[PATCH 2/2] mailbox: qcom-ipcc: amend qcom_ipcc_irq_fn() to report errors

[Gabriele Paoloni <gpaoloni@redhat.com>]

check the virq value returned by irq_find_mapping(), also
check the return value of generic_handle_irq(); return IRQ_NONE
if either of the checks fails.

Signed-off-by: Gabriele Paoloni <gpaoloni@redhat.com>
---
 drivers/mailbox/qcom-ipcc.c | 10 ++++++++--
 1 file changed, 8 insertions(+), 2 deletions(-)

diff --git a/drivers/mailbox/qcom-ipcc.c b/drivers/mailbox/qcom-ipcc.c
index c23efaaa64a1..0795184591f0 100644
--- a/drivers/mailbox/qcom-ipcc.c
+++ b/drivers/mailbox/qcom-ipcc.c
@@ -75,7 +75,7 @@ static irqreturn_t qcom_ipcc_irq_fn(int irq, void *data)
 {
 	struct qcom_ipcc *ipcc = data;
 	u32 hwirq;
-	int virq;
+	int virq, ret;
 
 	for (;;) {
 		hwirq = readl(ipcc->base + IPCC_REG_RECV_ID);
@@ -83,8 +83,14 @@ static irqreturn_t qcom_ipcc_irq_fn(int irq, void *data)
 			break;
 
 		virq = irq_find_mapping(ipcc->irq_domain, hwirq);
+		if (unlikely(!virq))
+			return IRQ_NONE;
+
 		writel(hwirq, ipcc->base + IPCC_REG_RECV_SIGNAL_CLEAR);
-		generic_handle_irq(virq);
+
+		ret = generic_handle_irq(virq);
+		if (unlikely(ret))
+			return IRQ_NONE;
 	}
 
 	return IRQ_HANDLED;
-- 
2.48.1