diff --git a/[refs] b/[refs]
index 664f0dd4c3c5..2e8d691255c8 100644
--- a/[refs]
+++ b/[refs]
@@ -1,2 +1,2 @@
 ---
-refs/heads/master: 597e608a8492d662736c9bc6aa507dbf1cadc17d
+refs/heads/master: b3251d8045f87eec5d565603345d262cee134fa6
diff --git a/trunk/drivers/isdn/gigaset/usb-gigaset.c b/trunk/drivers/isdn/gigaset/usb-gigaset.c
index 76dbb20f3065..f65cf7db216b 100644
--- a/trunk/drivers/isdn/gigaset/usb-gigaset.c
+++ b/trunk/drivers/isdn/gigaset/usb-gigaset.c
@@ -39,7 +39,8 @@ MODULE_PARM_DESC(cidmode, "Call-ID mode");
 #define GIGASET_MODULENAME "usb_gigaset"
 #define GIGASET_DEVNAME    "ttyGU"
 
-#define IF_WRITEBUF 2000	/* arbitrary limit */
+/* length limit according to Siemens 3070usb-protokoll.doc ch. 2.1 */
+#define IF_WRITEBUF 264
 
 /* Values for the Gigaset M105 Data */
 #define USB_M105_VENDOR_ID	0x0681