From: Russell King <rmk@dyn-67.arm.linux.org.uk>
Date: Sat, 16 Jul 2005 15:43:33 +0000 (+0100)
Subject: [PATCH] ARM: Allow register_undef_hook to be called with IRQs off
X-Git-Url: https://git.stricted.de/?a=commitdiff_plain;h=109d89ca0ee76138e04b41726b7f719c7df65e88;p=GitHub%2FLineageOS%2Fandroid_kernel_motorola_exynos9610.git

[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>
---

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)