firmware: arm_scmi: Ensure drivers provide a probe function
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. Link: https://lore.kernel.org/r/20210624095059.4010157-2-sudeep.holla@arm.com Fixes: 933c5044 ("firmware: arm_scmi: add scmi protocol bus to enumerate protocol devices") Reported-by:Uwe Kleine-König <u.kleine-koenig@pengutronix.de> Tested-by:
Cristian Marussi <cristian.marussi@arm.com> Reviewed-by:
Cristian Marussi <cristian.marussi@arm.com> Acked-by:
Uwe Kleine-König <u.kleine-koenig@pengutronix.de> Signed-off-by:
Sudeep Holla <sudeep.holla@arm.com>
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