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| author | Karsten Keil <kkeil@linux-pingi.de> | 2012-05-15 23:51:05 +0000 |
|---|---|---|
| committer | David S. Miller <davem@davemloft.net> | 2012-05-16 15:23:28 -0400 |
| commit | 7206e659f689558b41aa058c3040b081cb281d03 (patch) | |
| tree | 2be5bdef5a0bbb9c5763b8c1b1e6fe04b7184cc5 /drivers/isdn/hardware/mISDN/mISDNipac.c | |
| parent | 37952cfa3afdfa5cec39d9d76e80bc3a0e6a910c (diff) | |
| download | linux-7206e659f689558b41aa058c3040b081cb281d03.tar.gz linux-7206e659f689558b41aa058c3040b081cb281d03.tar.bz2 linux-7206e659f689558b41aa058c3040b081cb281d03.zip | |
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>
Diffstat (limited to 'drivers/isdn/hardware/mISDN/mISDNipac.c')
| -rw-r--r-- | drivers/isdn/hardware/mISDN/mISDNipac.c | 20 |
1 files changed, 7 insertions, 13 deletions
diff --git a/drivers/isdn/hardware/mISDN/mISDNipac.c b/drivers/isdn/hardware/mISDN/mISDNipac.c index e4b6d8d51aae..7d109ed35366 100644 --- a/drivers/isdn/hardware/mISDN/mISDNipac.c +++ b/drivers/isdn/hardware/mISDN/mISDNipac.c @@ -933,22 +933,16 @@ static void hscx_empty_fifo(struct hscx_hw *hscx, u8 count) { u8 *p; + int maxlen; pr_debug("%s: B%1d %d\n", hscx->ip->name, hscx->bch.nr, count); - if (!hscx->bch.rx_skb) { - hscx->bch.rx_skb = mI_alloc_skb(hscx->bch.maxlen, GFP_ATOMIC); - if (!hscx->bch.rx_skb) { - pr_info("%s: B receive out of memory\n", - hscx->ip->name); - hscx_cmdr(hscx, 0x80); /* RMC */ - return; - } - } - if ((hscx->bch.rx_skb->len + count) > hscx->bch.maxlen) { - pr_debug("%s: overrun %d\n", hscx->ip->name, - hscx->bch.rx_skb->len + count); - skb_trim(hscx->bch.rx_skb, 0); + maxlen = bchannel_get_rxbuf(&hscx->bch, count); + if (maxlen < 0) { hscx_cmdr(hscx, 0x80); /* RMC */ + if (hscx->bch.rx_skb) + skb_trim(hscx->bch.rx_skb, 0); + pr_warning("%s.B%d: No bufferspace for %d bytes\n", + hscx->ip->name, hscx->bch.nr, count); return; } p = skb_put(hscx->bch.rx_skb, count); |