ARM: fix up nested irq regs usage

This should fix up the per-cpu irq register pointer if we have nested
hardware interrupts.

Signed-off-by: Linus Torvalds <torvalds@osdl.org>

diff --git a/arch/arm/kernel/irq.c b/arch/arm/kernel/irq.c
index e999b11..2c4ff1c 100644 (file)
--- a/arch/arm/kernel/irq.c
+++ b/arch/arm/kernel/irq.c
@@ -111,6 +111,7 @@ static struct irq_desc bad_irq_desc = {
  */
 asmlinkage void asm_do_IRQ(unsigned int irq, struct pt_regs *regs)
 {
+       struct pt_regs *old_regs = set_irq_regs(regs);
        struct irqdesc *desc = irq_desc + irq;
 
        /*
@@ -122,13 +123,13 @@ asmlinkage void asm_do_IRQ(unsigned int irq, struct pt_regs *regs)
 
        irq_enter();
 
-       set_irq_regs(regs);
        desc_handle_irq(irq, desc);
 
        /* AT91 specific workaround */
        irq_finish(irq);
 
        irq_exit();
+       set_irq_regs(old_regs);
 }
 
 void set_irq_flags(unsigned int irq, unsigned int iflags)