[PATCH] genirq: fix irq flow handler uninstall

[Thomas Gleixner]

The sanity check for no_irq_chip in __set_irq_hander() is unconditional
on both install and uninstall of an handler. This triggers false
warnings and replaces no_irq_chip by dummy_irq_chip in the uninstall
case. 

Check only, when a real handler is installed.

Signed-off-by: Thomas Gleixner <tglx@xxxxxxxxxxxxx>

Index: 2.6.19-git19/kernel/irq/chip.c
===================================================================
--- 2.6.19-git19.orig/kernel/irq/chip.c
+++ 2.6.19-git19/kernel/irq/chip.c
@@ -517,8 +517,7 @@ __set_irq_handler(unsigned int irq, irq_
 
 	if (!handle)
 		handle = handle_bad_irq;
-
-	if (desc->chip == &no_irq_chip) {
+	else if (desc->chip == &no_irq_chip) {
 		printk(KERN_WARNING "Trying to install %sinterrupt handler "
 		       "for IRQ%d\n", is_chained ? "chained " : " ", irq);
 		/*


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