Re: [PATCH] ACPI / hotplug / PCI: Always rescan the slot for new devices

From: Rafael J. Wysocki
Date: Wed Oct 30 2013 - 10:01:15 EST


On Wednesday, October 30, 2013 07:57:46 AM Alex Williamson wrote:
> On Wed, 2013-10-30 at 14:40 +0200, Mika Westerberg wrote:
> > Commit 2dc4128 (ACPI / hotplug / PCI: Avoid doing too much for spurious
> > notifies) changed the enable_slot() to check return value of pci_scan_slot()
> > and if it is zero return early from the function. It means that there were
> > no new devices in this particular slot.
> >
> > However, if a device appeared deeper in the hierarchy the code now ignores
> > it causing things like Thunderbolt chaining fail to recognize new devices.
> >
> > The problem with Alex Williamson's machine was solved with commit
> > a47d8c8 (ACPI / hotplug / PCI: Avoid parent bus rescans on spurious device
> > checks) and hence we should be able to restore the original functionality
> > that we always rescan on bus check notification.
> >
> > On a device check notification we still check what acpiphp_rescan_slot()
> > returns and on zero bail out early.
> >
> > Signed-off-by: Mika Westerberg <mika.westerberg@xxxxxxxxxxxxxxx>
> > ---
> > Alex,
> >
> > Are you able to check if your machine still works and doesn't slow down
> > during boot after this patch is applied?
>
> Looks ok to me, no new console output or boot delay. Thanks,

Great, thanks!

May I add your Tested-by to it, then?

Rafael

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