linux-kernel - [PATCH] [62/99] xen: Use IRQF_FORCE

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Message-Id: <20110727214901.6D0012403FF@tassilo.jf.intel.com>
Date:	Wed, 27 Jul 2011 14:49:01 -0700 (PDT)
From:	Andi Kleen <andi@...stfloor.org>
To:	tglx@...utronix.de, konrad.wilk@...cle.com,
	stefan.bader@...onical.com, gregkh@...e.de, ak@...ux.intel.com,
	linux-kernel@...r.kernel.org, stable@...nel.org,
	tim.bird@...sony.com
Subject: [PATCH] [62/99] xen: Use IRQF_FORCE_RESUME

2.6.35-longterm review patch.  If anyone has any objections, please let me know.

------------------
From: Thomas Gleixner <tglx@...utronix.de>

commit 676dc3cf5bc36a9e129a3ad8fe3bd7b2ebf20f5d upstream.

Mark the IRQF_NO_SUSPEND interrupts IRQF_FORCE_RESUME and remove the extra
walk through the interrupt descriptors.

Signed-off-by: Thomas Gleixner <tglx@...utronix.de>
Signed-off-by: Konrad Rzeszutek Wilk <konrad.wilk@...cle.com>
Signed-off-by: Stefan Bader <stefan.bader@...onical.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@...e.de>
Signed-off-by: Andi Kleen <ak@...ux.intel.com>

---
 drivers/xen/events.c |   20 +-------------------
 1 file changed, 1 insertion(+), 19 deletions(-)

Index: linux-2.6.35.y/drivers/xen/events.c
===================================================================
--- linux-2.6.35.y.orig/drivers/xen/events.c
+++ linux-2.6.35.y/drivers/xen/events.c
@@ -537,7 +537,7 @@ int bind_ipi_to_irqhandler(enum ipi_vect
 	if (irq < 0)
 		return irq;
 
-	irqflags |= IRQF_NO_SUSPEND;
+	irqflags |= IRQF_NO_SUSPEND | IRQF_FORCE_RESUME;
 	retval = request_irq(irq, handler, irqflags, devname, dev_id);
 	if (retval != 0) {
 		unbind_from_irq(irq);
@@ -896,7 +896,6 @@ void xen_poll_irq(int irq)
 void xen_irq_resume(void)
 {
 	unsigned int cpu, irq, evtchn;
-	struct irq_desc *desc;
 
 	init_evtchn_cpu_bindings();
 
@@ -915,23 +914,6 @@ void xen_irq_resume(void)
 		restore_cpu_virqs(cpu);
 		restore_cpu_ipis(cpu);
 	}
-
-	/*
-	 * Unmask any IRQF_NO_SUSPEND IRQs which are enabled. These
-	 * are not handled by the IRQ core.
-	 */
-	for_each_irq_desc(irq, desc) {
-		if (!desc->action || !(desc->action->flags & IRQF_NO_SUSPEND))
-			continue;
-		if (desc->status & IRQ_DISABLED)
-			continue;
-
-		evtchn = evtchn_from_irq(irq);
-		if (evtchn == -1)
-			continue;
-
-		unmask_evtchn(evtchn);
-	}
 }
 
 static struct irq_chip xen_dynamic_chip __read_mostly = {
--
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