openwrt/target/linux/bcm27xx/patches-5.4/950-0092-ARM-Activate-FIQs-to-avoid-__irq_startup-warnings.patch

From a32b114d39a51c28eb22f742a6f66d71aa8915fa Mon Sep 17 00:00:00 2001
From: Phil Elwell <phil@raspberrypi.org>
Date: Mon, 11 Dec 2017 09:18:32 +0000
Subject: [PATCH] ARM: Activate FIQs to avoid __irq_startup warnings

There is a new test in __irq_startup that the IRQ is activated, which
hasn't been the case for FIQs since they bypass some of the usual setup.

Augment enable_fiq to include a call to irq_activate to avoid the
warning.

Signed-off-by: Phil Elwell <phil@raspberrypi.org>
---
 arch/arm/kernel/fiq.c | 4 ++++
 1 file changed, 4 insertions(+)

--- a/arch/arm/kernel/fiq.c
+++ b/arch/arm/kernel/fiq.c
@@ -56,6 +56,8 @@
 static unsigned long dfl_fiq_insn;
 static struct pt_regs dfl_fiq_regs;
 
+extern int irq_activate(struct irq_desc *desc);
+
 /* Default reacquire function
  * - we always relinquish FIQ control
  * - we always reacquire FIQ control
@@ -140,6 +142,8 @@ static int fiq_start;
 
 void enable_fiq(int fiq)
 {
+	struct irq_desc *desc = irq_to_desc(fiq + fiq_start);
+	irq_activate(desc);
 	enable_irq(fiq + fiq_start);
 }