x86: I/O APIC: unmask the second-chance timer interrupt

Unmask the timer interrupt line set up in the through-8259A mode
explicitly after setup_timer_IRQ0_pin() has set up the I/O APIC interrupt
redirection entry to let the two operations be unbound from each other.

Signed-off-by: Maciej W. Rozycki <macro@linux-mips.org>
Signed-off-by: Ingo Molnar <mingo@elte.hu>

diff --git a/arch/x86/kernel/io_apic_32.c b/arch/x86/kernel/io_apic_32.c
index ce682e8..b381f93 100644 (file)
--- a/arch/x86/kernel/io_apic_32.c
+++ b/arch/x86/kernel/io_apic_32.c
@@ -2185,6 +2185,7 @@ static inline void __init check_timer(void)
                 * legacy devices should be connected to IO APIC #0
                 */
                setup_timer_IRQ0_pin(apic2, pin2, vector);
+               unmask_IO_APIC_irq(0);
                enable_8259A_irq(0);
                if (timer_irq_works()) {
                        printk("works.\n");

diff --git a/arch/x86/kernel/io_apic_64.c b/arch/x86/kernel/io_apic_64.c
index 6c4635f..0e20b7d 100644 (file)
--- a/arch/x86/kernel/io_apic_64.c
+++ b/arch/x86/kernel/io_apic_64.c
@@ -1691,6 +1691,7 @@ static inline void __init check_timer(void)
                 * legacy devices should be connected to IO APIC #0
                 */
                setup_timer_IRQ0_pin(apic2, pin2, cfg->vector);
+               unmask_IO_APIC_irq(0);
                enable_8259A_irq(0);
                if (timer_irq_works()) {
                        apic_printk(APIC_VERBOSE," works.\n");