From: "Rafael J. Wysocki" <rjw@sisk.pl>
To: "Maciej Rutecki" <maciej.rutecki@gmail.com>
Subject: Re: [2.6.26.*] boot problem (ahci/irq related?)
Date: Tue, 12 Aug 2008 16:45:35 +0200
User-Agent: KMail/1.9.6 (enterprise 20070904.708012)
Cc: "Alan Cox" <alan@lxorguk.ukuu.org.uk>,
       "Yinghai Lu" <yhlu.kernel@gmail.com>, "Ingo Molnar" <mingo@elte.hu>,
       "Linux Kernel Mailing List" <linux-kernel@vger.kernel.org>,
       linux-ide@vger.kernel.org, "Jeff Garzik" <jgarzik@pobox.com>,
       tj@kernel.org, andi@firstfloor.org,
       "Thomas Gleixner" <tglx@linutronix.de>,
       "H. Peter Anvin" <hpa@zytor.com>,
       "Jesse Barnes" <jbarnes@virtuousgeek.org>
References: <8db1092f0808111312x3baf819bxbb05030c05693065@mail.gmail.com> <20080812081632.303de380@lxorguk.ukuu.org.uk> <8db1092f0808120107k1f8a65f4sf406fa3a89125870@mail.gmail.com>
In-Reply-To: <8db1092f0808120107k1f8a65f4sf406fa3a89125870@mail.gmail.com>
MIME-Version: 1.0
Content-Type: text/plain;
  charset="utf-8"
Content-Transfer-Encoding: 7bit
Content-Disposition: inline
Message-Id: <200808121645.37539.rjw@sisk.pl>
Sender: linux-kernel-owner@vger.kernel.org
Content-Length: 1423
Lines: 39

On Tuesday, 12 of August 2008, Maciej Rutecki wrote:
> 2008/8/12 Alan Cox <alan@lxorguk.ukuu.org.uk>:
> >> > +sr 4:0:0:0: Attached scsi CD-ROM sr0
> >>
> >> looks like you are using ata driver for pata device instead of ide driver.
> >>
> >> so could be caused by bug in ata_piix...
> >
> > See the original bug report - he tried both and got the same kind of
> > behaviour.
> >
> >
> 
> Yes I have similar behaviour, very often kernel stops on this message:
> http://unixy.pl/maciek/download/kernel/dupa/2.6.26.2_config_ide/img_0001.jpg

In both cases one of the last messages is

ACPI: PCI Interrupt 0000:00:1f.2[B] -> GSI 17 (level, low) -> IRQ 17

and that comes from AHCI,  or rather from pci_enable_device() invoked by
AHCI.  Then, there are no more messages from AHCI, although there should
be at least 

ahci 0000:00:1f.2: AHCI 0001.0100 32 slots 4 ports 1.5 Gbps 0x1 impl SATA mode
ahci 0000:00:1f.2: flags: 64bit ncq ilck stag pm led clo pmp pio slum part 
PCI: Setting latency timer of device 0000:00:1f.2 to 64

So, it seems like the enabling of AHCI interrupt causes the failure and since
that's not 100% reproducible, it indicates a timing issue.

Thanks,
Rafael

--
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@vger.kernel.org
More majordomo info at  http://vger.kernel.org/majordomo-info.html
Please read the FAQ at  http://www.tux.org/lkml/