linux-kernel - [PATCH] genirq: Call chip_bus_lock()/chip_bus_sync_unlock() in setup

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Message-Id: <1297296265-18680-1-git-send-email-ddaney@caviumnetworks.com>
Date:	Wed,  9 Feb 2011 16:04:25 -0800
From:	David Daney <ddaney@...iumnetworks.com>
To:	tglx@...utronix.de
Cc:	linux-kernel@...r.kernel.org,
	David Daney <ddaney@...iumnetworks.com>
Subject: [PATCH] genirq: Call chip_bus_lock()/chip_bus_sync_unlock() in setup_irq().

irq_chips that supply .irq_bus_lock/.irq_bus_sync_unlock functions,
expect that the other chip methods will be called inside of calls to
the pair.  If this expectation is not met, things tend to not work.

Make setup_irq() call chip_bus_lock()/chip_bus_sync_unlock() too.

For the vast majority of irq_chips, this will be a NOP as most don't
have these bus lock functions.

Signed-off-by: David Daney <ddaney@...iumnetworks.com>
---
 kernel/irq/manage.c |    7 ++++++-
 1 files changed, 6 insertions(+), 1 deletions(-)

diff --git a/kernel/irq/manage.c b/kernel/irq/manage.c
index 0caa59f..a00bf2c 100644
--- a/kernel/irq/manage.c
+++ b/kernel/irq/manage.c
@@ -871,9 +871,14 @@ out_thread:
  */
 int setup_irq(unsigned int irq, struct irqaction *act)
 {
+	int retval;
 	struct irq_desc *desc = irq_to_desc(irq);
 
-	return __setup_irq(irq, desc, act);
+	chip_bus_lock(desc);
+	retval = __setup_irq(irq, desc, act);
+	chip_bus_sync_unlock(desc);
+
+	return retval;
 }
 EXPORT_SYMBOL_GPL(setup_irq);
 
-- 
1.7.2.3

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