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 <tglx@linutronix.de>
diff --git a/include/linux/irq.h b/include/linux/irq.h
index 3639097..ea2970c 100644
--- a/include/linux/irq.h
+++ b/include/linux/irq.h
@@ -328,10 +328,12 @@
/*
* 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 08be5d1..1d3e25e 100644
--- a/kernel/irq/chip.c
+++ b/kernel/irq/chip.c
@@ -515,9 +515,16 @@
}
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;
}
/**