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firmware: arm_ffa: 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/20210621201652.127611-1-u.kleine-koenig@pengutronix.de
Fixes: e781858488 ("firmware: arm_ffa: Add initial FFA bus support for device enumeration")
Signed-off-by: Uwe Kleine-König <u.kleine-koenig@pengutronix.de>
Signed-off-by: Sudeep Holla <sudeep.holla@arm.com>
This commit is contained in:
Uwe Kleine-König 2021-06-21 22:16:51 +02:00 committed by Sudeep Holla
parent e73f0f0ee7
commit 9274307146
1 changed files with 3 additions and 0 deletions
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3
drivers/firmware/arm_ffa/bus.c
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@ -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;