Commit 77694b40 authored by Thomas Gleixner's avatar Thomas Gleixner
Browse files

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: default avatarThomas Gleixner <tglx@linutronix.de>
parent 78129576

include/linux/irq.h

+3 −1
Original line number Diff line number Diff line
@@ -329,9 +329,11 @@ struct irq_chip { 
 * irq_chip specific flags

 *

 * 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 */

kernel/irq/chip.c

+8 −1
Original line number Diff line number Diff line
@@ -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;

}



/**