diff options
| author | cg <cg@FreeBSD.org> | 2001-01-24 01:15:50 +0000 |
|---|---|---|
| committer | cg <cg@FreeBSD.org> | 2001-01-24 01:15:50 +0000 |
| commit | 2cc907a0c75b3a8e08c1f544e6012dbdf1caf5d9 (patch) | |
| tree | 817cceca2616ab9dfe5b92efadfbb38d6d6febe6 /sys/dev/sound/pcm/channel.c | |
| parent | fa0d2b97b0799d27897da985f1129e635785cd1e (diff) | |
| download | FreeBSD-src-2cc907a0c75b3a8e08c1f544e6012dbdf1caf5d9.zip FreeBSD-src-2cc907a0c75b3a8e08c1f544e6012dbdf1caf5d9.tar.gz | |
prevent excessively small buffer sizes resulting in hundreds of irqs per
second
Diffstat (limited to 'sys/dev/sound/pcm/channel.c')
| -rw-r--r-- | sys/dev/sound/pcm/channel.c | 28 |
1 files changed, 15 insertions, 13 deletions
diff --git a/sys/dev/sound/pcm/channel.c b/sys/dev/sound/pcm/channel.c index 36a1e72..f11ac07 100644 --- a/sys/dev/sound/pcm/channel.c +++ b/sys/dev/sound/pcm/channel.c @@ -1211,17 +1211,20 @@ chn_setblocksize(pcm_channel *c, int blkcnt, int blksz) if (blksz == 0 || blksz == -1) { if (blksz == -1) c->flags &= ~CHN_F_HAS_SIZE; - if (c->flags & CHN_F_HAS_SIZE) - return 0; - blksz = (bs->bps * bs->spd) / CHN_DEFAULT_HZ; - tmp = 32; - while (tmp <= blksz) - tmp <<= 1; - tmp >>= 1; - blksz = tmp; - - RANGE(blksz, 16, CHN_2NDBUFMAXSIZE / 2); - RANGE(blkcnt, 2, CHN_2NDBUFMAXSIZE / blksz); + if (!(c->flags & CHN_F_HAS_SIZE)) { + blksz = (bs->bps * bs->spd) / CHN_DEFAULT_HZ; + tmp = 32; + while (tmp <= blksz) + tmp <<= 1; + tmp >>= 1; + blksz = tmp; + + RANGE(blksz, 16, CHN_2NDBUFMAXSIZE / 2); + RANGE(blkcnt, 2, CHN_2NDBUFMAXSIZE / blksz); + } else { + blksz = bs->blksz; + blkcnt = bs->blkcnt; + } } else { if ((blksz < 16) || (blkcnt < 2) || (blkcnt * blksz > CHN_2NDBUFMAXSIZE)) return EINVAL; @@ -1247,8 +1250,7 @@ chn_setblocksize(pcm_channel *c, int blkcnt, int blksz) /* adjust for different hw format/speed */ irqhz = (bs->bps * bs->spd) / bs->blksz; - if (irqhz < 16) - irqhz = 16; + RANGE(irqhz, 16, 512); b->blksz = (b->bps * b->spd) / irqhz; |
