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prevent excessively small buffer sizes resulting in hundreds of irqs per

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second
This commit is contained in:
Cameron Grant 2001-01-24 01:15:50 +00:00
parent 0d6d6aa373
commit 6e64c174bd
1 changed files with 14 additions and 12 deletions
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26
sys/dev/sound/pcm/channel.c
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@ -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;
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);
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;