linux-kernel - [PATCH 34/40] ACPI, PCI: Notify acpi_pci_drivers when hot-plugging PCI root bridges

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Date:	Wed, 19 Sep 2012 11:54:48 -0700
From:	Yinghai Lu <yinghai@...nel.org>
To:	Bjorn Helgaas <bhelgaas@...gle.com>, Len Brown <lenb@...nel.org>,
	Taku Izumi <izumi.taku@...fujitsu.com>,
	Jiang Liu <jiang.liu@...wei.com>, x86 <x86@...nel.org>
Cc:	Andrew Morton <akpm@...ux-foundation.org>,
	Linus Torvalds <torvalds@...ux-foundation.org>,
	Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
	linux-pci@...r.kernel.org, linux-kernel@...r.kernel.org,
	linux-acpi@...r.kernel.org, Yinghai Lu <yinghai@...nel.org>
Subject: [PATCH 34/40] ACPI, PCI: Notify acpi_pci_drivers when hot-plugging PCI root bridges

From: Jiang Liu <jiang.liu@...wei.com>

When hot-plugging PCI root bridge, acpi_pci_drivers' add()/remove()
methods should be invoked to notify registered drivers.

-v2: Move add calling to acpi_pci_root_start - Yinghai
-v3: use acpi_pci_root pointer instead of handle - Yinghai
-v3: Fold stop ioapic/iommu drivers after pci devices change in. - Yinghai

Signed-off-by: Jiang Liu <jiang.liu@...wei.com>
Signed-off-by: Yinghai Lu <yinghai@...nel.org>
---
 drivers/acpi/pci_root.c |   11 +++++++++++
 1 files changed, 11 insertions(+), 0 deletions(-)

diff --git a/drivers/acpi/pci_root.c b/drivers/acpi/pci_root.c
index 325cf5c..0ea5ad0 100644
--- a/drivers/acpi/pci_root.c
+++ b/drivers/acpi/pci_root.c
@@ -633,6 +633,11 @@ end:
 static int acpi_pci_root_start(struct acpi_device *device)
 {
 	struct acpi_pci_root *root = acpi_driver_data(device);
+	struct acpi_pci_driver *driver;
+
+	list_for_each_entry(driver, &acpi_pci_drivers, node)
+		if (driver->add)
+			driver->add(root);
 
 	pci_bus_add_devices(root->bus);
 	return 0;
@@ -643,6 +648,7 @@ static int acpi_pci_root_remove(struct acpi_device *device, int type)
 	acpi_status status;
 	acpi_handle handle;
 	struct acpi_pci_root *root = acpi_driver_data(device);
+	struct acpi_pci_driver *driver;
 
 	/* that root bus could be removed already */
 	if (!pci_find_bus(root->segment, root->secondary.start)) {
@@ -651,8 +657,13 @@ static int acpi_pci_root_remove(struct acpi_device *device, int type)
 		goto out;
 	}
 
+	/* stop normal pci drivers before we stop ioapic and dmar etc */
 	pci_stop_root_bus(root->bus);
 
+	list_for_each_entry_reverse(driver, &acpi_pci_drivers, node)
+		if (driver->remove)
+			driver->remove(root);
+
 	device_set_run_wake(root->bus->bridge, false);
 	pci_acpi_remove_bus_pm_notifier(device);
 
-- 
1.7.7

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