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authorYinghai Lu <yhlu.kernel@gmail.com>2008-09-15 01:53:50 -0700
committerIngo Molnar <mingo@elte.hu>2008-10-16 16:53:10 +0200
commite00585bb7fc3d0b601181b765a254df7ff4ea59b (patch)
tree731d07071f04f54fbf4269912524455e54002858 /kernel/irq/spurious.c
parent56ffa1a028b9fce3860a247c6fe79fce7cbf425b (diff)
irq: fix irqpoll && sparseirq
Steven Noonan reported a boot hang when using irqpoll and CONFIG_HAVE_SPARSE_IRQ=y. The irqpoll loop needs to be updated to not iterate from 1 to nr_irqs but to iterate via for_each_irq_desc(). (in the former case desc can be NULL which crashes the box) Reported-by: Steven Noonan <steven@uplinklabs.net> Tested-by: Steven Noonan <steven@uplinklabs.net> Signed-off-by: Ingo Molnar <mingo@elte.hu>
Diffstat (limited to 'kernel/irq/spurious.c')
-rw-r--r--kernel/irq/spurious.c17
1 files changed, 11 insertions, 6 deletions
diff --git a/kernel/irq/spurious.c b/kernel/irq/spurious.c
index b5d906002e1..ec5a4bef305 100644
--- a/kernel/irq/spurious.c
+++ b/kernel/irq/spurious.c
@@ -90,14 +90,15 @@ static int misrouted_irq(int irq)
{
int i;
int ok = 0;
+ struct irq_desc *desc;
- for (i = 1; i < nr_irqs; i++) {
- struct irq_desc *desc;
+ for_each_irq_desc(i, desc) {
+ if (!i)
+ continue;
if (i == irq) /* Already tried */
continue;
- desc = irq_to_desc(i);
if (try_one_irq(i, desc))
ok = 1;
}
@@ -108,10 +109,14 @@ static int misrouted_irq(int irq)
static void poll_spurious_irqs(unsigned long dummy)
{
int i;
- for (i = 1; i < nr_irqs; i++) {
- struct irq_desc *desc = irq_to_desc(i);
+ struct irq_desc *desc;
+
+ for_each_irq_desc(i, desc) {
unsigned int status;
+ if (!i)
+ continue;
+
/* Racy but it doesn't matter */
status = desc->status;
barrier();
@@ -278,7 +283,7 @@ static int __init irqfixup_setup(char *str)
__setup("irqfixup", irqfixup_setup);
module_param(irqfixup, int, 0644);
-MODULE_PARM_DESC("irqfixup", "0: No fixup, 1: irqfixup mode 2: irqpoll mode");
+MODULE_PARM_DESC("irqfixup", "0: No fixup, 1: irqfixup mode, 2: irqpoll mode");
static int __init irqpoll_setup(char *str)
{