linux-kernel - [Bugfix v4 2/2] ACPI, PCI: Prevent binding other PCI drivers to IOAPIC PCI devices

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Date:	Fri,  9 Oct 2015 22:07:32 +0800
From:	Jiang Liu <jiang.liu@...ux.intel.com>
To:	Joerg Roedel <joro@...tes.org>, Borislav Petkov <bp@...en8.de>,
	Bjorn Helgaas <bhelgaas@...gle.com>,
	Daniel Vetter <daniel@...ll.ch>,
	Alex Deucher <alexdeucher@...il.com>,
	Christian König <christian.koenig@....com>
Cc:	Jiang Liu <jiang.liu@...ux.intel.com>,
	linux-kernel@...r.kernel.org, linux-pci@...r.kernel.org,
	linux-iommu@...r.kernel.org, linux-acpi@...r.kernel.org,
	x86@...nel.org
Subject: [Bugfix v4 2/2] ACPI, PCI: Prevent binding other PCI drivers to IOAPIC PCI devices

The ACPI IOAPIC driver makes use of IOAPIC PCI devices, so prevent
binding other PCI drivers to IOAPIC PCI devices used by ACPI IOAPIC
driver.

Signed-off-by: Jiang Liu <jiang.liu@...ux.intel.com>
---
 drivers/acpi/ioapic.c |    7 +++++--
 1 file changed, 5 insertions(+), 2 deletions(-)

diff --git a/drivers/acpi/ioapic.c b/drivers/acpi/ioapic.c
index ccdc8db16bb8..da71b274fc21 100644
--- a/drivers/acpi/ioapic.c
+++ b/drivers/acpi/ioapic.c
@@ -162,12 +162,14 @@ done:
 	list_add(&ioapic->list, &ioapic_list);
 	mutex_unlock(&ioapic_list_lock);
 
-	if (dev)
+	if (dev) {
+		dev->match_driver = false;
 		dev_info(&dev->dev, "%s at %pR, GSI %u\n",
 			 type, res, (u32)gsi_base);
-	else
+	} else {
 		acpi_handle_info(handle, "%s at %pR, GSI %u\n",
 				 type, res, (u32)gsi_base);
+	}
 
 	return AE_OK;
 
@@ -216,6 +218,7 @@ int acpi_ioapic_remove(struct acpi_pci_root *root)
 		if (ioapic->pdev) {
 			pci_release_region(ioapic->pdev, 0);
 			pci_disable_device(ioapic->pdev);
+			ioapic->pdev->match_driver = true;
 			pci_dev_put(ioapic->pdev);
 		} else if (ioapic->res.flags && ioapic->res.parent) {
 			release_resource(&ioapic->res);
-- 
1.7.10.4

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