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Commit dc5f219e authored by Thomas Gleixner's avatar Thomas Gleixner
Browse files

genirq: Add IRQF_FORCE_RESUME 



Xen needs to reenable interrupts which are marked IRQF_NO_SUSPEND in the
resume path. Add a flag to force the reenabling in the resume code.

Tested-and-acked-by: default avatarIan Campbell <Ian.Campbell@eu.citrix.com>
Signed-off-by: default avatarThomas Gleixner <tglx@linutronix.de>
parent 100b33c8

include/linux/interrupt.h

+2 −1
Original line number Diff line number Diff line
@@ -55,7 +55,7 @@ 
 *                Used by threaded interrupts which need to keep the

 *                irq line disabled until the threaded handler has been run.

 * IRQF_NO_SUSPEND - Do not disable this IRQ during suspend

 *

 * IRQF_FORCE_RESUME - Force enable it on resume even if IRQF_NO_SUSPEND is set

 */

#define IRQF_DISABLED		0x00000020

#define IRQF_SAMPLE_RANDOM	0x00000040
@@ -67,6 +67,7 @@ 
#define IRQF_IRQPOLL		0x00001000

#define IRQF_ONESHOT		0x00002000

#define IRQF_NO_SUSPEND		0x00004000

#define IRQF_FORCE_RESUME	0x00008000



#define IRQF_TIMER		(__IRQF_TIMER | IRQF_NO_SUSPEND)

kernel/irq/manage.c

+10 −1
Original line number Diff line number Diff line
@@ -282,8 +282,17 @@ EXPORT_SYMBOL(disable_irq); 


void __enable_irq(struct irq_desc *desc, unsigned int irq, bool resume)

{

	if (resume)

	if (resume) {

		if (!(desc->status & IRQ_SUSPENDED)) {

			if (!desc->action)

				return;

			if (!(desc->action->flags & IRQF_FORCE_RESUME))

				return;

			/* Pretend that it got disabled ! */

			desc->depth++;

		}

		desc->status &= ~IRQ_SUSPENDED;

	}



	switch (desc->depth) {

	case 0:

kernel/irq/pm.c

+0 −3
Original line number Diff line number Diff line
@@ -53,9 +53,6 @@ void resume_device_irqs(void) 
	for_each_irq_desc(irq, desc) {

		unsigned long flags;



		if (!(desc->status & IRQ_SUSPENDED))

			continue;



		raw_spin_lock_irqsave(&desc->lock, flags);

		__enable_irq(desc, irq, true);

		raw_spin_unlock_irqrestore(&desc->lock, flags);