--- a/drivers/tty/n_gsm.c
+++ n/drivers/tty/n_gsm.c
@@ -3016,7 +3016,7 @@ static ssize_t gsmld_write(struct tty_st
 	int space;
 	int ret;
 
-	if (!gsm)
+	if (!gsm || gsm->dead || !gsm->receive)
 		return -ENODEV;
 
 	ret = -ENOBUFS;