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x86, intr-remap: fix x2apic/intr-remap resume 

Interrupt remapping was decoupled from x2apic. Shouldn't check
x2apic before resume interrupt remapping. Otherwise, interrupt
remapping won't be resumed when x2apic is not enabled.

[ Impact: fix potential intr-remap resume hang on !x2apic ]

Signed-off-by: Suresh Siddha <suresh.b.siddha@intel.com>
Signed-off-by: Weidong Han <weidong.han@intel.com>
Acked-by: David Woodhouse <David.Woodhouse@intel.com>
Cc: iommu@lists.linux-foundation.org
Cc: allen.m.kay@intel.com
Cc: fenghua.yu@intel.com
LKML-Reference: <1239957736-6161-6-git-send-email-weidong.han@intel.com>
Signed-off-by: Ingo Molnar <mingo@elte.hu>
This commit is contained in:
Weidong Han 2009-04-17 16:42:16 +08:00 committed by Ingo Molnar
parent 03ea815506
commit 9a2755c356
1 changed files with 9 additions and 6 deletions
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15
arch/x86/kernel/apic/apic.c
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@ -2032,7 +2032,7 @@ static int lapic_resume(struct sys_device *dev)
return 0;
local_irq_save(flags);
if (x2apic) {
if (intr_remapping_enabled) {
ioapic_entries = alloc_ioapic_entries();
if (!ioapic_entries) {
WARN(1, "Alloc ioapic_entries in lapic resume failed.");
@ -2048,8 +2048,10 @@ static int lapic_resume(struct sys_device *dev)
mask_IO_APIC_setup(ioapic_entries);
mask_8259A();
enable_x2apic();
}
if (x2apic)
enable_x2apic();
#else
if (!apic_pm_state.active)
return 0;
@ -2097,10 +2099,12 @@ static int lapic_resume(struct sys_device *dev)
apic_read(APIC_ESR);
#ifdef CONFIG_INTR_REMAP
if (intr_remapping_enabled)
reenable_intr_remapping(EIM_32BIT_APIC_ID);
if (intr_remapping_enabled) {
if (x2apic)
reenable_intr_remapping(EIM_32BIT_APIC_ID);
else
reenable_intr_remapping(EIM_8BIT_APIC_ID);
if (x2apic) {
unmask_8259A();
restore_IO_APIC_setup(ioapic_entries);
free_ioapic_entries(ioapic_entries);
@ -2109,7 +2113,6 @@ static int lapic_resume(struct sys_device *dev)
local_irq_restore(flags);
return 0;
}