>Number:         14559
>Category:       kern
>Synopsis:       wi driver lockups for 400ms when trying to update statistics
>Confidential:   no
>Severity:       serious
>Priority:       medium
>Responsible:    kern-bug-people
>State:          open
>Class:          sw-bug
>Submitter-Id:   net
>Arrival-Date:   Mon Nov 12 09:18:00 PST 2001
>Closed-Date:
>Last-Modified:
>Originator:     Patrik Andersin
>Release:        NetBSD 1.5Y
>Organization:
Portalify Ltd.
>Environment:
System: NetBSD cattop.portalify.fi 1.5Y NetBSD 1.5Y (CATTOP.cb2) #2: Fri Nov 9 13:21:55 EET 2001 root@cattop.portalify.fi:/usr/src/sys/arch/i386/compile/CATTOP.cb2 i386
Architecture: i386
Machine: i386
>Description:
Wi driver hangs for 400ms once a minute when it tries to update
statistics. This has been tested with Lucent Orinoco Silver card.

wi_inquire_stats() calls once minute:
	wi_cmd(sc, WI_CMD_INQUIRE, WI_INFO_COUNTERS);

wi_cmd() gets through CSR_WRITE_2() lines but the for loop
after those, where it tests for cmd completed bit, loops from 
0 to WI_TIMEOUT (65536).

>How-To-Repeat:
Just run ntpdate -b in a loop. You should notice when clock gets out of sync.

#!/bin/sh
while sleep 10
do
ntpdate -b time2.stupi.se
done

>Fix:
Workaround: Don't initialize statistics gathering.
In file sys/dev/ic/wi.c comment out callout_reset in wi_init():

#if 0
	callout_reset(&sc->wi_stats_ch, STATS_FREQUENCY, wi_inquire_stats, sc);
#endif
>Release-Note:
>Audit-Trail:
>Unformatted: