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x86: I/O APIC: keep IRQ off when changing LVT registers

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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 <macro@linux-mips.org>
Signed-off-by: Ingo Molnar <mingo@elte.hu>
This commit is contained in:
Maciej W. Rozycki 2008-05-21 22:09:34 +01:00 committed by Ingo Molnar
parent e67465f129
commit 60134ebe79
2 changed files with 4 additions and 0 deletions
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2
arch/x86/kernel/io_apic_32.c
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@ -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;
}

2
arch/x86/kernel/io_apic_64.c
View File

@ -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;
}