Re: [PATCH] x86/microcode: Do not access the initrd after it has been freed

[Thomas Gleixner]

On Tue, 31 Jan 2017, Mike Galbraith wrote:

> On Tue, 2017-01-31 at 11:01 +0100, Borislav Petkov wrote:
> > On Tue, Jan 31, 2017 at 08:43:55AM +0100, Ingo Molnar wrote:
> > > (Cc:-ed Mike as this could explain his early boot crash/hang?
> > >         Mike: please try -tip f18a8a0143b1 that I just pushed out. )
> > 
> > One other thing to try, Mike, is boot with "dis_ucode_ldr". See whether
> > that makes it go away.
> 
> (bisect fingered irqdomain: Avoid activating interrupts more than once)

That commit exposed interesting code in x86 land. Can you please try the
patch below?

Thanks,

        tglx
8<--------------

diff --git a/arch/x86/kernel/apic/io_apic.c b/arch/x86/kernel/apic/io_apic.c
index 1e35dd06b090..52f352b063fd 100644
--- a/arch/x86/kernel/apic/io_apic.c
+++ b/arch/x86/kernel/apic/io_apic.c
@@ -2117,6 +2117,7 @@ static inline void __init check_timer(void)
                        if (idx != -1 && irq_trigger(idx))
                                unmask_ioapic_irq(irq_get_chip_data(0));
                }
+               irq_domain_deactivate_irq(irq_data);
                irq_domain_activate_irq(irq_data);
                if (timer_irq_works()) {
                        if (disable_timer_pin_1 > 0)
@@ -2138,6 +2139,7 @@ static inline void __init check_timer(void)
                 * legacy devices should be connected to IO APIC #0
                 */
                replace_pin_at_irq_node(data, node, apic1, pin1, apic2, pin2);
+               irq_domain_deactivate_irq(irq_data);
                irq_domain_activate_irq(irq_data);
                legacy_pic->unmask(0);
                if (timer_irq_works()) {
diff --git a/arch/x86/kernel/hpet.c b/arch/x86/kernel/hpet.c
index 85e87b46c318..dc6ba5bda9fc 100644
--- a/arch/x86/kernel/hpet.c
+++ b/arch/x86/kernel/hpet.c
@@ -352,6 +352,7 @@ static int hpet_resume(struct clock_event_device *evt, int 
timer)
        } 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_irq(hdev->irq);
                irq_set_affinity(hdev->irq, cpumask_of(hdev->cpu));