diff options
| author | Maciej W. Rozycki <macro@linux-mips.org> | 2008-05-21 22:10:22 +0100 |
|---|---|---|
| committer | Ingo Molnar <mingo@elte.hu> | 2008-07-08 09:12:59 +0200 |
| commit | 35542c5ebced864776d90d83d1e255016fd4c084 (patch) | |
| tree | 2d190b468fbd76286762a25656452492b89acb9e /arch | |
| parent | a1133d8e4ffc2db751eb987a2f3cf8ead67927c3 (diff) | |
x86: I/O APIC: clean up the 8259A on a NMI watchdog failure
There is no point in keeping the 8259A enabled if the I/O APIC NMI
watchdog has failed and the 8259A is not used to pass through regular
timer interrupts. This fixes problems with some systems where some logic
gets confused.
Signed-off-by: Maciej W. Rozycki <macro@linux-mips.org>
Signed-off-by: Ingo Molnar <mingo@elte.hu>
Diffstat (limited to 'arch')
| -rw-r--r-- | arch/x86/kernel/io_apic_32.c | 2 | ||||
| -rw-r--r-- | arch/x86/kernel/io_apic_64.c | 2 | ||||
| -rw-r--r-- | arch/x86/kernel/nmi_32.c | 4 | ||||
| -rw-r--r-- | arch/x86/kernel/nmi_64.c | 11 |
4 files changed, 17 insertions, 2 deletions
diff --git a/arch/x86/kernel/io_apic_32.c b/arch/x86/kernel/io_apic_32.c index 41218ac75d1..7c7d88ebb96 100644 --- a/arch/x86/kernel/io_apic_32.c +++ b/arch/x86/kernel/io_apic_32.c @@ -58,6 +58,7 @@ static struct { int pin, apic; } ioapic_i8259 = { -1, -1 }; static DEFINE_SPINLOCK(ioapic_lock); static DEFINE_SPINLOCK(vector_lock); +int timer_through_8259 __initdata; /* * Is the SiS APIC rmw bug present ? @@ -2194,6 +2195,7 @@ static inline void __init check_timer(void) enable_8259A_irq(0); if (timer_irq_works()) { printk("works.\n"); + timer_through_8259 = 1; if (pin1 != -1) replace_pin_at_irq(0, apic1, pin1, apic2, pin2); else diff --git a/arch/x86/kernel/io_apic_64.c b/arch/x86/kernel/io_apic_64.c index aa45a85c4d1..2a60bfb7446 100644 --- a/arch/x86/kernel/io_apic_64.c +++ b/arch/x86/kernel/io_apic_64.c @@ -90,6 +90,7 @@ static int no_timer_check; static int disable_timer_pin_1 __initdata; +int timer_through_8259 __initdata; /* Where if anywhere is the i8259 connect in external int mode */ static struct { int pin, apic; } ioapic_i8259 = { -1, -1 }; @@ -1700,6 +1701,7 @@ static inline void __init check_timer(void) enable_8259A_irq(0); if (timer_irq_works()) { apic_printk(APIC_VERBOSE," works.\n"); + timer_through_8259 = 1; nmi_watchdog_default(); if (nmi_watchdog == NMI_IO_APIC) { disable_8259A_irq(0); diff --git a/arch/x86/kernel/nmi_32.c b/arch/x86/kernel/nmi_32.c index d322901c38e..6580dae4627 100644 --- a/arch/x86/kernel/nmi_32.c +++ b/arch/x86/kernel/nmi_32.c @@ -24,6 +24,8 @@ #include <linux/kdebug.h> #include <linux/slab.h> +#include <asm/i8259.h> +#include <asm/io_apic.h> #include <asm/smp.h> #include <asm/nmi.h> #include <asm/timer.h> @@ -131,6 +133,8 @@ int __init check_nmi_watchdog(void) kfree(prev_nmi_count); return 0; error: + if (nmi_watchdog == NMI_IO_APIC && !timer_through_8259) + disable_8259A_irq(0); timer_ack = 0; return -1; diff --git a/arch/x86/kernel/nmi_64.c b/arch/x86/kernel/nmi_64.c index 5a29ded994f..0060e44e898 100644 --- a/arch/x86/kernel/nmi_64.c +++ b/arch/x86/kernel/nmi_64.c @@ -21,6 +21,8 @@ #include <linux/cpumask.h> #include <linux/kdebug.h> +#include <asm/i8259.h> +#include <asm/io_apic.h> #include <asm/smp.h> #include <asm/nmi.h> #include <asm/proto.h> @@ -90,7 +92,7 @@ int __init check_nmi_watchdog(void) prev_nmi_count = kmalloc(NR_CPUS * sizeof(int), GFP_KERNEL); if (!prev_nmi_count) - return -1; + goto error; printk(KERN_INFO "Testing NMI watchdog ... "); @@ -121,7 +123,7 @@ int __init check_nmi_watchdog(void) if (!atomic_read(&nmi_active)) { kfree(prev_nmi_count); atomic_set(&nmi_active, -1); - return -1; + goto error; } printk("OK.\n"); @@ -132,6 +134,11 @@ int __init check_nmi_watchdog(void) kfree(prev_nmi_count); return 0; +error: + if (nmi_watchdog == NMI_IO_APIC && !timer_through_8259) + disable_8259A_irq(0); + + return -1; } static int __init setup_nmi_watchdog(char *str) |