[GIT pull] x86 fix for 4.13

[Thomas Gleixner]

Linus,

please pull the latest x86-urgent-for-linus git tree from:

   git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip.git 
x86-urgent-for-linus

The recent irq core changes unearthed API abuse in the HPET code, which
manifested itself in a suspend/resume regression. The fix replaces the
cruft with the proper function calls and cures the regression.

Thanks,

        tglx

------------------>
Thomas Gleixner (1):
      x86/hpet: Cure interface abuse in the resume path


 arch/x86/kernel/hpet.c | 27 +++++++++++----------------
 1 file changed, 11 insertions(+), 16 deletions(-)

diff --git a/arch/x86/kernel/hpet.c b/arch/x86/kernel/hpet.c
index 16f82a3aaec7..8ce4212e2b8d 100644
--- a/arch/x86/kernel/hpet.c
+++ b/arch/x86/kernel/hpet.c
@@ -345,21 +345,10 @@ static int hpet_shutdown(struct clock_event_device *evt, 
int timer)
        return 0;
 }
 
-static int hpet_resume(struct clock_event_device *evt, int timer)
-{
-       if (!timer) {
-               hpet_enable_legacy_int();
-       } else {
-               struct hpet_dev *hdev = EVT_TO_HPET_DEV(evt);
-
-               irq_domain_deactivate_irq(irq_get_irq_data(hdev->irq));
-               irq_domain_activate_irq(irq_get_irq_data(hdev->irq));
-               disable_hardirq(hdev->irq);
-               irq_set_affinity(hdev->irq, cpumask_of(hdev->cpu));
-               enable_irq(hdev->irq);
-       }
+static int hpet_resume(struct clock_event_device *evt)
+{
+       hpet_enable_legacy_int();
        hpet_print_config();
-
        return 0;
 }
 
@@ -417,7 +406,7 @@ static int hpet_legacy_set_periodic(struct 
clock_event_device *evt)
 
 static int hpet_legacy_resume(struct clock_event_device *evt)
 {
-       return hpet_resume(evt, 0);
+       return hpet_resume(evt);
 }
 
 static int hpet_legacy_next_event(unsigned long delta,
@@ -510,8 +499,14 @@ static int hpet_msi_set_periodic(struct clock_event_device 
*evt)
 static int hpet_msi_resume(struct clock_event_device *evt)
 {
        struct hpet_dev *hdev = EVT_TO_HPET_DEV(evt);
+       struct irq_data *data = irq_get_irq_data(hdev->irq);
+       struct msi_msg msg;
 
-       return hpet_resume(evt, hdev->num);
+       /* Restore the MSI msg and unmask the interrupt */
+       irq_chip_compose_msi_msg(data, &msg);
+       hpet_msi_write(hdev, &msg);
+       hpet_msi_unmask(data);
+       return 0;
 }
 
 static int hpet_msi_next_event(unsigned long delta,