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firmware: arm_scmi: Ensure drivers provide a probe function 

commit 5e469dac326555d2038d199a6329458cc82a34e5 upstream.

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: 933c504424 ("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>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Sudeep Holla 2021-06-24 10:50:59 +01:00 committed by Greg Kroah-Hartman
parent 44f522298c
commit 1b38f70bbc
1 changed files with 3 additions and 0 deletions
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3
drivers/firmware/arm_scmi/bus.c
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@ -100,6 +100,9 @@ int scmi_driver_register(struct scmi_driver *driver, struct module *owner,
{
int retval;
if (!driver->probe)
return -EINVAL;
driver->driver.bus = &scmi_bus_type;
driver->driver.name = driver->name;
driver->driver.owner = owner;