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    SubjectRe: ohci1394 problem (MMIO broken) (was 2.6.25-rc6-git6: Reported regressions from 2.6.24)
    Stefan Richter schrieb:
    > Rafael J. Wysocki wrote:
    >> Bug-Entry : http://bugzilla.kernel.org/show_bug.cgi?id=10080
    >> Subject : 2.6.25-rc2: ohci1394 problem (MMIO broken)
    >> Submitter : Thomas Meyer <thomas@m3y3r.de>
    >> Date : 2008-02-20 08:47 (31 days old)
    >> References : http://lkml.org/lkml/2008/2/20/58
    >> Handled-By : Stefan Richter <stefanr@s5r6.in-berlin.de>
    >
    > This bug is alas an orphan. It is /not/ handled by me, because it is
    > not an IEEE 1394 subsystem bug and I have no idea what to do about it.
    >
    > Note the following:
    >
    > - Several or all of ohci1394's MMIO reads return ~0 (all bits set
    > to one) --- or 0 --- where different values are expected.
    >
    > - In http://lkml.org/lkml/2008/2/23/244 we get to see a
    > WARNING: at arch/x86/mm/ioremap.c:137 __ioremap+0xa7/0x16a()
    > which is "WARN_ON_ONCE(page_is_ram(pfn));".
    > After that, the failures start.
    > But before that, "Unknown symbol" messages pop up when ohci1394
    > is loaded. These symbols are implemented by ieee1394 on which
    > ohci1394 depends.
    >
    > More context from http://lkml.org/lkml/2008/2/23/244:
    >
    >> [ 199.908169] ath_pci: wifi0: Atheros 5424/2424: mem=0x94300000, irq=17
    >
    > ath_hal taints the kernel.
    I removed the ath driver, see bug
    http://bugzilla.kernel.org/show_bug.cgi?id=10080.
    >
    >> [ 847.318678] ohci1394: Unknown symbol hpsb_iso_wake
    >> [ 847.318791] ohci1394: Unknown symbol hpsb_resume_host
    > ...
    >
    > Some unexplained build problem.
    I moved ohci1394.ko + ieee1394.ko file manually to avoid automatic
    loading. then i used insmod on those files and forgot to insmod ieee1394
    first. That's all. This is not related to the bug.
    >
    >> [ 856.789954] ACPI: PCI Interrupt 0000:0c:03.0[A] -> GSI 19 (level,
    >> low) -> IRQ 19
    >> [ 856.790040] ------------[ cut here ]------------
    >> [ 856.790044] WARNING: at arch/x86/mm/ioremap.c:137
    >> __ioremap+0xa7/0x16a()
    >> [ 856.790048] Modules linked in: ohci1394(+) ieee1394 wlan_wep
    >> wlan_scan_sta ath_rate_sample ath_pci wlan ath_hal(P) firmware_class
    >> fuse snd_seq snd_seq_device nls_iso8859_15 nls_cp850 vfat fat usbhid
    >> appletouch applesmc input_polldev led_class dummy binfmt_misc tun
    >> pktcdvd loop msr cpuid coretemp hwmon eeprom cpufreq_powersave
    >> cpufreq_conservative acpi_cpufreq thermal ehci_hcd tpm_infineon
    >> i2c_i801 i2c_core tpm uhci_hcd usbcore tpm_bios processor ac battery
    >> sr_mod rng_core iTCO_wdt button firewire_ohci firewire_core sg
    >> snd_hda_intel snd_pcm snd_timer snd soundcore snd_page_alloc evdev
    >> intel_agp cdrom [last unloaded: microcode]
    >> [ 856.790119] Pid: 7140, comm: insmod Tainted: P 2.6.25-rc2
    >> #115
    >> [ 856.790125] [<c011e5ab>] warn_on_slowpath+0x40/0x4f
    >> [ 856.790143] [<c0118045>] __wake_up+0x29/0x39
    >> [ 856.790154] [<c0277305>] netlink_broadcast+0x26e/0x2af
    >> [ 856.790169] [<c01cc36b>] kobject_uevent_env+0x33d/0x361
    >> [ 856.790178] [<c025ef2b>] pci_mmcfg_write+0xc4/0xd5
    >> [ 856.790187] [<c0260157>] raw_pci_write+0x3e/0x46
    >> [ 856.790200] [<c01148f8>] __ioremap+0xa7/0x16a
    >> [ 856.790210] [<f8b14425>] ohci1394_pci_probe+0x20c/0x5a6 [ohci1394]
    >> [ 856.790226] [<c01d63f1>] pci_device_probe+0x36/0x55
    >> [ 856.790236] [<c02226cb>] driver_probe_device+0x9d/0x114
    > ...
    >> [ 856.790598] ---[ end trace 5b0384c17c339107 ]---
    >> [ 856.943807] ohci1394: fw-host0: Get PHY Reg timeout
    >> [0x00008400/0x00000000/100]
    >
    > MMIO read expected 0x00008400, got 0x00000000.
    >
    > ...
    >> [ 921.826439] ohci1394: fw-host0: Unhandled interrupt(s) 0xfc7cfe0c
    >
    > MMIO read got random bits in the interrupt event register.
    >
    > ...
    >> [ 994.471724] ohci1394: fw-host0: OHCI-1394 0.35 (PCI): IRQ=[19]
    >> MMIO=[100000000-1000007ff] Max Packet=[65536] IR/IT contexts=[32/32]
    >
    > The values for Max Packet and IR/IT contexts came from bogus MMIO reads.
    >
    > Thomas, you wrote in http://lkml.org/lkml/2008/3/17/316 that the
    > problem resurfaced.
    > - Are the "Unknown symbol"s still there? These are not supposed to
    > happen.
    No. (See explanation above).
    > - Is the "WARNING: at arch/x86/mm/ioremap.c" still there?
    No. I couldn't reproduce this warning, yet.

    > - Can you reproduce it without the atheros driver?
    Yes.

    See http://bugzilla.kernel.org/show_bug.cgi?id=10080.

    >
    > Rafael, no matter how it looks, this is not "handled-by: me". :-)
    > I don't know nothing about kbuild nor about arch/x86/mm nor about WLAN.
    > The IEEE 1394 bits in the bug of which I know something about are
    > purely accidental.
    Seems so.




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