From: David Shaohua Li <shaohua.li@intel.com>
Date: Wed, 3 Aug 2005 15:00:11 +0000 (-0400)
Subject: [ACPI] PCI interrupt link suspend/resume - revert to 2.6.12 behaviour
X-Git-Tag: v2.6.13-rc6~73^2^2~3
X-Git-Url: https://err.no/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=ecc21ebe603af31f172c43b8b261df79040790ef;p=linux-2.6

[ACPI] PCI interrupt link suspend/resume - revert to 2.6.12 behaviour

This patch disables the PCI Interrupt Link refernece counts,
which should not co-exist with the 2.6.12 irq_router.resume
method or else a double acpi_pci_link_set() could result
on resume.

Signed-off-by: David Shaohua Li <shaohua.li@intel.com>
Signed-off-by: Len Brown <len.brown@intel.com>
---

diff --git a/drivers/acpi/pci_link.c b/drivers/acpi/pci_link.c
index 6a29610edc..0091dbdf7e 100644
--- a/drivers/acpi/pci_link.c
+++ b/drivers/acpi/pci_link.c
@@ -692,7 +692,18 @@ acpi_pci_link_free_irq(acpi_handle handle)
 		return_VALUE(-1);
 	}
 
+#ifdef	FUTURE_USE
+	/*
+	 * The Link reference count allows us to _DISable an unused link
+	 * and suspend time, and set it again  on resume.
+	 * However, 2.6.12 still has irq_router.resume
+	 * which blindly restores the link state.
+	 * So we disable the reference count method
+	 * to prevent duplicate acpi_pci_link_set()
+	 * which would harm some systems
+	 */
 	link->refcnt --;
+#endif
 	ACPI_DEBUG_PRINT((ACPI_DB_INFO,
 		"Link %s is dereferenced\n", acpi_device_bid(link->device)));