genirq/irq_sim: Check the return value of irq_sim_init() for error codes

As discussed with Marc Zyngier: irq_sim_init() and its devres variant
should return the base of the allocated interrupt range on success rather
than 0.

Make devm_irq_sim_init() check for an error code. This is a preparatory
change for modifying irq_sim_init() itself.

Signed-off-by: Bartosz Golaszewski <brgl@bgdev.pl>
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Cc: Marc Zyngier <marc.zyngier@arm.com>
Link: https://lkml.kernel.org/r/20180304121018.640-3-brgl@bgdev.pl

diff --git a/kernel/irq/irq_sim.c b/kernel/irq/irq_sim.c
index bd7dc1db6a804380d53797eaa7c3ed052cc0df66..05f0d7c1698acb56ae808c4e59bd6ba2302ef111 100644 (file)
--- a/kernel/irq/irq_sim.c
+++ b/kernel/irq/irq_sim.c
@@ -124,7 +124,7 @@ int devm_irq_sim_init(struct device *dev, struct irq_sim *sim,
                return -ENOMEM;
 
        rv = irq_sim_init(sim, num_irqs);
-       if (rv) {
+       if (rv < 0) {
                devres_free(dr);
                return rv;
        }