1 files changed, 7 insertions, 2 deletions
diff --git a/zaptel.c b/zaptel.c
index c775817..fa988a7 100755
--- a/zaptel.c
+++ b/zaptel.c
@@ -2014,8 +2014,13 @@ static int zt_open(struct inode *inode, struct file *file)
 	/* Minor 0: Special "control" descriptor */
 	if (!unit) 
 		return zt_ctl_open(inode, file);
-	if (unit == 253)
-		return zt_timing_open(inode, file);
+	if (unit == 253) {
+		if (maxspans) {
+			return zt_timing_open(inode, file);
+		} else {
+			return -ENXIO;
+		}
+	}
 	if (unit == 254)
 		return zt_chan_open(inode, file);
 	if (unit == 255) {