genirq: Introduce request_any_context_irq()

[firefly-linux-kernel-4.4.55.git] / kernel / irq / manage.c

diff --git a/kernel/irq/manage.c b/kernel/irq/manage.c
index 704e488730a517e12a138bba8286bb856c99f369..84f32278ff1f089e60703f45dc3ffb1fbd86ce67 100644 (file)
--- a/kernel/irq/manage.c
+++ b/kernel/irq/manage.c
@@ -1120,3 +1120,40 @@ int request_threaded_irq(unsigned int irq, irq_handler_t handler,
        return retval;
 }
 EXPORT_SYMBOL(request_threaded_irq);
+
+/**
+ *     request_any_context_irq - allocate an interrupt line
+ *     @irq: Interrupt line to allocate
+ *     @handler: Function to be called when the IRQ occurs.
+ *               Threaded handler for threaded interrupts.
+ *     @flags: Interrupt type flags
+ *     @name: An ascii name for the claiming device
+ *     @dev_id: A cookie passed back to the handler function
+ *
+ *     This call allocates interrupt resources and enables the
+ *     interrupt line and IRQ handling. It selects either a
+ *     hardirq or threaded handling method depending on the
+ *     context.
+ *
+ *     On failure, it returns a negative value. On success,
+ *     it returns either IRQC_IS_HARDIRQ or IRQC_IS_NESTED.
+ */
+int request_any_context_irq(unsigned int irq, irq_handler_t handler,
+                           unsigned long flags, const char *name, void *dev_id)
+{
+       struct irq_desc *desc = irq_to_desc(irq);
+       int ret;
+
+       if (!desc)
+               return -EINVAL;
+
+       if (desc->status & IRQ_NESTED_THREAD) {
+               ret = request_threaded_irq(irq, NULL, handler,
+                                          flags, name, dev_id);
+               return !ret ? IRQC_IS_NESTED : ret;
+       }
+
+       ret = request_irq(irq, handler, flags, name, dev_id);
+       return !ret ? IRQC_IS_HARDIRQ : ret;
+}
+EXPORT_SYMBOL_GPL(request_any_context_irq);