On Sunday 15 March 2009, Nick Kossifidis wrote:
> * Add tx power calibration support
> * Add a few tx power limits
> * Hardcode default power to 12.5dB
> * Disable TPC for now
>
> v2: Address Jiri's comments
>
> Signed-off-by: Nick Kossifidis <mickflemm@xxxxxxxxx>
After bisecting I have found that this patch causes a regression with my
wireless PCI board:
0:0b.0 Ethernet controller: 3Com Corporation AR5212 802.11abg NIC (3CRDAG675)
(rev 01)
Subsystem: 3Com Corporation 3CRDAG675 11a/b/g Wireless PCI Adapter
Control: I/O- Mem+ BusMaster+ SpecCycle- MemWINV+ VGASnoop- ParErr-
Stepping- SERR- FastB2B- DisINTx-
Status: Cap+ 66MHz- UDF- FastB2B+ ParErr- DEVSEL=medium >TAbort-
<TAbort- <MAbort- >SERR- <PERR- INTx-
Latency: 168 (2500ns min, 7000ns max), Cache Line Size: 32 bytes
Interrupt: pin A routed to IRQ 10
Region 0: Memory at d6800000 (32-bit, non-prefetchable) [size=64K]
Capabilities: [44] Power Management version 2
Flags: PMEClk- DSI- D1- D2- AuxCurrent=0mA
PME(D0-,D1-,D2-,D3hot-,D3cold-)
Status: D0 PME-Enable- DSel=0 DScale=2 PME-
Kernel driver in use: ath5k
Kernel modules: ath5k
Before applying the patch I can associate with my access point without
problems. After giving the "iwconfig essid" command I can see the frequency
sweep in the .11G and .11A bands until the authentication-association
process ends successfully. I get the following diagnostic from dmesg:
Mar 29 11:29:50 kernel: ath5k 0000:00:0b.0: enabling device (0014 -> 0016)
Mar 29 11:29:50 kernel: ath5k 0000:00:0b.0: PCI INT A -> Link[LNKB] -> GSI 10
(level, low) -> IRQ 10
Mar 29 11:29:50 kernel: ath5k 0000:00:0b.0: registered as 'phy0'
Mar 29 11:29:50 kernel: phy0: Selected rate control algorithm 'minstrel'
Mar 29 11:29:50 kernel: ath5k phy0: Atheros AR5212 chip found (MAC: 0x56, PHY:
0x41)
Mar 29 11:29:50 kernel: ath5k phy0: RF5112B multiband radio found (0x36)
Mar 29 11:29:50 kernel: udev: renamed network interface wlan0 to ath0
Mar 29 11:31:29 kernel: ath0: authenticate with AP 00:0c:f6:xx:xx:xx
Mar 29 11:31:29 kernel: ath0: authenticated
Mar 29 11:31:29 kernel: ath0: associate with AP 00:0c:f6:xx:xx:xx
Mar 29 11:31:29 kernel: ath0: RX AssocResp from 00:0c:f6:xx:xx:xx (capab=0x411
status=0 aid=2)
Mar 29 11:31:29 kernel: ath0: associated
Mar 29 11:31:29 kernel: phy0: Allocated STA 00:0c:f6:xx:xx:xx
Mar 29 11:31:29 kernel: phy0: Inserted STA 00:0c:f6:xx:xx:xx
Mar 29 11:31:29 kernel: ath0: switched to short slot time
(BSSID=00:0c:f6:xx:xx:xx)
and with "modprobe -r ath5k"
Mar 29 11:32:23 kernel: ath0: deauthenticating by local choice (reason=3)
Mar 29 11:32:23 kernel: phy0: Removed STA 00:0c:f6:xx:xx:xx
Mar 29 11:32:23 kernel: phy0: Destroyed STA 00:0c:f6:xx:xx:xx
Mar 29 11:32:23 kernel: ath5k 0000:00:0b.0: PCI INT A disabled
With the problematic patch there is no frequency sweep after the "iwconfig
essid" command and I can't associate anymore (the frequency remains stuck to
5.18GHz but I work with 802.11G)
Mar 29 11:08:45 kernel: cfg80211: Calling CRDA to update world regulatory
domain
Mar 29 11:08:45 kernel: ath5k 0000:00:0b.0: PCI INT A -> Link[LNKB] -> GSI 10
(level, low) -> IRQ 10
Mar 29 11:08:45 kernel: ath5k 0000:00:0b.0: registered as 'phy0'
Mar 29 11:08:45 kernel: phy0: Selected rate control algorithm 'minstrel'
Mar 29 11:08:45 kernel: ath5k phy0: Atheros AR5212 chip found (MAC: 0x56, PHY:
0x41)
Mar 29 11:08:45 kernel: ath5k phy0: RF5112B multiband radio found (0x36)
Mar 29 11:08:45 kernel: udev: renamed network interface wlan0 to ath0
Mar 29 11:09:03 kernel: ath5k phy0: noise floor calibration timeout (5180MHz)
Mar 29 11:09:36 last message repeated 3 times
Mar 29 11:10:43 last message repeated 6 times
Mar 29 11:11:48 last message repeated 6 times
Mar 29 11:12:54 last message repeated 6 times
Mar 29 11:14:00 last message repeated 6 times
Mar 29 11:15:06 last message repeated 6 times
Mar 29 11:16:12 last message repeated 6 times
and with "modprobe -r ath5k"
Mar 29 11:23:59 kernel: ath0: deauthenticating by local choice (reason=3)
Mar 29 11:24:05 kernel: ath5k phy0: noise floor calibration timeout (5180MHz)
Mar 29 11:24:38 last message repeated 3 times
Mar 29 11:24:49 kernel: ath5k phy0: noise floor calibration timeout (5180MHz)
(I can't understand the deauthenticating line when before I don't see an
authenticate line). At this point it's impossible to remove the module and
the execution of a top session identifies a "phy0" program which runs forever
with high CPU usage (I need to reboot the system)
PID USER PR NI VIRT RES SHR S %CPU %MEM TIME+ COMMAND
21548 root 15 -5 0 0 0 R 68.5 0.0 2:25.68 phy0
Fabio
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