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From 280129476512b7e18c1ec397383c4badd300e8fc Mon Sep 17 00:00:00 2001
From: Thomas Gleixner <tglx@linutronix.de>
Date: Wed, 26 Aug 2009 16:17:59 +0200
Subject: [PATCH] genirq: Do not mask edge ONESHOT interrupts
commit 7f072a34719f7064189fd40d41f1b98d6bdbf653 in tip.
Edge type oneshot interrupts should not be masked for forced
threading. We might lose interrupts.
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Signed-off-by: Paul Gortmaker <paul.gortmaker@windriver.com>
---
kernel/irq/chip.c | 7 ++++++-
1 files changed, 6 insertions(+), 1 deletions(-)
diff --git a/kernel/irq/chip.c b/kernel/irq/chip.c
index 2c2214d..77403e9 100644
--- a/kernel/irq/chip.c
+++ b/kernel/irq/chip.c
@@ -584,7 +584,12 @@ handle_edge_irq(unsigned int irq, struct irq_desc *desc)
{
raw_spin_lock(&desc->lock);
- desc->status &= ~(IRQ_REPLAY | IRQ_WAITING);
+ /*
+ * Edge irqs can be requested with IRQF_ONESHOT set. RT
+ * (ab)uses this for enforced irq threading, but we do not
+ * want to mask edge type interrupts. Clear the oneshot flag.
+ */
+ desc->status &= ~(IRQ_REPLAY | IRQ_WAITING | IRQ_ONESHOT);
/*
* If we're currently running this IRQ, or its disabled,
--
1.7.0.4
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