linux-kernel - [PATCH] [61/99] genirq: Add IRQF_FORCE

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Message-Id: <20110727214900.689EA2403FF@tassilo.jf.intel.com>
Date:	Wed, 27 Jul 2011 14:49:00 -0700 (PDT)
From:	Andi Kleen <andi@...stfloor.org>
To:	tglx@...utronix.de, 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] [61/99] genirq: Add 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 dc5f219e88294b93009eef946251251ffffb6d60 upstream.

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: Ian Campbell <Ian.Campbell@...citrix.com>
Signed-off-by: Thomas Gleixner <tglx@...utronix.de>
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>

---
 include/linux/interrupt.h |    3 ++-
 kernel/irq/manage.c       |   11 ++++++++++-
 kernel/irq/pm.c           |    3 ---
 3 files changed, 12 insertions(+), 5 deletions(-)

Index: linux-2.6.35.y/include/linux/interrupt.h
===================================================================
--- linux-2.6.35.y.orig/include/linux/interrupt.h
+++ linux-2.6.35.y/include/linux/interrupt.h
@@ -54,7 +54,7 @@
  *                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
@@ -66,6 +66,7 @@
 #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)
 
Index: linux-2.6.35.y/kernel/irq/manage.c
===================================================================
--- linux-2.6.35.y.orig/kernel/irq/manage.c
+++ linux-2.6.35.y/kernel/irq/manage.c
@@ -281,8 +281,17 @@ 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:
Index: linux-2.6.35.y/kernel/irq/pm.c
===================================================================
--- linux-2.6.35.y.orig/kernel/irq/pm.c
+++ linux-2.6.35.y/kernel/irq/pm.c
@@ -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);
--
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