Commit-ID: 6fd36ba02132c61f67ebefff77fe710bd38ba95a
Gitweb: http://git.kernel.org/tip/6fd36ba02132c61f67ebefff77fe710bd38ba95a
Author: Mathias Nyman <mathias.nyman@xxxxxxxxxxxxxxx>
AuthorDate: Thu, 10 Nov 2011 13:45:24 +0000
Committer: Ingo Molnar <mingo@xxxxxxx>
CommitDate: Thu, 10 Nov 2011 18:31:23 +0100
x86, ioapic: Only print ioapic debug information for IRQs belonging to an ioapic chip
with "apic=verbose" the print_IO_APIC() function tries to print
IRQ to pin mappings for every active irq. It assumes chip_data
is of type irq_cfg and may cause an oops if not.
As the print_IO_APIC() is called from a late_initcall other
chained irq chips may already be registered with custom
chip_data information, causing an oops. This is the case with
intel MID SoC devices with gpio demuxers registered as irq_chips.
Signed-off-by: Mathias Nyman <mathias.nyman@xxxxxxxxxxxxxxx>
Signed-off-by: Alan Cox <alan@xxxxxxxxxxxxxxx>
[ -v2: fixed build failure ]
Signed-off-by: Ingo Molnar <mingo@xxxxxxx>
---
arch/x86/kernel/apic/io_apic.c | 5 +++++
arch/x86/kernel/nmi.c | 1 +
2 files changed, 6 insertions(+), 0 deletions(-)
diff --git a/arch/x86/kernel/apic/io_apic.c b/arch/x86/kernel/apic/io_apic.c
index 841b8da..6d939d7 100644
--- a/arch/x86/kernel/apic/io_apic.c
+++ b/arch/x86/kernel/apic/io_apic.c
@@ -1694,6 +1694,7 @@ __apicdebuginit(void) print_IO_APICs(void)
int ioapic_idx;
struct irq_cfg *cfg;
unsigned int irq;
+ struct irq_chip *chip;
printk(KERN_DEBUG "number of MP IRQ sources: %d.\n", mp_irq_entries);
for (ioapic_idx = 0; ioapic_idx < nr_ioapics; ioapic_idx++)
@@ -1714,6 +1715,10 @@ __apicdebuginit(void) print_IO_APICs(void)
for_each_active_irq(irq) {
struct irq_pin_list *entry;
+ chip = irq_get_chip(irq);
+ if (chip != &ioapic_chip)
+ continue;
+
cfg = irq_get_chip_data(irq);
if (!cfg)
continue;
diff --git a/arch/x86/kernel/nmi.c b/arch/x86/kernel/nmi.c
index 27d1e7c..e88f37b 100644
--- a/arch/x86/kernel/nmi.c
+++ b/arch/x86/kernel/nmi.c
@@ -29,6 +29,7 @@
#include <asm/traps.h>
#include <asm/mach_traps.h>
#include <asm/nmi.h>
+#include <asm/x86_init.h>
#define NMI_MAX_NAMELEN 16
struct nmiaction {
--
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