[PATCH 16/16] irqchip/bcm7120-l2: fix parent IRQ count error handling

[Haofeng Li <920484857@qq.com>]

From: Haofeng Li <lihaofeng@kylinos.cn>

When platform_irq_count() fails or returns zero, probe reported -ENOMEM
even though no memory allocation failed. Negative values such as
-EPROBE_DEFER were also discarded, which breaks deferred probe.

Propagate negative errno from platform_irq_count(), and return -EINVAL
only for a zero parent interrupt count.

Fixes: 3ac268d5ed22 ("irqchip/irq-bcm7120-l2: Switch to IRQCHIP_PLATFORM_DRIVER")
Signed-off-by: Haofeng Li <lihaofeng@kylinos.cn>
---
 drivers/irqchip/irq-bcm7120-l2.c | 8 ++++++--
 1 file changed, 6 insertions(+), 2 deletions(-)

diff --git a/drivers/irqchip/irq-bcm7120-l2.c b/drivers/irqchip/irq-bcm7120-l2.c
index a98f0ee46b6c..9f412c0be6d7 100644
--- a/drivers/irqchip/irq-bcm7120-l2.c
+++ b/drivers/irqchip/irq-bcm7120-l2.c
@@ -225,9 +225,13 @@ static int bcm7120_l2_intc_probe(struct platform_device *pdev, struct device_nod
 		return -ENOMEM;
 
 	data->num_parent_irqs = platform_irq_count(pdev);
-	if (data->num_parent_irqs <= 0) {
+	if (data->num_parent_irqs < 0) {
+		ret = data->num_parent_irqs;
+		goto out_unmap;
+	}
+	if (!data->num_parent_irqs) {
 		pr_err("invalid number of parent interrupts\n");
-		ret = -ENOMEM;
+		ret = -EINVAL;
 		goto out_unmap;
 	}
 
-- 
2.25.1