mISDN: Reduce RX buffer allocation for transparent data
We did allways allocate maxsize buffers, but for transparent data we know
the actual size.
Use a common function to calculate size and detect overflows.
Signed-off-by: Karsten Keil <kkeil@linux-pingi.de>
Signed-off-by: David S. Miller <davem@davemloft.net>
diff --git a/drivers/isdn/hardware/mISDN/mISDNisar.c b/drivers/isdn/hardware/mISDN/mISDNisar.c
index 9deea88..4169bb2d 100644
--- a/drivers/isdn/hardware/mISDN/mISDNisar.c
+++ b/drivers/isdn/hardware/mISDN/mISDNisar.c
@@ -421,7 +421,8 @@
static inline void
isar_rcv_frame(struct isar_ch *ch)
{
- u8 *ptr;
+ u8 *ptr;
+ int maxlen;
if (!ch->is->clsb) {
pr_debug("%s; ISAR zero len frame\n", ch->is->name);
@@ -437,36 +438,22 @@
case ISDN_P_B_RAW:
case ISDN_P_B_L2DTMF:
case ISDN_P_B_MODEM_ASYNC:
- if (!ch->bch.rx_skb) {
- ch->bch.rx_skb = mI_alloc_skb(ch->bch.maxlen,
- GFP_ATOMIC);
- if (unlikely(!ch->bch.rx_skb)) {
- pr_info("%s: B receive out of memory\n",
- ch->is->name);
- ch->is->write_reg(ch->is->hw, ISAR_IIA, 0);
- break;
- }
+ maxlen = bchannel_get_rxbuf(&ch->bch, ch->is->clsb);
+ if (maxlen < 0) {
+ pr_warning("%s.B%d: No bufferspace for %d bytes\n",
+ ch->is->name, ch->bch.nr, ch->is->clsb);
+ ch->is->write_reg(ch->is->hw, ISAR_IIA, 0);
+ break;
}
rcv_mbox(ch->is, skb_put(ch->bch.rx_skb, ch->is->clsb));
recv_Bchannel(&ch->bch, 0);
break;
case ISDN_P_B_HDLC:
- if (!ch->bch.rx_skb) {
- ch->bch.rx_skb = mI_alloc_skb(ch->bch.maxlen,
- GFP_ATOMIC);
- if (unlikely(!ch->bch.rx_skb)) {
- pr_info("%s: B receive out of memory\n",
- ch->is->name);
- ch->is->write_reg(ch->is->hw, ISAR_IIA, 0);
- break;
- }
- }
- if ((ch->bch.rx_skb->len + ch->is->clsb) >
- (ch->bch.maxlen + 2)) {
- pr_debug("%s: incoming packet too large\n",
- ch->is->name);
+ maxlen = bchannel_get_rxbuf(&ch->bch, ch->is->clsb);
+ if (maxlen < 0) {
+ pr_warning("%s.B%d: No bufferspace for %d bytes\n",
+ ch->is->name, ch->bch.nr, ch->is->clsb);
ch->is->write_reg(ch->is->hw, ISAR_IIA, 0);
- skb_trim(ch->bch.rx_skb, 0);
break;
}
if (ch->is->cmsb & HDLC_ERROR) {