[4.2.y-ckt stable] Patch "ACPI / PM: Fix incorrect wakeup IRQ setting during suspend-to-idle" has been added to staging queue

[Kamal Mostafa]

This is a note to let you know that I have just added a patch titled

    ACPI / PM: Fix incorrect wakeup IRQ setting during suspend-to-idle

to the linux-4.2.y-queue branch of the 4.2.y-ckt extended stable tree 
which can be found at:

    http://kernel.ubuntu.com/git/ubuntu/linux.git/log/?h=linux-4.2.y-queue

This patch is scheduled to be released in version 4.2.8-ckt1.

If you, or anyone else, feels it should not be added to this tree, please 
reply to this email.

For more information about the 4.2.y-ckt tree, see
https://wiki.ubuntu.com/Kernel/Dev/ExtendedStable

Thanks.
-Kamal

------

>From 3c24044a9db6d67333ac55824b54a7f624818d00 Mon Sep 17 00:00:00 2001
From: Chen Yu <yu.c.chen at intel.com>
Date: Sun, 25 Oct 2015 01:02:46 +0800
Subject: ACPI / PM: Fix incorrect wakeup IRQ setting during suspend-to-idle

commit 8c01275e0cdf1959aa25c322fd5870c097733195 upstream.

For an ACPI compatible system, the SCI (ACPI System Control
Interrupt) is used to wake the system up from suspend-to-idle.
Once the CPU is woken up by the SCI, the interrupt handler will
first check if the current IRQ has been configured for system
wakeup, so irq_pm_check_wakeup() is invoked to validate the IRQ
number.  However, during suspend-to-idle, enable_irq_wake() is
called for acpi_gbl_FADT.sci_interrupt, although the IRQ number
that the SCI handler has been installed for should be passed to
it instead.  Thus, if acpi_gbl_FADT.sci_interrupt happens to be
different from that number, ACPI interrupts will not be able to
wake up the system from sleep.

Fix this problem by passing the IRQ number returned by
acpi_gsi_to_irq() to enable_irq_wake() instead of
acpi_gbl_FADT.sci_interrupt.

Acked-by: Lv Zheng <lv.zheng at intel.com>
Signed-off-by: Chen Yu <yu.c.chen at intel.com>
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki at intel.com>
Signed-off-by: Kamal Mostafa <kamal at canonical.com>
---
 drivers/acpi/sleep.c | 6 ++++--
 1 file changed, 4 insertions(+), 2 deletions(-)

diff --git a/drivers/acpi/sleep.c b/drivers/acpi/sleep.c
index 2f0d4db..3fe1fbe 100644
--- a/drivers/acpi/sleep.c
+++ b/drivers/acpi/sleep.c
@@ -632,14 +632,16 @@ static int acpi_freeze_prepare(void)
 	acpi_enable_wakeup_devices(ACPI_STATE_S0);
 	acpi_enable_all_wakeup_gpes();
 	acpi_os_wait_events_complete();
-	enable_irq_wake(acpi_gbl_FADT.sci_interrupt);
+	if (acpi_sci_irq_valid())
+		enable_irq_wake(acpi_sci_irq);
 	return 0;
 }

 static void acpi_freeze_restore(void)
 {
 	acpi_disable_wakeup_devices(ACPI_STATE_S0);
-	disable_irq_wake(acpi_gbl_FADT.sci_interrupt);
+	if (acpi_sci_irq_valid())
+		disable_irq_wake(acpi_sci_irq);
 	acpi_enable_all_runtime_gpes();
 }

--
1.9.1