[PATCH v2 07/10] soc: fsl: qe: Handle spurious interrupts

[Paul Louvel <paul.louvel@bootlin.com>]

When no interrupt bits are set in the event register, call
handle_bad_irq() to account for the spurious interrupt before
exiting the cascade handler.

Signed-off-by: Paul Louvel <paul.louvel@bootlin.com>
---
 drivers/soc/fsl/qe/qe_ports_ic.c | 6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/drivers/soc/fsl/qe/qe_ports_ic.c b/drivers/soc/fsl/qe/qe_ports_ic.c
index bc8b68e5d1a9..29f4334db5a0 100644
--- a/drivers/soc/fsl/qe/qe_ports_ic.c
+++ b/drivers/soc/fsl/qe/qe_ports_ic.c
@@ -80,9 +80,15 @@ static void qepic_cascade(struct irq_desc *desc)
 	chained_irq_enter(chip, desc);
 
 	event = ioread32be(data->reg + CEPIER);
+	if (!event) {
+		handle_bad_irq(desc);
+		goto out;
+	}
+
 	for_each_set_bit(bit, &event, 32)
 		generic_handle_domain_irq(data->host, 31 - bit);
 
+out:
 	chained_irq_exit(chip, desc);
 }
 

-- 
2.55.0