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mISDN: Implement MISDN_CTRL_RX_OFF for more drivers

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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>
This commit is contained in:
Karsten Keil
2012-05-15 23:51:08 +00:00
committed by David S. Miller
parent 6d1ee48fd0
commit c27b46e7f1
10 changed files with 67 additions and 13 deletions
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5
drivers/isdn/hardware/mISDN/hfcsusb.c
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@@ -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) {