genirq-Cleanup-forced-threading-bits-when-handler-th.patch

From 95c6a403c768aa2de401266506c95b57aea9230e Mon Sep 17 00:00:00 2001
From: Thomas Gleixner <tglx@linutronix.de>
Date: Wed, 12 Aug 2009 18:32:08 +0200
Subject: [PATCH] genirq: Cleanup forced threading bits when handler thread terminates

commit b46fe5710dee18042a0f333e3709cd7af79acd97 in tip.

When a handler thread terminates then the forced_thread_active bit
might be still set. Cleanup and unmask the interrupt if this is the
last thread which blocked the unmask.

Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Signed-off-by: Paul Gortmaker <paul.gortmaker@windriver.com>
---
 kernel/irq/manage.c |    9 +++++++++
 1 files changed, 9 insertions(+), 0 deletions(-)

diff --git a/kernel/irq/manage.c b/kernel/irq/manage.c
index 8fb33fe..c6e4830 100644
--- a/kernel/irq/manage.c
+++ b/kernel/irq/manage.c
@@ -539,6 +539,13 @@ again:
 	return 0;
 }
 
+static inline void
+preempt_hardirq_cleanup(struct irq_desc *desc, struct irqaction *action)
+{
+	clear_bit(IRQTF_RUNTHREAD, &action->thread_flags);
+	preempt_hardirq_thread_done(desc, action);
+}
+
 static int
 irq_wait_for_interrupt(struct irq_desc *desc, struct irqaction *action)
 {
@@ -669,6 +676,8 @@ static int irq_thread(void *data)
 			wake_up(&desc->wait_for_threads);
 	}
 
+	preempt_hardirq_cleanup(desc, action);
+
 	/*
 	 * Clear irqaction. Otherwise exit_irq_thread() would make
 	 * fuzz about an active irq thread going into nirvana.
-- 
1.7.0.4