linux-kernel - [RFC PATCH 01/14] ACPI, PCI: Stop pci devices before acpi_pci

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Date:	Mon,  2 Apr 2012 19:19:28 -0700
From:	Yinghai Lu <yinghai@...nel.org>
To:	Bjorn Helgaas <bhelgaas@...gle.com>,
	Len Brown <len.brown@...el.com>,
	Jiang Liu <jiang.liu@...wei.com>,
	Suresh Siddha <suresh.b.siddha@...el.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,
	Yinghai Lu <yinghai@...nel.org>
Subject: [RFC PATCH 01/14] ACPI, PCI: Stop pci devices before acpi_pci_driver remove calling

During stop pci drivers, it still need to access ioapic and iommu.
So need to make sure those drivers need to be stop at first.

Also change the acpi_pci_drivers remove calling sequence to reverse.

Signed-off-by: Yinghai Lu <yinghai@...nel.org>
---
 drivers/acpi/pci_root.c |   11 +++++++----
 drivers/pci/remove.c    |    2 +-
 include/linux/pci.h     |    1 +
 3 files changed, 9 insertions(+), 5 deletions(-)

diff --git a/drivers/acpi/pci_root.c b/drivers/acpi/pci_root.c
index 4a7d575..ce662ae 100644
--- a/drivers/acpi/pci_root.c
+++ b/drivers/acpi/pci_root.c
@@ -657,10 +657,6 @@ static int acpi_pci_root_remove(struct acpi_device *device, int type)
 
 	mutex_lock(&acpi_pci_root_lock);
 
-	list_for_each_entry(driver, &acpi_pci_drivers, node)
-		if (driver->remove)
-			driver->remove(root->device->handle);
-
 	/* that root bus could be removed already */
 	if (!pci_find_bus(root->segment, root->secondary.start)) {
 		dev_printk(KERN_DEBUG, &device->dev,
@@ -668,6 +664,13 @@ 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_bus_devices(root->bus);
+
+	list_for_each_entry_reverse(driver, &acpi_pci_drivers, node)
+		if (driver->remove)
+			driver->remove(root->device->handle);
+
 	device_set_run_wake(root->bus->bridge, false);
 	pci_acpi_remove_bus_pm_notifier(device);
 
diff --git a/drivers/pci/remove.c b/drivers/pci/remove.c
index 18efb31..f672731 100644
--- a/drivers/pci/remove.c
+++ b/drivers/pci/remove.c
@@ -118,7 +118,7 @@ static void __pci_remove_bus_devices(struct pci_bus *bus)
 		__pci_remove_bus_device(dev);
 }
 
-static void pci_stop_bus_devices(struct pci_bus *bus)
+void pci_stop_bus_devices(struct pci_bus *bus)
 {
 	struct pci_dev *dev, *tmp;
 
diff --git a/include/linux/pci.h b/include/linux/pci.h
index 8199563..944f49e 100644
--- a/include/linux/pci.h
+++ b/include/linux/pci.h
@@ -706,6 +706,7 @@ extern void pci_dev_put(struct pci_dev *dev);
 extern void pci_remove_bus(struct pci_bus *b);
 extern void __pci_remove_bus_device(struct pci_dev *dev);
 extern void pci_stop_and_remove_bus_device(struct pci_dev *dev);
+void pci_stop_bus_devices(struct pci_bus *bus);
 void pci_stop_and_remove_bus(struct pci_bus *bus);
 extern void pci_stop_bus_device(struct pci_dev *dev);
 void pci_setup_cardbus(struct pci_bus *bus);
-- 
1.7.7

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