[patch] warn if free_irq() is called from IRQ context

[Ingo Molnar <mingo@elte.hu>]

warn if free_irq() is called in IRQ context - free_irq() can execute
/proc VFS work, which must not be done in IRQ context.

Signed-off-by: Ingo Molnar <mingo@elte.hu>

----

 kernel/irq/manage.c |    1 +
 1 files changed, 1 insertion(+)

Index: linux/kernel/irq/manage.c
===================================================================
--- linux.orig/kernel/irq/manage.c
+++ linux/kernel/irq/manage.c
@@ -263,6 +263,7 @@ void free_irq(unsigned int irq, void *de
 	unsigned long flags;
 	irqreturn_t (*handler)(int, void *, struct pt_regs *) = NULL;
 
+	WARN_ON(in_interrupt());
 	if (irq >= NR_IRQS)
 		return;
 
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