linux-kernel - Re: [Regression, post-2.6.35] ath9k occasionally drops out of PCI config space

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Date:	Tue, 9 Nov 2010 20:26:48 +0100
From:	"Rafael J. Wysocki" <rjw@...k.pl>
To:	"Luis R. Rodriguez" <lrodriguez@...eros.com>
Cc:	Luis Rodriguez <Luis.Rodriguez@...eros.com>,
	Felix Fietkau <nbd@...nwrt.org>,
	"John W. Linville" <linville@...driver.com>,
	"linux-wireless@...r.kernel.org" <linux-wireless@...r.kernel.org>,
	LKML <linux-kernel@...r.kernel.org>,
	"linux-pci@...r.kernel.org" <linux-pci@...r.kernel.org>
Subject: Re: [Regression, post-2.6.35] ath9k occasionally drops out of PCI config space

On Monday, November 08, 2010, Luis R. Rodriguez wrote:
> On Mon, Nov 8, 2010 at 12:47 PM, Rafael J. Wysocki <rjw@...k.pl> wrote:
> > On Friday, November 05, 2010, Luis R. Rodriguez wrote:
> >> On Fri, Nov 05, 2010 at 01:50:02PM -0700, Rafael J. Wysocki wrote:
> >> > Hi,
> >> >
> >> > For some time I've been experiencing a regression associated with ath9k
> >> > that occasionally it drops the connection with the AP and goes into a state
> >> > in which reading from its PCI config registers (as done by lspci) return all
> >> > ones.
> >> >
> >> > It may be sort of brought back to life by a suspend/resume afterwards, but
> >> > then the driver cannot really handle it and realoding the driver doesn't help
> >> > (probe fails).  Basically, full machine reboot is needed to revive the adapter.
> >> >
> >> > The device is:
> >> >
> >> > 09:00.0 Network controller: Atheros Communications Inc. AR928X Wireless Network Adapter (PCI-Express) (rev 01)
> >> >         Subsystem: Foxconn International, Inc. Device e01f
> >> >
> >> > and the kernel says:
> >> >
> >> > [    9.623217] ath9k 0000:09:00.0: PCI INT A -> GSI 19 (level, low) -> IRQ 19
> >> > [    9.631518] ath9k 0000:09:00.0: setting latency timer to 64
> >> > [   10.071497] ath: EEPROM regdomain: 0x65
> >> > [   10.071502] ath: EEPROM indicates we should expect a direct regpair map
> >> > [   10.071510] ath: Country alpha2 being used: 00
> >> > [   10.071514] ath: Regpair used: 0x65
> >> > [   10.096025] phy0: Selected rate control algorithm 'ath9k_rate_control'
> >> > [   10.097803] Registered led device: ath9k-phy0::radio
> >> > [   10.098035] Registered led device: ath9k-phy0::assoc
> >> > [   10.098249] Registered led device: ath9k-phy0::tx
> >> > [   10.098483] Registered led device: ath9k-phy0::rx
> >> > [   10.098496] phy0: Atheros AR9280 Rev:2 mem=0xffffc900017e0000, irq=19
> >> >
> >> > The issue is not really bisectable, because I'm unable to trigger it on demand
> >> > and it occurs approx. 1-2 times a day.  So, if you have any ideas what to test,
> >> > please let me know.
> >> >
> >> > It is not reproducible with the 2.6.35 kernel.
> >>
> >> Please try this patch.
> >
> > It _appears_ to help.  At least I haven't been able to reproduce the problem
> > since I applied it, which was on Saturday early in the morning.
> >
> > Still, I also haven't used wireless a lot since that time, because I've been
> > traveling mostly.
> 
> Thanks, please let us know when you are satisfied with this as a fix.

OK, I'm now quite confident that it really helps.

> Its going upstream so either way if you find you hit the issue just
> let us know.

Great, thanks, I will.

Rafael
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