LOR in iwi with new 802.11 work

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LOR in iwi with new 802.11 work
\ Stefan Ehmann (14 Jun 2007)
. \ Sam Leffler (14 Jun 2007)
. . \ Stefan Ehmann (15 Jun 2007)
. . . \ Andrew Thompson (15 Jun 2007)
. . . . \ Stefan Ehmann (15 Jun 2007)
. . . \ Sam Leffler (15 Jun 2007)
. . . . \ Stefan Ehmann (16 Jun 2007)
. . . . . \ Sam Leffler (16 Jun 2007)
. . . . . \ Jeremie Le Hen (22 Jun 2007)

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Subject:	LOR in iwi with new 802.11 work
Group:	Freebsd-current
From:	Stefan Ehmann
Date:	14 Jun 2007

After the system is up for about 5 minutes, I see this LOR. Haven't seen it
posted yet.

Stefan

lock order reversal:
1st 0xc2e4700c ieee80211com (802.11 com lock)
@ /usr/src/sys/net80211/ieee80211_scan.c:523
2nd 0xc2e48400 iwi0 (network driver)
@ /usr/src/sys/modules/iwi/../../dev/iwi/if_iwi.c:1908
KDB: stack backtrace:
db_trace_self_wrapper(c0a39fdb,d2ce68f0,c077bb0e,c0a3c481,c2e48400,...) at
db_trace_self_wrapper+0x26
kdb_backtrace(c0a3c481,c2e48400,c2e360f0,c0cc6a0c,c0cc650a,...) at
kdb_backtrace+0x29
witness_checkorder(c2e48400,9,c0cc650a,774,80246,...) at
witness_checkorder+0x6de
_mtx_lock_flags(c2e48400,0,c0cc650a,774,c0a55e6d,...) at _mtx_lock_flags+0xbc
iwi_start(c2e38000,cf,c2fb8600,c2e47004) at iwi_start+0xae
if_start(c2e38000,0,c0a4702d,17e,d2ce6a1c,...) at if_start+0x89
ieee80211_send_nulldata(c3396000,38,c0a3bb59,6cc,c2e4700c) at
ieee80211_send_nulldata+0x1f4
ieee80211_sta_pwrsave(c2e47004,1,20b,360,c2e3d000,...) at
ieee80211_sta_pwrsave+0x212
scan_restart(c2e3d000,c2e47004,c0a47b0e,20b,450,...) at scan_restart+0x96
ieee80211_bg_scan(c2e47004,c2ea3034,8,f5,c0b8e1a0,...) at
ieee80211_bg_scan+0x102
ieee80211_recv_mgmt(c2e47004,c2e60e00,c3396000,80,4b,...) at
ieee80211_recv_mgmt+0xdaf
ieee80211_input(c2e47004,c2e60e00,c3396000,4b,0,...) at ieee80211_input+0x142b
iwi_intr(c2e47000,0,c0a3421e,471,c2c0a0e4,...) at iwi_intr+0x541
ithread_loop(c2ceb940,d2ce6d38,c0a33f92,316,c2c3c804,...) at
ithread_loop+0x1b5
fork_exit(c0729ea0,c2ceb940,d2ce6d38) at fork_exit+0xb8
fork_trampoline() at fork_trampoline+0x8
--- trap 0, eip = 0, esp = 0xd2ce6d70, ebp = 0 ---
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