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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 <gregkh@linuxfoundation.org>
Reported-by: Michael Schmitz <schmitzmic@gmail.com>
Tested-by: Stan Johnson <userm57@yahoo.com>
Fixes: 7f86c765a6 ("nubus: Add support for the driver model")
Signed-off-by: Finn Thain <fthain@telegraphics.com.au>
Reviewed-by: Geert Uytterhoeven <geert@linux-m68k.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
hifive-unleashed-5.1
Finn Thain 2018-05-09 11:04:48 +10:00 committed by Greg Kroah-Hartman
parent 6be5b5b9c5
commit bdeeed0988
3 changed files with 9 additions and 14 deletions
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19
drivers/nubus/bus.c
View File

@ -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;
return bus_register(&nubus_bus_type);
}
postcore_initcall(nubus_bus_register);
err = device_register(&nubus_parent);
if (err)
return err;
err = bus_register(&nubus_bus_type);
if (!err)
return 0;
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)

2
drivers/nubus/nubus.c
View File

@ -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();

2
include/linux/nubus.h
View File

@ -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);