mISDN: Implement MISDN_CTRL_RX_OFF for more drivers

MISDN_CTRL_RX_OFF is a meachanism to discard RX data in the driver if
the data is not needed by the application. It can be used when playing
mesages, but not recording or with unidirectional protocols.

Signed-off-by: Karsten Keil <kkeil@linux-pingi.de>
Signed-off-by: David S. Miller <davem@davemloft.net>

1 files changed, 6 insertions, 3 deletions

diff --git a/drivers/isdn/hardware/mISDN/hfcmulti.c b/drivers/isdn/hardware/mISDN/hfcmulti.c
index db9b04519829..5e402cf2e795 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 */