From 77694b408abb8f92195ad5ed6ce5492f1d794c77 Mon Sep 17 00:00:00 2001 From: Thomas Gleixner Date: Tue, 15 Feb 2011 10:33:57 +0100 Subject: [PATCH] genirq; Add fasteoi irq_chip quirk Some chips want irq_eoi() only called when an interrupt is actually handled. So they have checks for INPROGRESS and DISABLED in their irq_eoi callbacks. Add a chip flag, which allows to handle that in the generic code. No impact on the fastpath. Signed-off-by: Thomas Gleixner --- include/linux/irq.h | 4 +++- kernel/irq/chip.c | 9 ++++++++- 2 files changed, 11 insertions(+), 2 deletions(-) diff --git a/include/linux/irq.h b/include/linux/irq.h index 36390970693c..ea2970c294aa 100644 --- a/include/linux/irq.h +++ b/include/linux/irq.h @@ -328,10 +328,12 @@ struct irq_chip { /* * irq_chip specific flags * - * IRQCHIP_SET_TYPE_MASKED: Mask before calling chip.irq_set_type() + * IRQCHIP_SET_TYPE_MASKED: Mask before calling chip.irq_set_type() + * IRQCHIP_EOI_IF_HANDLED: Only issue irq_eoi() when irq was handled */ enum { IRQCHIP_SET_TYPE_MASKED = (1 << 0), + IRQCHIP_EOI_IF_HANDLED = (1 << 1), }; /* This include will go away once we isolated irq_desc usage to core code */ diff --git a/kernel/irq/chip.c b/kernel/irq/chip.c index 08be5d182be3..1d3e25e68b0c 100644 --- a/kernel/irq/chip.c +++ b/kernel/irq/chip.c @@ -515,9 +515,16 @@ handle_fasteoi_irq(unsigned int irq, struct irq_desc *desc) } preflow_handler(desc); handle_irq_event(desc); -out: + +out_eoi: desc->irq_data.chip->irq_eoi(&desc->irq_data); +out_unlock: raw_spin_unlock(&desc->lock); + return; +out: + if (!(desc->irq_data.chip->flags & IRQCHIP_EOI_IF_HANDLED)) + goto out_eoi; + goto out_unlock; } /**