On Fri, Nov 21, 2014 at 11:24:27AM -0700, Alex Williamson wrote:
> Reports against the TL-WDN4800 card indicate that PCI bus reset of
> this Atheros device cause system lock-ups and resets. I've also
> been able to confirm this behavior on multiple systems. The device
> never returns from reset and attempts to access config space of the
> device after reset result in hangs. Blacklist bus reset for the
> device to avoid this issue.
>
> Reported-by: Andreas Hartmann <andihartmann@xxxxxxxxxx>
> Signed-off-by: Alex Williamson <alex.williamson@xxxxxxxxxx>
> Tested-by: Andreas Hartmann <andihartmann@xxxxxxxxxx>
If I understand correctly, these two (patches 3 & 4) fix a v3.14 regression
caused by 425c1b223dac ("PCI: Add Virtual Channel to save/restore support").
If so, these should go to for-linus for v3.19. What about patches 1 & 2?
Do they fix a regression? Is there a pointer to a bugzilla or problem
report about that issue?
I don't understand the connection between 425c1b223dac and
PCI_DEV_FLAGS_NO_BUS_RESET, because 425c1b223dac doesn't seem to do any
resets. Is that the wrong commit, or can you outline the connection for
me?
Bjorn
> ---
>
> drivers/pci/quirks.c | 14 ++++++++++++++
> 1 file changed, 14 insertions(+)
>
> diff --git a/drivers/pci/quirks.c b/drivers/pci/quirks.c
> index 561e10d..ebbd5b4 100644
> --- a/drivers/pci/quirks.c
> +++ b/drivers/pci/quirks.c
> @@ -3029,6 +3029,20 @@ static void quirk_no_pm_reset(struct pci_dev *dev)
> DECLARE_PCI_FIXUP_CLASS_HEADER(PCI_VENDOR_ID_ATI, PCI_ANY_ID,
> PCI_CLASS_DISPLAY_VGA, 8, quirk_no_pm_reset);
>
> +static void quirk_no_bus_reset(struct pci_dev *dev)
> +{
> + dev->dev_flags |= PCI_DEV_FLAGS_NO_BUS_RESET;
> +}
> +
> +/*
> + * Atheros AR93xx chips do not behave after a bus reset. The device will
> + * throw a Link Down error on AER capable system and regardless of AER,
> + * config space of the device is never accessible again and typically
> + * causes the system to hang or reset when access is attempted.
> + * http://www.spinics.net/lists/linux-pci/msg34797.html
> + */
> +DECLARE_PCI_FIXUP_HEADER(PCI_VENDOR_ID_ATHEROS, 0x0030, quirk_no_bus_reset);
> +
> #ifdef CONFIG_ACPI
> /*
> * Apple: Shutdown Cactus Ridge Thunderbolt controller.
>
--
To unsubscribe from this list: send the line "unsubscribe linux-pci" in
the body of a message to majordomo@xxxxxxxxxxxxxxx
More majordomo info at http://vger.kernel.org/majordomo-info.html
