From: Matthew Garrett <mjg@redhat.com>
Date: Fri, 6 Mar 2009 23:29:57 +0000
Subject: [acpi] disable GPEs at the start of resume
Message-id: 20090306232957.GA18853@srcf.ucam.org
O-Subject: [RHEL 5.4 PATCH] ACPI: disable GPEs at the start of resume
Bugzilla: 456302
RH-Acked-by: Brian Maly <bmaly@redhat.com>
RH-Acked-by: Prarit Bhargava <prarit@redhat.com>
RH-Acked-by: Peter Martuccelli <peterm@redhat.com>

Bugzilla: 456302

At wakeup time, unhandled GPEs may fire before handlers have been set
up. Disable GPEs at the beginning of wakeup and reenable them when we're
ready to handle them. Backport of upstream
a3627f67b1d5ddd8f65eedc2a76da90fbe062530

diff --git a/drivers/acpi/sleep/main.c b/drivers/acpi/sleep/main.c
index 62ce87d..c39b111 100644
--- a/drivers/acpi/sleep/main.c
+++ b/drivers/acpi/sleep/main.c
@@ -113,6 +113,13 @@ static int acpi_pm_enter(suspend_state_t pm_state)
 	if (ACPI_SUCCESS(status) && (acpi_state == ACPI_STATE_S3))
 		acpi_clear_event(ACPI_EVENT_POWER_BUTTON);
 
+	/*
+	 * Disable and clear GPE status before interrupt is enabled. Some GPEs
+	 * (like wakeup GPE) haven't handler, this can avoid such GPE misfire.
+	 * acpi_leave_sleep_state will reenable specific GPEs later
+	 */
+	acpi_hw_disable_all_gpes();
+
 	local_irq_restore(flags);
 	printk(KERN_DEBUG "Back to C!\n");