linux-kernel - [PATCH 24/37] ACPI: clear GPE earily in resume to avoid warning

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Date:	Thu, 31 Jan 2008 23:36:55 -0500
From:	Len Brown <lenb@...nel.org>
To:	linux-pm@...ts.linux-foundation.org
Cc:	linux-acpi@...r.kernel.org, linux-kernel@...r.kernel.org,
	Shaohua Li <shaohua.li@...el.com>,
	Len Brown <len.brown@...el.com>
Subject: [PATCH 24/37] ACPI: clear GPE earily in resume to avoid warning

From: Shaohua Li <shaohua.li@...el.com>

Wakeup GPE hasn't a handler. If system is waked up by such GPE like a
USB hotplug, I saw a lot of error reporting the GPE hasn't handler.
acpi_leave_sleep_state will clear the GPE but it's too late, we should
do it before interrupt is re-enabled.

Signed-off-by: Shaohua Li <shaohua.li@...el.com>
Acked-by: Rafael J. Wysocki <rjw@...k.pl>
Signed-off-by: Len Brown <len.brown@...el.com>
---
 drivers/acpi/sleep/main.c |    7 +++++++
 1 files changed, 7 insertions(+), 0 deletions(-)

diff --git a/drivers/acpi/sleep/main.c b/drivers/acpi/sleep/main.c
index cbfa058..96d23b3 100644
--- a/drivers/acpi/sleep/main.c
+++ b/drivers/acpi/sleep/main.c
@@ -146,6 +146,13 @@ 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");
 
-- 
1.5.4.rc5.16.gc0279

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