linux-kernel - Re: [PATCH v2 0/13] ACPI / hotplug / PCI: Updates on top of changes merged recently

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Date:	Mon, 3 Feb 2014 12:44:08 +0200
From:	Mika Westerberg <mika.westerberg@...ux.intel.com>
To:	"Rafael J. Wysocki" <rjw@...ysocki.net>
Cc:	ACPI Devel Maling List <linux-acpi@...r.kernel.org>,
	Bjorn Helgaas <bhelgaas@...gle.com>,
	Aaron Lu <aaron.lu@...el.com>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
	Linux PCI <linux-pci@...r.kernel.org>
Subject: Re: [PATCH v2 0/13] ACPI / hotplug / PCI: Updates on top of changes
 merged recently

On Sun, Feb 02, 2014 at 01:19:33AM +0100, Rafael J. Wysocki wrote:
> On Monday, January 27, 2014 01:37:17 AM Rafael J. Wysocki wrote:
> > Hi All,
> > 
> > ACPIPHP can be simplified a bit on top of some PCI and ACPI changes merged
> > recently and the following series of patches implements those simplifications:
> > 
> > [1/11] Fix up two kerneldoc comments in acpiphp_glue.c.
> > [2/11] Get rid of an unnecessary label in register_slot().
> > [3/11] Drop acpiphp_bus_trim() and use acpi_bus_trim() instead of it directly.
> > [4/11] Move the acpi_bus_get_device() call out of acpiphp_no_hotplug().
> > [5/11] Store struct acpi_device pointers instead of ACPI handles in struct acpiphp_context.
> > [6/11] Drop acpiphp_bus_add() (which has only one user).
> > [7/11] Drop crit_sect mutexes (that are redundant).
> > [8/11] Clean up the usage of the slot variable in hotplug_event().
> > [9/11] Drop dev_in_slot() and rework disable_slot() to walk bus->devices directly.
> > [10/11] Use acpi_handle_debug() in hotplug_event() instead of open-coded stuff.
> > [11/11] Drop handle argument from the member functions of struct acpi_dock_ops.
> > 
> > All of that is relateively straightforward, but I have some more intrusive changes
> > on top of it in the works.  They will be posted separately later this week.
> 
> I've learned a couple of things since I sent this patchset.  First, all
> bus->devices list walks that may remove PCI devices should be done in reverse
> order or they can crash if virtual functions are involved.  Second, hotplug_event()
> (in acpiphp_glue.c) has to acquire pci_rescan_remove_lock by itself, because it
> may be called from multiple places and all of them need that lock to be held.
> That is done by patches [1-2/13] which I'm planning to push as fixes for 3.14-rc2.
> 
> The rest is pretty much the same as last time except that the old patch [9/11]
> became [3/13] in this series and it has been changed so that the list is walked in
> reverse order.

On Intel NUC and DZ77RE-75K,

Tested-by: Mika Westerberg <mika.westerberg@...ux.intel.com>
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