[PATCH resend 2/3] Input: synaptics-rmi4 - add dummy F54 attention handler

[Lucas Stach <l.stach@pengutronix.de>]

F54 is IRQ capable, even if it is not used in the current driver
implementation. The common driver code in rmi_create_function_irq always
installs a irq handler for functions that are IRQ capable. Without a
assigned attention handler, this means a NULL pointer being passed as
the nested IRQ handler. This seems to work with some architecture
implementations, but crashes on others like ARM64.

Don't rely on implementation defined behavior and actually install
a proper attention handler.

Fixes: 24d28e4f1271 ("Input: synaptics-rmi4 - convert irq distribution
                      to irq_domain")
Signed-off-by: Lucas Stach <l.stach@pengutronix.de>
---
 drivers/input/rmi4/rmi_f54.c | 6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/drivers/input/rmi4/rmi_f54.c b/drivers/input/rmi4/rmi_f54.c
index 4841354af0d7..22390e89c680 100644
--- a/drivers/input/rmi4/rmi_f54.c
+++ b/drivers/input/rmi4/rmi_f54.c
@@ -732,6 +732,11 @@ static void rmi_f54_remove(struct rmi_function *fn)
 	v4l2_device_unregister(&f54->v4l2);
 }
 
+static irqreturn_t rmi_f54_attention(int irq, void *ctx)
+{
+	return IRQ_HANDLED;
+}
+
 struct rmi_function_handler rmi_f54_handler = {
 	.driver = {
 		.name = F54_NAME,
@@ -740,4 +745,5 @@ struct rmi_function_handler rmi_f54_handler = {
 	.probe = rmi_f54_probe,
 	.config = rmi_f54_config,
 	.remove = rmi_f54_remove,
+	.attention = rmi_f54_attention,
 };
-- 
2.20.1