diff --git a/drivers/isdn/gigaset/common.c b/drivers/isdn/gigaset/common.c
index 2ea4976..5155c5b 100644
--- a/drivers/isdn/gigaset/common.c
+++ b/drivers/isdn/gigaset/common.c
@@ -521,6 +521,47 @@
 	inbuf->inputstate = inputstate;
 }
 
+/* append received bytes to inbuf */
+int gigaset_fill_inbuf(struct inbuf_t *inbuf, const unsigned char *src,
+		       unsigned numbytes)
+{
+	unsigned n, head, tail, bytesleft;
+
+	gig_dbg(DEBUG_INTR, "received %u bytes", numbytes);
+
+	if (!numbytes)
+		return 0;
+
+	bytesleft = numbytes;
+	tail = atomic_read(&inbuf->tail);
+	head = atomic_read(&inbuf->head);
+	gig_dbg(DEBUG_INTR, "buffer state: %u -> %u", head, tail);
+
+	while (bytesleft) {
+		if (head > tail)
+			n = head - 1 - tail;
+		else if (head == 0)
+			n = (RBUFSIZE-1) - tail;
+		else
+			n = RBUFSIZE - tail;
+		if (!n) {
+			dev_err(inbuf->cs->dev,
+				"buffer overflow (%u bytes lost)", bytesleft);
+			break;
+		}
+		if (n > bytesleft)
+			n = bytesleft;
+		memcpy(inbuf->data + tail, src, n);
+		bytesleft -= n;
+		tail = (tail + n) % RBUFSIZE;
+		src += n;
+	}
+	gig_dbg(DEBUG_INTR, "setting tail to %u", tail);
+	atomic_set(&inbuf->tail, tail);
+	return numbytes != bytesleft;
+}
+EXPORT_SYMBOL_GPL(gigaset_fill_inbuf);
+
 /* Initialize the b-channel structure */
 static struct bc_state *gigaset_initbcs(struct bc_state *bcs,
 					struct cardstate *cs, int channel)
diff --git a/drivers/isdn/gigaset/gigaset.h b/drivers/isdn/gigaset/gigaset.h
index 7acae34..446a078 100644
--- a/drivers/isdn/gigaset/gigaset.h
+++ b/drivers/isdn/gigaset/gigaset.h
@@ -902,47 +902,9 @@
 /* bitwise byte inversion table */
 extern __u8 gigaset_invtab[];	/* in common.c */
 
-
 /* append received bytes to inbuf */
-static inline int gigaset_fill_inbuf(struct inbuf_t *inbuf,
-				     const unsigned char *src,
-				     unsigned numbytes)
-{
-	unsigned n, head, tail, bytesleft;
-
-	gig_dbg(DEBUG_INTR, "received %u bytes", numbytes);
-
-	if (!numbytes)
-		return 0;
-
-	bytesleft = numbytes;
-	tail = atomic_read(&inbuf->tail);
-	head = atomic_read(&inbuf->head);
-	gig_dbg(DEBUG_INTR, "buffer state: %u -> %u", head, tail);
-
-	while (bytesleft) {
-		if (head > tail)
-			n = head - 1 - tail;
-		else if (head == 0)
-			n = (RBUFSIZE-1) - tail;
-		else
-			n = RBUFSIZE - tail;
-		if (!n) {
-			dev_err(inbuf->cs->dev,
-				"buffer overflow (%u bytes lost)", bytesleft);
-			break;
-		}
-		if (n > bytesleft)
-			n = bytesleft;
-		memcpy(inbuf->data + tail, src, n);
-		bytesleft -= n;
-		tail = (tail + n) % RBUFSIZE;
-		src += n;
-	}
-	gig_dbg(DEBUG_INTR, "setting tail to %u", tail);
-	atomic_set(&inbuf->tail, tail);
-	return numbytes != bytesleft;
-}
+int gigaset_fill_inbuf(struct inbuf_t *inbuf, const unsigned char *src,
+		       unsigned numbytes);
 
 /* ===========================================================================
  *  Functions implemented in interface.c