From: Kevin Hilman <khilman@mvista.com>
Date: Tue, 18 Dec 2007 17:05:58 +0000 (+0100)
Subject: genirq: add unlocked version of set_irq_handler()
X-Git-Url: https://git.stricted.de/?a=commitdiff_plain;h=b019e57321f3e006c0ec7a54f13efc377bcb6451;p=GitHub%2Fexynos8895%2Fandroid_kernel_samsung_universal8895.git

genirq: 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@mvista.com>
Signed-off-by: Ingo Molnar <mingo@elte.hu>
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
---

diff --git a/include/linux/irq.h b/include/linux/irq.h
index efc88538b2ba..4669be080617 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:
  */