genirq: Uninline and sanity check generic_handle_irq()
generic_handle_irq() is missing a NULL pointer check for the result of
irq_to_desc. This was a not a big problem, but we want to expose it to
drivers, so we better have sanity checks in place. Add a return value
as well, which indicates that the irq number was valid and the handler
was invoked.
Based on the pure code move from Jonathan Cameron.
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Cc: Jonathan Cameron <jic23@cam.ac.uk>
diff --git a/include/linux/irqdesc.h b/include/linux/irqdesc.h
index c70b1aa..2d921b3 100644
--- a/include/linux/irqdesc.h
+++ b/include/linux/irqdesc.h
@@ -111,10 +111,7 @@
desc->handle_irq(irq, desc);
}
-static inline void generic_handle_irq(unsigned int irq)
-{
- generic_handle_irq_desc(irq, irq_to_desc(irq));
-}
+int generic_handle_irq(unsigned int irq);
/* Test to see if a driver has successfully requested an irq */
static inline int irq_has_action(unsigned int irq)
diff --git a/kernel/irq/irqdesc.c b/kernel/irq/irqdesc.c
index e07b975..9f65b02 100644
--- a/kernel/irq/irqdesc.c
+++ b/kernel/irq/irqdesc.c
@@ -290,6 +290,21 @@
#endif /* !CONFIG_SPARSE_IRQ */
+/**
+ * generic_handle_irq - Invoke the handler for a particular irq
+ * @irq: The irq number to handle
+ *
+ */
+int generic_handle_irq(unsigned int irq)
+{
+ struct irq_desc *desc = irq_to_desc(irq);
+
+ if (!desc)
+ return -EINVAL;
+ generic_handle_irq_desc(irq, desc);
+ return 0;
+}
+
/* Dynamic interrupt handling */
/**
