From: Maciej W. Rozycki Date: Wed, 21 May 2008 21:09:34 +0000 (+0100) Subject: x86: I/O APIC: keep IRQ off when changing LVT registers X-Git-Url: https://git.stricted.de/?a=commitdiff_plain;h=60134ebe795b728dbb960485a8e873c3250ada36;p=GitHub%2Fmoto-9609%2Fandroid_kernel_motorola_exynos9610.git x86: I/O APIC: keep IRQ off when changing LVT registers Disable the 8259A acting in the "virtual wire" mode to keep the interrupt line inactive while fiddling with local APIC interrupt vector registers associated with its destination inputs. To be on the safe side, especially concerning flipping the trigger mode. Signed-off-by: Maciej W. Rozycki Signed-off-by: Ingo Molnar --- diff --git a/arch/x86/kernel/io_apic_32.c b/arch/x86/kernel/io_apic_32.c index e7b7655c4e94..41218ac75d10 100644 --- a/arch/x86/kernel/io_apic_32.c +++ b/arch/x86/kernel/io_apic_32.c @@ -2199,7 +2199,9 @@ static inline void __init check_timer(void) else add_pin_to_irq(0, apic2, pin2); if (nmi_watchdog == NMI_IO_APIC) { + disable_8259A_irq(0); setup_nmi(); + enable_8259A_irq(0); } goto out; } diff --git a/arch/x86/kernel/io_apic_64.c b/arch/x86/kernel/io_apic_64.c index 6433fc99f1f9..aa45a85c4d11 100644 --- a/arch/x86/kernel/io_apic_64.c +++ b/arch/x86/kernel/io_apic_64.c @@ -1702,7 +1702,9 @@ static inline void __init check_timer(void) apic_printk(APIC_VERBOSE," works.\n"); nmi_watchdog_default(); if (nmi_watchdog == NMI_IO_APIC) { + disable_8259A_irq(0); setup_nmi(); + enable_8259A_irq(0); } goto out; }