irqchip: crossbar: Return proper error value

crossbar_of_init always returns -ENOMEM in case of errors.
There can be other causes of failure like invalid data from
DT. So return a appropriate error value for that case.

Signed-off-by: Nishanth Menon <nm@ti.com>
Signed-off-by: Sricharan R <r.sricharan@ti.com>
Acked-by: Santosh Shilimkar <santosh.shilimkar@ti.com>
Link: https://lkml.kernel.org/r/1403766634-18543-10-git-send-email-r.sricharan@ti.com
Signed-off-by: Jason Cooper <jason@lakedaemon.net>

diff --git a/drivers/irqchip/irq-crossbar.c b/drivers/irqchip/irq-crossbar.c
index cee556bf603c80c5a185b30d7076ec1afd263efe..10d723dfa34852e3f643e304d94fc5e1700c10a1 100644 (file)
--- a/drivers/irqchip/irq-crossbar.c
+++ b/drivers/irqchip/irq-crossbar.c
@@ -129,19 +129,25 @@ static const struct irq_domain_ops routable_irq_domain_ops = {
 
 static int __init crossbar_of_init(struct device_node *node)
 {
-       int i, size, max, reserved = 0, entry;
+       int i, size, max = 0, reserved = 0, entry;
        const __be32 *irqsr;
+       int ret = -ENOMEM;
 
        cb = kzalloc(sizeof(*cb), GFP_KERNEL);
 
        if (!cb)
-               return -ENOMEM;
+               return ret;
 
        cb->crossbar_base = of_iomap(node, 0);
        if (!cb->crossbar_base)
                goto err1;
 
        of_property_read_u32(node, "ti,max-irqs", &max);
+       if (!max) {
+               pr_err("missing 'ti,max-irqs' property\n");
+               ret = -EINVAL;
+               goto err2;
+       }
        cb->irq_map = kcalloc(max, sizeof(int), GFP_KERNEL);
        if (!cb->irq_map)
                goto err2;
@@ -162,6 +168,7 @@ static int __init crossbar_of_init(struct device_node *node)
                                                   i, &entry);
                        if (entry > max) {
                                pr_err("Invalid reserved entry\n");
+                               ret = -EINVAL;
                                goto err3;
                        }
                        cb->irq_map[entry] = IRQ_RESERVED;
@@ -205,6 +212,7 @@ static int __init crossbar_of_init(struct device_node *node)
                break;
        default:
                pr_err("Invalid reg-size property\n");
+               ret = -EINVAL;
                goto err4;
                break;
        }
@@ -243,7 +251,7 @@ err2:
        iounmap(cb->crossbar_base);
 err1:
        kfree(cb);
-       return -ENOMEM;
+       return ret;
 }
 
 static const struct of_device_id crossbar_match[] __initconst = {