Author: weongyo
Date: Mon Mar 1 23:51:13 2010
New Revision: 204542
URL: http://svn.freebsd.org/changeset/base/204542
Log:
calculates the integer square root if a positive integer X is larger
than 256 instead of using sqrt_table.
Reported by: Joe Marcus Clarke <marcus at freebsd dot org>
Modified:
head/sys/dev/bwn/if_bwn.c
Modified: head/sys/dev/bwn/if_bwn.c
==============================================================================
--- head/sys/dev/bwn/if_bwn.c Mon Mar 1 23:39:43 2010 (r204541)
+++ head/sys/dev/bwn/if_bwn.c Mon Mar 1 23:51:13 2010 (r204542)
@@ -12846,7 +12846,6 @@ bwn_phy_lp_clear_deaf(struct bwn_mac *ma
static unsigned int
bwn_sqrt(struct bwn_mac *mac, unsigned int x)
{
- struct bwn_softc *sc = mac->mac_sc;
/* Table holding (10 * sqrt(x)) for x between 1 and 256. */
static uint8_t sqrt_table[256] = {
10, 14, 17, 20, 22, 24, 26, 28,
@@ -12886,9 +12885,11 @@ bwn_sqrt(struct bwn_mac *mac, unsigned i
if (x == 0)
return (0);
if (x >= 256) {
- device_printf(sc->sc_dev,
- "out of bounds of the square-root table (%d)\n", x);
- return (16);
+ unsigned int tmp;
+
+ for (tmp = 0; x >= (2 * tmp) + 1; x -= (2 * tmp++) + 1)
+ /* do nothing */ ;
+ return (tmp);
}
return (sqrt_table[x - 1] / 10);
}
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