genirq: Provide generic_handle_irq_safe()

Provide generic_handle_irq_safe() which can used from any context.

Suggested-by: Thomas Gleixner <[email protected]>
Signed-off-by: Sebastian Andrzej Siewior <[email protected]>
Signed-off-by: Thomas Gleixner <[email protected]>
Reviewed-by: Hans de Goede <[email protected]>
Reviewed-by: Oleksandr Natalenko <[email protected]>
Reviewed-by: Wolfram Sang <[email protected]>
Link: https://lore.kernel.org/r/[email protected]
[dereference23: Backport to 4.14]
Signed-off-by: Alexander Winkowski <[email protected]>

include/linux/irqdesc.h

@@ -161,6 +161,7 @@ static inline void generic_handle_irq_desc(struct irq_desc *desc)
 }
 
 int generic_handle_irq(unsigned int irq);
+int generic_handle_irq_safe(unsigned int irq);
 
 #ifdef CONFIG_HANDLE_DOMAIN_IRQ
 /*

kernel/irq/irqdesc.c

@@ -622,6 +622,29 @@ 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 = generic_handle_irq(irq);
+	local_irq_restore(flags);
+	return ret;
+}
+EXPORT_SYMBOL_GPL(generic_handle_irq_safe);
+
 #ifdef CONFIG_HANDLE_DOMAIN_IRQ
 /**
  * __handle_domain_irq - Invoke the handler for a HW irq belonging to a domain