Date:	Tue, 26 Feb 2008 17:47:45 +1100 (EST)
From:	Tim Connors <tconnors@...ro.swin.edu.au>
To:	Andrew Morton <akpm@...ux-foundation.org>
cc:	kernel list <linux-kernel@...r.kernel.org>,
	linux-wireless@...r.kernel.org
Subject: Re: iwl4965 dropping packets and __dev_addr_discard: address leakage!
 da_users=1

On Mon, 25 Feb 2008, Andrew Morton wrote:

> On Tue, 26 Feb 2008 16:22:43 +1100 Tim Connors <tconnors@...ro.swin.edu.au> wrote:
> 
> > Possibly because of the frequent renegotiating my iwl4965 card has
> > been making, it has now decided it's not going to pass packets
> > reliably until presumably next time I reboot.
> > 
> > I've noticed messages in syslog that I hadn't seen when things were
> > working fine.  The problem possibly has only surfaced after rmmodding
> > the iwl4965 module, then remodding it.  It stays with me through being
> > removed and modprobed again.  It is being bonded in conjunction with a
> > physical ethernet, if that is relevant, although I think I reproduced
> > it when it was on its lonesome.
> > 
> > 
> > Fresh after reboot:
> > 
> > Feb 22 09:49:31 dirac kernel: iwl4965: Intel(R) Wireless WiFi Link 4965AGN driver for Linux, 1.1.17kds
> > Feb 22 09:49:31 dirac kernel: iwl4965: Copyright(c) 2003-2007 Intel Corporation
> > Feb 22 09:49:31 dirac kernel: ACPI: PCI Interrupt 0000:0c:00.0[A] -> GSI 17 (level, low) -> IRQ 17
> > Feb 22 09:49:31 dirac kernel: PCI: Setting latency timer of device 0000:0c:00.0 to 64
> > Feb 22 09:49:31 dirac kernel: iwl4965: Detected Intel Wireless WiFi Link 4965AGN
> > Feb 22 09:49:31 dirac kernel: ACPI: PCI Interrupt 0000:00:1b.0[A] -> GSI 21 (level, low) -> IRQ 21
> > Feb 22 09:49:31 dirac kernel: PCI: Setting latency timer of device 0000:00:1b.0 to 64
> > Feb 22 09:49:31 dirac kernel: iwl4965: Tunable channels: 11 802.11bg, 13 802.11a channels
> > Feb 22 09:49:31 dirac kernel: phy0: Selected rate control algorithm 'iwl-4965-rs'
> > 
> > now finished with it, will be deconfigured and rmmodded:
> > 
> > Feb 23 03:05:23 dirac kernel: __dev_addr_discard: address leakage! da_users=1
> > Feb 23 03:05:23 dirac kernel: ACPI: PCI interrupt for device 0000:0c:00.0 disabled
> > 
> > The modprobed again:
> > 
> > Feb 23 03:05:35 dirac kernel: iwl4965: Intel(R) Wireless WiFi Link 4965AGN driver for Linux, 1.1.17kds
> > Feb 23 03:05:35 dirac kernel: iwl4965: Copyright(c) 2003-2007 Intel Corporation
> > Feb 23 03:05:35 dirac kernel: ACPI: PCI Interrupt 0000:0c:00.0[A] -> GSI 17 (level, low) -> IRQ 17
> > Feb 23 03:05:35 dirac kernel: PCI: Setting latency timer of device 0000:0c:00.0 to 64
> > Feb 23 03:05:35 dirac kernel: iwl4965: Detected Intel Wireless WiFi Link 4965AGN
> > Feb 23 03:05:35 dirac kernel: iwl4965: Tunable channels: 11 802.11bg, 13 802.11a channels
> > Feb 23 03:05:35 dirac kernel: phy9: Selected rate control algorithm 'iwl-4965-rs'
> > 
> > according to lspci -vvv, 0c:00.0 is:
> > 
> > 0c:00.0 Network controller: Intel Corporation PRO/Wireless 4965 AG or AGN Network Connection (rev 61)
> >         Subsystem: Intel Corporation Unknown device 1120
> >         Control: I/O- Mem+ BusMaster+ SpecCycle- MemWINV- VGASnoop- ParErr- Stepping- SERR+ FastB2B- DisINTx+
> >         Status: Cap+ 66MHz- UDF- FastB2B- ParErr- DEVSEL=fast >TAbort- <TAbort- <MAbort- >SERR- <PERR- INTx-
> >         Latency: 0, Cache Line Size: 64 bytes
> >         Interrupt: pin A routed to IRQ 379
> >         Region 0: Memory at f9ffe000 (64-bit, non-prefetchable) [size=8K]
> >         Capabilities: [c8] Power Management version 3
> >                 Flags: PMEClk- DSI+ D1- D2- AuxCurrent=0mA PME(D0+,D1-,D2-,D3hot+,D3cold+)
> >                 Status: D0 PME-Enable- DSel=0 DScale=0 PME-
> >         Capabilities: [d0] Message Signalled Interrupts: Mask- 64bit+ Queue=0/0 Enable+
> >                 Address: 00000000fee0300c  Data: 4194
> >         Capabilities: [e0] Express (v1) Endpoint, MSI 00
> >                 DevCap: MaxPayload 128 bytes, PhantFunc 0, Latency L0s <512ns, L1 unlimited
> >                         ExtTag- AttnBtn- AttnInd- PwrInd- RBE+ FLReset-
> >                 DevCtl: Report errors: Correctable- Non-Fatal- Fatal- Unsupported-
> >                         RlxdOrd+ ExtTag- PhantFunc- AuxPwr- NoSnoop+
> >                         MaxPayload 128 bytes, MaxReadReq 128 bytes
> >                 DevSta: CorrErr+ UncorrErr- FatalErr- UnsuppReq+ AuxPwr+ TransPend-
> >                 LnkCap: Port #0, Speed 2.5GT/s, Width x1, ASPM L0s L1, Latency L0 <128ns, L1 <64us
> >                         ClockPM+ Suprise- LLActRep- BwNot-
> >                 LnkCtl: ASPM L0s Enabled; RCB 64 bytes Disabled- Retrain- CommClk+
> >                         ExtSynch- ClockPM- AutWidDis- BWInt- AutBWInt-
> >                 LnkSta: Speed 2.5GT/s, Width x1, TrErr- Train- SlotClk+ DLActive- BWMgmt- ABWMgmt-
> >         Capabilities: [100] Advanced Error Reporting <?>
> >         Capabilities: [140] Device Serial Number d7-36-9b-ff-ff-e8-13-00
> >         Kernel driver in use: iwl4965
> >         Kernel modules: iwl4965
> 
> (cc linux-wireless)
> 
> What kernel version is this?
> 
> Is this a regression from an earlier kenrel version?  If so, which?

kernel 2.6.24
version 4.44.1.20 of the firmware.

The iwl4965 version is fairly ancient in mainline kernel: 1.1.17kds
Last time I looked, 1.2.24 was the latest version, but I never succeeded 
in getting it to work (or compile?) in 2.6.24.

Don't know whether it's a regression - I've only been excercising my 
wireless recently, although I'm sure I would have come across it before 
when I was using 2.6.23 (which also comes version 0.1.15kds of the iwl4965 
module, by the looks of it).  Haven't rebooted yet since this problem 
began, just in case this is just a temporary problem that needs debugging.

-- 
Tim Connors

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