linux-kernel - [RFC PATCH 02/14] PCI, x86: Move pci_enable

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Message-Id: <1333419581-7836-3-git-send-email-yinghai@kernel.org>
Date:	Mon,  2 Apr 2012 19:19:29 -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 02/14] PCI, x86: Move pci_enable_bridges() down

After we get hot-added ioapic registered.

pci_enable_bridges will try to enable ioapic irq for pci bridge.

So need to move it down.

Or We can move out pcibios_enable_irq() out of pci_enable_device()
and call pcibios_enable_irq in pci_bus_add_devices ?
also will need to move ...
        pcibios_resource_survey_bus(root->bus);
        pci_assign_unassigned_bus_resources(root->bus);
to the start add ....

Signed-off-by: Yinghai Lu <yinghai@...nel.org>
---
 arch/x86/pci/legacy.c   |    1 +
 drivers/acpi/pci_root.c |    3 +++
 drivers/pci/probe.c     |    1 +
 drivers/pci/setup-bus.c |    2 --
 4 files changed, 5 insertions(+), 2 deletions(-)

diff --git a/arch/x86/pci/legacy.c b/arch/x86/pci/legacy.c
index 8b6048a..5c63bb6 100644
--- a/arch/x86/pci/legacy.c
+++ b/arch/x86/pci/legacy.c
@@ -101,6 +101,7 @@ void __ref pcibios_root_rescan(void)
 
 		pcibios_resource_survey_bus(bus);
 		pci_assign_unassigned_bus_resources(bus);
+		pci_enable_bridges(bus);
 
 		pci_bus_add_devices(bus);
 	}
diff --git a/drivers/acpi/pci_root.c b/drivers/acpi/pci_root.c
index ce662ae..95b8f22 100644
--- a/drivers/acpi/pci_root.c
+++ b/drivers/acpi/pci_root.c
@@ -644,6 +644,9 @@ static int acpi_pci_root_start(struct acpi_device *device)
 		if (driver->add)
 			driver->add(device->handle);
 
+	/* need to after hot-added ioapic is registered */
+	pci_enable_bridges(root->bus);
+
 	pci_bus_add_devices(root->bus);
 	mutex_unlock(&acpi_pci_root_lock);
 
diff --git a/drivers/pci/probe.c b/drivers/pci/probe.c
index bfa111b..320f38e 100644
--- a/drivers/pci/probe.c
+++ b/drivers/pci/probe.c
@@ -2065,6 +2065,7 @@ unsigned int __ref pci_rescan_bus(struct pci_bus *bus)
 
 	max = pci_scan_child_bus(bus);
 	pci_assign_unassigned_bus_resources(bus);
+	pci_enable_bridges(bus);
 	pci_bus_add_devices(bus);
 
 	return max;
diff --git a/drivers/pci/setup-bus.c b/drivers/pci/setup-bus.c
index d9a5500..20ccd89 100644
--- a/drivers/pci/setup-bus.c
+++ b/drivers/pci/setup-bus.c
@@ -1504,6 +1504,4 @@ void pci_assign_unassigned_bus_resources(struct pci_bus *bus)
 	up_read(&pci_bus_sem);
 	__pci_bus_assign_resources(bus, &add_list, NULL);
 	BUG_ON(!list_empty(&add_list));
-
-	pci_enable_bridges(bus);
 }
-- 
1.7.7

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