diff --git a/drivers/isdn/hardware/mISDN/avmfritz.c b/drivers/isdn/hardware/mISDN/avmfritz.c
index 255037b..793cef9 100644
--- a/drivers/isdn/hardware/mISDN/avmfritz.c
+++ b/drivers/isdn/hardware/mISDN/avmfritz.c
@@ -408,13 +408,18 @@ hdlc_empty_fifo(struct bchannel *bch, int count)
 	struct fritzcard *fc = bch->hw;
 
 	pr_debug("%s: %s %d\n", fc->name, __func__, count);
-	cnt = bchannel_get_rxbuf(bch, count);
-	if (cnt < 0) {
-		pr_warning("%s.B%d: No bufferspace for %d bytes\n",
-			   fc->name, bch->nr, count);
-		return;
+	if (test_bit(FLG_RX_OFF, &bch->Flags)) {
+		p = NULL;
+		bch->dropcnt += count;
+	} else {
+		cnt = bchannel_get_rxbuf(bch, count);
+		if (cnt < 0) {
+			pr_warning("%s.B%d: No bufferspace for %d bytes\n",
+				   fc->name, bch->nr, count);
+			return;
+		}
+		p = skb_put(bch->rx_skb, count);
 	}
-	p = skb_put(bch->rx_skb, count);
 	ptr = (u32 *)p;
 	if (AVM_FRITZ_PCIV2 == fc->type)
 		addr = fc->addr + (bch->nr == 2 ?
@@ -426,11 +431,13 @@ hdlc_empty_fifo(struct bchannel *bch, int count)
 	cnt = 0;
 	while (cnt < count) {
 		val = le32_to_cpu(inl(addr));
-		put_unaligned(val, ptr);
-		ptr++;
+		if (p) {
+			put_unaligned(val, ptr);
+			ptr++;
+		}
 		cnt += 4;
 	}
-	if (debug & DEBUG_HW_BFIFO) {
+	if (p && (debug & DEBUG_HW_BFIFO)) {
 		snprintf(fc->log, LOG_SIZE, "B%1d-recv %s %d ",
 			 bch->nr, fc->name, count);
 		print_hex_dump_bytes(fc->log, DUMP_PREFIX_OFFSET, p, count);
diff --git a/drivers/isdn/hardware/mISDN/hfcmulti.c b/drivers/isdn/hardware/mISDN/hfcmulti.c
index 3f87377..1f227f5 100644
--- a/drivers/isdn/hardware/mISDN/hfcmulti.c
+++ b/drivers/isdn/hardware/mISDN/hfcmulti.c
@@ -2224,8 +2224,11 @@ next_frame:
 	HFC_wait_nodebug(hc);
 
 	/* ignore if rx is off BUT change fifo (above) to start pending TX */
-	if (hc->chan[ch].rx_off)
+	if (hc->chan[ch].rx_off) {
+		if (bch)
+			bch->dropcnt += poll; /* not exact but fair enough */
 		return;
+	}
 
 	if (dch || test_bit(FLG_HDLC, &bch->Flags)) {
 		f1 = HFC_inb_nodebug(hc, A_F1);
@@ -3575,10 +3578,10 @@ channel_bctrl(struct bchannel *bch, struct mISDN_ctrl_req *cq)
 	switch (cq->op) {
 	case MISDN_CTRL_GETOP:
 		ret = mISDN_ctrl_bchannel(bch, cq);
-		cq->op |= MISDN_CTRL_HFC_OP | MISDN_CTRL_HW_FEATURES_OP |
-			  MISDN_CTRL_RX_OFF;
+		cq->op |= MISDN_CTRL_HFC_OP | MISDN_CTRL_HW_FEATURES_OP;
 		break;
 	case MISDN_CTRL_RX_OFF: /* turn off / on rx stream */
+		ret = mISDN_ctrl_bchannel(bch, cq);
 		hc->chan[bch->slot].rx_off = !!cq->p1;
 		if (!hc->chan[bch->slot].rx_off) {
 			/* reset fifo on rx on */
diff --git a/drivers/isdn/hardware/mISDN/hfcpci.c b/drivers/isdn/hardware/mISDN/hfcpci.c
index 7fbd1cc..4797b48 100644
--- a/drivers/isdn/hardware/mISDN/hfcpci.c
+++ b/drivers/isdn/hardware/mISDN/hfcpci.c
@@ -572,6 +572,11 @@ hfcpci_empty_fifo_trans(struct bchannel *bch, struct bzfifo *rxbz,
 	fcnt_tx = B_FIFO_SIZE - fcnt_tx;
 	/* remaining bytes to send (bytes in tx-fifo) */
 
+	if (test_bit(FLG_RX_OFF, &bch->Flags)) {
+		bch->dropcnt += fcnt_rx;
+		*z2r = cpu_to_le16(new_z2);
+		return;
+	}
 	maxlen = bchannel_get_rxbuf(bch, fcnt_rx);
 	if (maxlen < 0) {
 		pr_warning("B%d: No bufferspace for %d bytes\n",
diff --git a/drivers/isdn/hardware/mISDN/hfcsusb.c b/drivers/isdn/hardware/mISDN/hfcsusb.c
index da0886d..70b5998 100644
--- a/drivers/isdn/hardware/mISDN/hfcsusb.c
+++ b/drivers/isdn/hardware/mISDN/hfcsusb.c
@@ -842,6 +842,11 @@ hfcsusb_rx_frame(struct usb_fifo *fifo, __u8 *data, unsigned int len,
 		hdlc = 1;
 	}
 	if (fifo->bch) {
+		if (test_bit(FLG_RX_OFF, &fifo->bch->Flags)) {
+			fifo->bch->dropcnt += len;
+			spin_unlock(&hw->lock);
+			return;
+		}
 		maxlen = bchannel_get_rxbuf(fifo->bch, len);
 		rx_skb = fifo->bch->rx_skb;
 		if (maxlen < 0) {
diff --git a/drivers/isdn/hardware/mISDN/mISDNipac.c b/drivers/isdn/hardware/mISDN/mISDNipac.c
index 8266382..acbcf48 100644
--- a/drivers/isdn/hardware/mISDN/mISDNipac.c
+++ b/drivers/isdn/hardware/mISDN/mISDNipac.c
@@ -936,6 +936,11 @@ hscx_empty_fifo(struct hscx_hw *hscx, u8 count)
 	int maxlen;
 
 	pr_debug("%s: B%1d %d\n", hscx->ip->name, hscx->bch.nr, count);
+	if (test_bit(FLG_RX_OFF, &hscx->bch.Flags)) {
+		hscx->bch.dropcnt += count;
+		hscx_cmdr(hscx, 0x80); /* RMC */
+		return;
+	}
 	maxlen = bchannel_get_rxbuf(&hscx->bch, count);
 	if (maxlen < 0) {
 		hscx_cmdr(hscx, 0x80); /* RMC */
diff --git a/drivers/isdn/hardware/mISDN/mISDNisar.c b/drivers/isdn/hardware/mISDN/mISDNisar.c
index 415cf81..1632729 100644
--- a/drivers/isdn/hardware/mISDN/mISDNisar.c
+++ b/drivers/isdn/hardware/mISDN/mISDNisar.c
@@ -429,6 +429,11 @@ isar_rcv_frame(struct isar_ch *ch)
 		ch->is->write_reg(ch->is->hw, ISAR_IIA, 0);
 		return;
 	}
+	if (test_bit(FLG_RX_OFF, &ch->bch.Flags)) {
+		ch->bch.dropcnt += ch->is->clsb;
+		ch->is->write_reg(ch->is->hw, ISAR_IIA, 0);
+		return;
+	}
 	switch (ch->bch.state) {
 	case ISDN_P_NONE:
 		pr_debug("%s: ISAR protocol 0 spurious IIS_RDATA %x/%x/%x\n",
diff --git a/drivers/isdn/hardware/mISDN/netjet.c b/drivers/isdn/hardware/mISDN/netjet.c
index 01869ac..9287805 100644
--- a/drivers/isdn/hardware/mISDN/netjet.c
+++ b/drivers/isdn/hardware/mISDN/netjet.c
@@ -386,6 +386,10 @@ read_dma(struct tiger_ch *bc, u32 idx, int cnt)
 			bc->bch.nr, idx);
 	}
 	bc->lastrx = idx;
+	if (test_bit(FLG_RX_OFF, &bc->bch.Flags)) {
+		bc->bch.dropcnt += cnt;
+		return;
+	}
 	stat = bchannel_get_rxbuf(&bc->bch, cnt);
 	/* only transparent use the count here, HDLC overun is detected later */
 	if (stat == ENOMEM) {
diff --git a/drivers/isdn/hardware/mISDN/w6692.c b/drivers/isdn/hardware/mISDN/w6692.c
index a0d713f..bad8905 100644
--- a/drivers/isdn/hardware/mISDN/w6692.c
+++ b/drivers/isdn/hardware/mISDN/w6692.c
@@ -475,6 +475,11 @@ W6692_empty_Bfifo(struct w6692_ch *wch, int count)
 			skb_trim(wch->bch.rx_skb, 0);
 		return;
 	}
+	if (test_bit(FLG_RX_OFF, &wch->bch.Flags)) {
+		wch->bch.dropcnt += count;
+		WriteW6692B(wch, W_B_CMDR, W_B_CMDR_RACK | W_B_CMDR_RACT);
+		return;
+	}
 	maxlen = bchannel_get_rxbuf(&wch->bch, count);
 	if (maxlen < 0) {
 		WriteW6692B(wch, W_B_CMDR, W_B_CMDR_RACK | W_B_CMDR_RACT);
diff --git a/drivers/isdn/mISDN/hwchannel.c b/drivers/isdn/mISDN/hwchannel.c
index c55e7bc..46504ab 100644
--- a/drivers/isdn/mISDN/hwchannel.c
+++ b/drivers/isdn/mISDN/hwchannel.c
@@ -142,6 +142,8 @@ mISDN_clear_bchannel(struct bchannel *ch)
 	test_and_clear_bit(FLG_ACTIVE, &ch->Flags);
 	test_and_clear_bit(FLG_FILLEMPTY, &ch->Flags);
 	test_and_clear_bit(FLG_TX_EMPTY, &ch->Flags);
+	test_and_clear_bit(FLG_RX_OFF, &ch->Flags);
+	ch->dropcnt = 0;
 	ch->minlen = ch->init_minlen;
 	ch->next_minlen = ch->init_minlen;
 	ch->maxlen = ch->init_maxlen;
@@ -167,7 +169,8 @@ mISDN_ctrl_bchannel(struct bchannel *bch, struct mISDN_ctrl_req *cq)
 
 	switch (cq->op) {
 	case MISDN_CTRL_GETOP:
-		cq->op = MISDN_CTRL_RX_BUFFER | MISDN_CTRL_FILL_EMPTY;
+		cq->op = MISDN_CTRL_RX_BUFFER | MISDN_CTRL_FILL_EMPTY |
+			 MISDN_CTRL_RX_OFF;
 		break;
 	case MISDN_CTRL_FILL_EMPTY:
 		if (cq->p1) {
@@ -177,6 +180,15 @@ mISDN_ctrl_bchannel(struct bchannel *bch, struct mISDN_ctrl_req *cq)
 			test_and_clear_bit(FLG_FILLEMPTY, &bch->Flags);
 		}
 		break;
+	case MISDN_CTRL_RX_OFF:
+		/* read back dropped byte count */
+		cq->p2 = bch->dropcnt;
+		if (cq->p1)
+			test_and_set_bit(FLG_RX_OFF, &bch->Flags);
+		else
+			test_and_clear_bit(FLG_RX_OFF, &bch->Flags);
+		bch->dropcnt = 0;
+		break;
 	case MISDN_CTRL_RX_BUFFER:
 		if (cq->p2 > MISDN_CTRL_RX_SIZE_IGNORE)
 			bch->next_maxlen = cq->p2;
diff --git a/include/linux/mISDNhw.h b/include/linux/mISDNhw.h
index d577b0a..d111320 100644
--- a/include/linux/mISDNhw.h
+++ b/include/linux/mISDNhw.h
@@ -73,6 +73,8 @@
 #define FLG_LL_CONN		25
 #define FLG_DTMFSEND		26
 #define FLG_TX_EMPTY		27
+/* stop sending received data upstream */
+#define FLG_RX_OFF		28
 /* workq events */
 #define FLG_RECVQUEUE		30
 #define	FLG_PHCHANGE		31
@@ -173,6 +175,7 @@ struct bchannel {
 	int			err_crc;
 	int			err_tx;
 	int			err_rx;
+	int			dropcnt;
 };
 
 extern int	mISDN_initdchannel(struct dchannel *, int, void *);
