[PATCH 1/2] firmware: arm_ffa: Ensure drivers provide a probe function

[Uwe Kleine-König]

The bus probe callback calls the driver callback without further
checking. Better be safe than sorry and refuse registration of a driver
without a probe function to prevent a NULL pointer exception.

Fixes: e781858488b9 ("firmware: arm_ffa: Add initial FFA bus support for device enumeration")
Signed-off-by: Uwe Kleine-König <u.kleine-koenig at pengutronix.de>
---
 drivers/firmware/arm_ffa/bus.c | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/drivers/firmware/arm_ffa/bus.c b/drivers/firmware/arm_ffa/bus.c
index 83166e02b191..d2cc24319626 100644
--- a/drivers/firmware/arm_ffa/bus.c
+++ b/drivers/firmware/arm_ffa/bus.c
@@ -99,6 +99,9 @@ int ffa_driver_register(struct ffa_driver *driver, struct module *owner,
 {
 	int ret;
 
+	if (!driver->probe)
+		return -EINVAL;
+
 	driver->driver.bus = &ffa_bus_type;
 	driver->driver.name = driver->name;
 	driver->driver.owner = owner;
-- 
2.30.2