From 687127db08cb3a02f5aaa3b107abe53d9db5aed4 Mon Sep 17 00:00:00 2001
From: Sebastian Andrzej Siewior <bigeasy@linutronix.de>
Date: Fri, 11 Feb 2022 19:14:54 +0100
Subject: [PATCH 159/166] genirq: Provide generic_handle_irq_safe().

Provide generic_handle_irq_safe() which can used from any context.

Suggested-by: Thomas Gleixner <tglx@linutronix.de>
Signed-off-by: Sebastian Andrzej Siewior <bigeasy@linutronix.de>
Reviewed-by: Hans de Goede <hdegoede@redhat.com>
Reviewed-by: Oleksandr Natalenko <oleksandr@natalenko.name>
Reviewed-by: Wolfram Sang <wsa+renesas@sang-engineering.com>
Link: https://lore.kernel.org/r/20220211181500.1856198-2-bigeasy@linutronix.de
(cherry picked from commit ac9c70a245d28b67db09c1fb45696ab04b4f5b72)
Signed-off-by: Clark Williams <williams@redhat.com>
---
 include/linux/irqdesc.h |    1 +
 kernel/irq/irqdesc.c    |   23 +++++++++++++++++++++++
 2 files changed, 24 insertions(+)

Index: linux-5.15.32-rt39/include/linux/irqdesc.h
===================================================================
@ linux-5.15.32-rt39/include/linux/irqdesc.h:163 @ static inline void generic_handle_irq_de
 
 int handle_irq_desc(struct irq_desc *desc);
 int generic_handle_irq(unsigned int irq);
+int generic_handle_irq_safe(unsigned int irq);
 
 #ifdef CONFIG_IRQ_DOMAIN
 /*
Index: linux-5.15.32-rt39/kernel/irq/irqdesc.c
===================================================================
--- linux-5.15.32-rt39.orig/kernel/irq/irqdesc.c
+++ linux-5.15.32-rt39/kernel/irq/irqdesc.c
@ linux-5.15.32-rt39/include/linux/irqdesc.h:664 @ int generic_handle_irq(unsigned int irq)
 }
 EXPORT_SYMBOL_GPL(generic_handle_irq);
 
+/**
+ * generic_handle_irq_safe - Invoke the handler for a particular irq from any
+ *			     context.
+ * @irq:	The irq number to handle
+ *
+ * Returns:	0 on success, a negative value on error.
+ *
+ * This function can be called from any context (IRQ or process context). It
+ * will report an error if not invoked from IRQ context and the irq has been
+ * marked to enforce IRQ-context only.
+ */
+int generic_handle_irq_safe(unsigned int irq)
+{
+	unsigned long flags;
+	int ret;
+
+	local_irq_save(flags);
+	ret = handle_irq_desc(irq_to_desc(irq));
+	local_irq_restore(flags);
+	return ret;
+}
+EXPORT_SYMBOL_GPL(generic_handle_irq_safe);
+
 #ifdef CONFIG_IRQ_DOMAIN
 /**
  * generic_handle_domain_irq - Invoke the handler for a HW irq belonging