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

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Message-ID: <20131030140733.GH3521@intel.com>
Date:	Wed, 30 Oct 2013 16:07:33 +0200
From:	Mika Westerberg <mika.westerberg@...ux.intel.com>
To:	Alex Williamson <alex.williamson@...hat.com>
Cc:	linux-acpi@...r.kernel.org,
	"Rafael J. Wysocki" <rjw@...ysocki.net>,
	Bjorn Helgaas <bhelgaas@...gle.com>,
	Len Brown <lenb@...nel.org>, linux-pci@...r.kernel.org,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH] ACPI / hotplug / PCI: Always rescan the slot for new
 devices

On Wed, Oct 30, 2013 at 07:57:46AM -0600, 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@...ux.intel.com>
> > ---
> > 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,

Thanks!
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