From: Linus Torvalds <torvalds@g5.osdl.org>
Date: Fri, 6 Oct 2006 20:11:15 +0000 (-0700)
Subject: ARM: fix up nested irq regs usage
X-Git-Url: http://git.lede-project.org./?a=commitdiff_plain;h=e630015504cdd4d166c371fec39b8ca258fcbc0e;p=openwrt%2Fstaging%2Fblogic.git

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 e999b11de2c6..2c4ff1cbe334 100644
--- 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)