linux-kernel - [PATCH] PCI / Hotplug: Fix unexpected driver unregister in pciehp

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Message-Id: <201012161659.39804.rjw@sisk.pl>
Date:	Thu, 16 Dec 2010 16:59:39 +0100
From:	"Rafael J. Wysocki" <rjw@...k.pl>
To:	Jesse Barnes <jbarnes@...tuousgeek.org>
Cc:	linux-pci@...r.kernel.org,
	ACPI Devel Maling List <linux-acpi@...r.kernel.org>,
	LKML <linux-kernel@...r.kernel.org>,
	Matthew Garrett <mjg59@...f.ucam.org>
Subject: [PATCH] PCI / Hotplug: Fix unexpected driver unregister in pciehp_acpi.c

From: Rafael J. Wysocki <rjw@...k.pl>

If pcie_ports_disabled is set, pcie_port_service_register() returns
error code and select_detection_mode() should not attempt to
unregister dummy_driver and use dummy_slots.  It should return
PCIEHP_DETECT_ACPI immediately instead.

Signed-off-by: Rafael J. Wysocki <rjw@...k.pl>
---
 drivers/pci/hotplug/pciehp_acpi.c |    3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

Index: linux-2.6/drivers/pci/hotplug/pciehp_acpi.c
===================================================================
--- linux-2.6.orig/drivers/pci/hotplug/pciehp_acpi.c
+++ linux-2.6/drivers/pci/hotplug/pciehp_acpi.c
@@ -115,7 +115,8 @@ static struct pcie_port_service_driver _
 static int __init select_detection_mode(void)
 {
 	struct dummy_slot *slot, *tmp;
-	pcie_port_service_register(&dummy_driver);
+	if (pcie_port_service_register(&dummy_driver))
+		return PCIEHP_DETECT_ACPI;
 	pcie_port_service_unregister(&dummy_driver);
 	list_for_each_entry_safe(slot, tmp, &dummy_slots, list) {
 		list_del(&slot->list);
--
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