DGM_FLOW_OFF 0x81
 #define DGM_FLOW_ON  0x80
 #define DGM_CTRL_PKT_SIZE 1
+#define DGM_MTU 1500
 
 static int cfdgml_receive(struct cflayer *layr, struct cfpkt *pkt);
 static int cfdgml_transmit(struct cflayer *layr, struct cfpkt *pkt);
@@ -30,7 +31,7 @@ struct cflayer *cfdgml_create(u8 channel_id, struct dev_info *dev_info)
         }
         caif_assert(offsetof(struct cfsrvl, layer) == 0);
         memset(dgm, 0, sizeof(struct cfsrvl));
-        cfsrvl_init(dgm, channel_id, dev_info);
+        cfsrvl_init(dgm, channel_id, dev_info, true);
         dgm->layer.receive = cfdgml_receive;
         dgm->layer.transmit = cfdgml_transmit;
         snprintf(dgm->layer.name, CAIF_LAYER_NAME_SZ - 1, "dgm%d", channel_id);
@@ -89,6 +90,10 @@ static int cfdgml_transmit(struct cflayer *layr, struct cfpkt *pkt)
         if (!cfsrvl_ready(service, &ret))
                 return ret;
 
+        /* STE Modem cannot handle more than 1500 bytes datagrams */
+        if (cfpkt_getlen(pkt) > DGM_MTU)
+                return -EMSGSIZE;
+
         cfpkt_add_head(pkt, &zero, 4);
 
         /* Add info for MUX-layer to route the packet out. */