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authorIngo Molnar <mingo@elte.hu>2007-02-16 01:28:24 -0800
committerLinus Torvalds <torvalds@woody.linux-foundation.org>2007-02-16 08:14:00 -0800
commit76d2160147f43f982dfe881404cfde9fd0a9da21 (patch)
tree5140d838f64e8494abd4942b4e2ddf2ddee69046 /kernel
parent1f2ea0837dbc263ce2a2512c4e73c83df68a6a55 (diff)
[PATCH] genirq: do not mask interrupts by default
Never mask interrupts immediately upon request. Disabling interrupts in high-performance codepaths is rare, and on the other hand this change could recover lost edges (or even other types of lost interrupts) by conservatively only masking interrupts after they happen. (NOTE: with this change the highlevel irq-disable code still soft-disables this IRQ line - and if such an interrupt happens then the IRQ flow handler keeps the IRQ masked.) Mark i8529A controllers as 'never loses an edge'. Signed-off-by: Ingo Molnar <mingo@elte.hu> Cc: Thomas Gleixner <tglx@linutronix.de> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'kernel')
-rw-r--r--kernel/irq/chip.c17
1 files changed, 10 insertions, 7 deletions
diff --git a/kernel/irq/chip.c b/kernel/irq/chip.c
index 475e8a71bcdc..76a9106a0bf4 100644
--- a/kernel/irq/chip.c
+++ b/kernel/irq/chip.c
@@ -230,10 +230,6 @@ static void default_enable(unsigned int irq)
*/
static void default_disable(unsigned int irq)
{
- struct irq_desc *desc = irq_desc + irq;
-
- if (!(desc->status & IRQ_DELAYED_DISABLE))
- desc->chip->mask(irq);
}
/*
@@ -298,13 +294,18 @@ handle_simple_irq(unsigned int irq, struct irq_desc *desc)
if (unlikely(desc->status & IRQ_INPROGRESS))
goto out_unlock;
- desc->status &= ~(IRQ_REPLAY | IRQ_WAITING);
kstat_cpu(cpu).irqs[irq]++;
action = desc->action;
- if (unlikely(!action || (desc->status & IRQ_DISABLED)))
+ if (unlikely(!action || (desc->status & IRQ_DISABLED))) {
+ if (desc->chip->mask)
+ desc->chip->mask(irq);
+ desc->status &= ~(IRQ_REPLAY | IRQ_WAITING);
+ desc->status |= IRQ_PENDING;
goto out_unlock;
+ }
+ desc->status &= ~(IRQ_REPLAY | IRQ_WAITING | IRQ_PENDING);
desc->status |= IRQ_INPROGRESS;
spin_unlock(&desc->lock);
@@ -396,11 +397,13 @@ handle_fasteoi_irq(unsigned int irq, struct irq_desc *desc)
/*
* If its disabled or no action available
- * keep it masked and get out of here
+ * then mask it and get out of here:
*/
action = desc->action;
if (unlikely(!action || (desc->status & IRQ_DISABLED))) {
desc->status |= IRQ_PENDING;
+ if (desc->chip->mask)
+ desc->chip->mask(irq);
goto out;
}