linux-kernel - [PATCH] Generic IRQ: Add unlocked version of set_irq

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Message-Id: <1197413651-23076-1-git-send-email-khilman@mvista.com>
Date:	Tue, 11 Dec 2007 14:54:11 -0800
From:	Kevin Hilman <khilman@...sta.com>
To:	linux-kernel@...r.kernel.org
Cc:	Thomas Gleixner <tglx@...utronix.de>, Ingo Molnar <mingo@...e.hu>,
	Kevin Hilman <khilman@...sta.com>
Subject: [PATCH] Generic IRQ: Add unlocked version of set_irq_handler()

Add unlocked version for use by irq_chip.set_type handlers which may
wish to change handler to level or edge handler when IRQ type is
changed.

The normal set_irq_handler() call cannot be used because it tries to
take irq_desc.lock which is already held when the irq_chip.set_type
hook is called.

Signed-off-by: Kevin Hilman <khilman@...sta.com>
---
 include/linux/irq.h |    7 +++++++
 1 files changed, 7 insertions(+), 0 deletions(-)

diff --git a/include/linux/irq.h b/include/linux/irq.h
index efc8853..4669be0 100644
--- a/include/linux/irq.h
+++ b/include/linux/irq.h
@@ -339,6 +339,13 @@ extern void
 __set_irq_handler(unsigned int irq, irq_flow_handler_t handle, int is_chained,
 		  const char *name);
 
+/* caller has locked the irq_desc and both params are valid */
+static inline void __set_irq_handler_unlocked(int irq,
+					      irq_flow_handler_t handler)
+{
+	irq_desc[irq].handle_irq = handler;
+}
+
 /*
  * Set a highlevel flow handler for a given IRQ:
  */
-- 
1.5.3.7

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