From bdeeed098811b36d1f988521600a89a400830a4b Mon Sep 17 00:00:00 2001 From: Finn Thain Date: Wed, 9 May 2018 11:04:48 +1000 Subject: nubus: Call bus_register unconditionally Loading a NuBus driver module on a non-NuBus machine triggers the BUG_ON(!drv->bus->p) in driver_register(), because bus_register() was not called, because it is conditional on MACH_IS_MAC. Fix the crash by calling bus_register() unconditionally. Call it from a postcore_initcall(), like other busses do. Hence, the bus type is available for device_register(), which happens in a subsys initcall, and for driver_register(), which happens in a device or module initcall. Cc: Greg Kroah-Hartman Reported-by: Michael Schmitz Tested-by: Stan Johnson Fixes: 7f86c765a6a2 ("nubus: Add support for the driver model") Signed-off-by: Finn Thain Reviewed-by: Geert Uytterhoeven Signed-off-by: Greg Kroah-Hartman --- drivers/nubus/bus.c | 19 +++++++------------ drivers/nubus/nubus.c | 2 +- include/linux/nubus.h | 2 +- 3 files changed, 9 insertions(+), 14 deletions(-) diff --git a/drivers/nubus/bus.c b/drivers/nubus/bus.c index d306c348c857..a59b6c4bb5b8 100644 --- a/drivers/nubus/bus.c +++ b/drivers/nubus/bus.c @@ -63,20 +63,15 @@ static struct device nubus_parent = { .init_name = "nubus", }; -int __init nubus_bus_register(void) +static int __init nubus_bus_register(void) { - int err; - - err = device_register(&nubus_parent); - if (err) - return err; - - err = bus_register(&nubus_bus_type); - if (!err) - return 0; + return bus_register(&nubus_bus_type); +} +postcore_initcall(nubus_bus_register); - device_unregister(&nubus_parent); - return err; +int __init nubus_parent_device_register(void) +{ + return device_register(&nubus_parent); } static void nubus_device_release(struct device *dev) diff --git a/drivers/nubus/nubus.c b/drivers/nubus/nubus.c index 4621ff98138c..bb0d63a44f41 100644 --- a/drivers/nubus/nubus.c +++ b/drivers/nubus/nubus.c @@ -875,7 +875,7 @@ static int __init nubus_init(void) return 0; nubus_proc_init(); - err = nubus_bus_register(); + err = nubus_parent_device_register(); if (err) return err; nubus_scan_bus(); diff --git a/include/linux/nubus.h b/include/linux/nubus.h index 6e8200215321..eba50b057f6f 100644 --- a/include/linux/nubus.h +++ b/include/linux/nubus.h @@ -163,7 +163,7 @@ void nubus_seq_write_rsrc_mem(struct seq_file *m, unsigned char *nubus_dirptr(const struct nubus_dirent *nd); /* Declarations relating to driver model objects */ -int nubus_bus_register(void); +int nubus_parent_device_register(void); int nubus_device_register(struct nubus_board *board); int nubus_driver_register(struct nubus_driver *ndrv); void nubus_driver_unregister(struct nubus_driver *ndrv); -- cgit v1.2.3-59-g8ed1b