Messages in this thread Patch in this message | | | Date | Wed, 12 Dec 2007 14:50:02 -0500 (EST) | From | Steven Rostedt <> | Subject | [PATCH] handle IRQ_PENDING for simple irq handler |
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With the IO-APIC pcix hack (level=>edge masking), we can receive interrupts while masked. But these interrupts might be missed.
Also, normal "simple" interrupts might be missed too on leaving of thread handler.
Signed-off-by: Steven Rostedt <srostedt@redhat.com>
Index: linux-2.6.21-rt-hack/kernel/irq/manage.c =================================================================== --- linux-2.6.21-rt-hack.orig/kernel/irq/manage.c +++ linux-2.6.21-rt-hack/kernel/irq/manage.c @@ -628,14 +628,17 @@ static void thread_simple_irq(irq_desc_t unsigned int irq = desc - irq_desc; irqreturn_t action_ret;
- if (action && !desc->depth) { + do { + if (!action || desc->depth) + break; + desc->status &= ~IRQ_PENDING; spin_unlock(&desc->lock); action_ret = handle_IRQ_event(irq, action); cond_resched_hardirq_context(); spin_lock_irq(&desc->lock); if (!noirqdebug) note_interrupt(irq, desc, action_ret); - } + } while (desc->status & IRQ_PENDING); desc->status &= ~IRQ_INPROGRESS; }
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