ULPI registers it's bus at module_init so if the bus fails to register, the module will fail to load and all will be well in the world. However, if the ULPI code is built-in rather than a module, the bus initialization may fail but we'd still try to register drivers later onto a non-existant bus, which will panic the kernel. Fix that by checking that the bus was indeed initialized before trying to register drivers on top of it. Signed-off-by: Sasha Levin <sasha.levin@xxxxxxxxxx> --- drivers/usb/common/ulpi.c | 4 ++++ 1 file changed, 4 insertions(+) diff --git a/drivers/usb/common/ulpi.c b/drivers/usb/common/ulpi.c index 0e6f968..0b0a5e7 100644 --- a/drivers/usb/common/ulpi.c +++ b/drivers/usb/common/ulpi.c @@ -132,6 +132,10 @@ int ulpi_register_driver(struct ulpi_driver *drv) if (!drv->probe) return -EINVAL; + /* Was the bus registered successfully? */ + if (!ulpi_bus.p) + return -ENODEV; + drv->driver.bus = &ulpi_bus; return driver_register(&drv->driver); -- 1.7.10.4 -- To unsubscribe from this list: send the line "unsubscribe linux-usb" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
