[PATCH] ARM: Allow register_undef_hook to be called with IRQs off

Preserve the interrupt status across a call to register_undef_hook.
This allows it to be called while interrupts are disabled.

Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>

1 files changed, 8 insertions, 4 deletions

diff --git a/arch/arm/kernel/traps.c b/arch/arm/kernel/traps.c
index df2cb06ce424..d571c37ac30c 100644
--- a/arch/arm/kernel/traps.c
+++ b/arch/arm/kernel/traps.c
@@ -248,16 +248,20 @@ static DEFINE_SPINLOCK(undef_lock);
 
 void register_undef_hook(struct undef_hook *hook)
 {
-        spin_lock_irq(&undef_lock);
+        unsigned long flags;
+
+        spin_lock_irqsave(&undef_lock, flags);
         list_add(&hook->node, &undef_hook);
-        spin_unlock_irq(&undef_lock);
+        spin_unlock_irqrestore(&undef_lock, flags);
 }
 
 void unregister_undef_hook(struct undef_hook *hook)
 {
-        spin_lock_irq(&undef_lock);
+        unsigned long flags;
+
+        spin_lock_irqsave(&undef_lock, flags);
         list_del(&hook->node);
-        spin_unlock_irq(&undef_lock);
+        spin_unlock_irqrestore(&undef_lock, flags);
 }
 
 asmlinkage void do_undefinstr(struct pt_regs *regs)